ZI MSECOLe ve lGe ogr a phyNot e s :Popul a t i ona ndSe t t l e me nt : I nt r oduc t i on Se t t l e me nt Re f e r st oas t r uc t ur ewhe r ehuma nbe i ngsr e s i de . I tma ybema deupofoneors e ve r a ldwe l l i ngs . Thet e r ms e t t l e me nti s ,howe ve r ,c ommonl yus e dt or e f e rt os e ve r a l dwe l l i ngs . I nGe ogr a phywes t udyt hef or m( s ha pe )a ndf unc t i on( pur pos e )of s e t t l e me nt s Si t e t hi si st hes pa c eorpos i t i onoc c upi e dbyas e t t l e me nt . I ti st hel a ndup onwhi c has e t t l e me nti sbui l t . As e t t l e me ntc a nbebui l tuponahi l loront hes l opeofahi l lori na va l l e y. Se t t l e me nt sc a na l s obede s c r i be di nt e r msoft he i rl oc a t i on / s i t ua t i on. Loc a t i on/ s i t ua t i ont hi si st hepos i t i onofas e t t l e me nti nr e l a t i ont o i t ss ur r oundi ngs . Fore xa mpl eas e t t l e me ntc a nbel o c a t e dbe t we e nmount a i ns ,a ta r oa dj unc t i onora l ongac oa s t l i ne . As e t t l e me nt ’ sl oc a t i onc a na l s obede s c r i be di nr e l a t i onwi t ho t he r s e t t l e me nt s . Se t t l e me nt sc a na l s obede s c r i be di nt e r msoft he i rs i z e ,s t r uc t ur e a ndf unc t i on. Se t t l e me nt sc a ngr owf r ombe i ngha ml e t s ,t ovi l l a ge s ,t he nt o t owns ,t oc i t i e sore ve nl a r ge rs e t t l e me nt sknowna sc onur ba t i ons orme ga l opol i s . Ast hevi l l a gegr owsi ns i z et her a ngeofa c t i vi t i e swi t hi ni t i nc r e a s e s . I nat ownat he r ei sas hi f tt onona gr i c ul t ur a la c t i vi t i e st hus di s t i ngui s hi ngi tf r omavi l l a ge . Ur ba ns pr a wl t hi si swhe nt woormor et ownsgr owi nt oe a c hot he r . Ther e s ul tofa nur ba ns pr a wli sc a l l e dac onur ba t i on. As e t t l e me nt ’ ss t r uc t ur ei sknowna si t sl a yout . Thel a youti nc l ude st hes e t t l e me nt ’ st r a ns por tne t wor ka ndl a ndus e . As e t t l e me nt ’ smor phol ogyt hi si swhe r eas e t t l e me nt ’ sl a youti s c ons i de r e di nt e r msofs e t t l e me nt ’ st ype sofbui l di ngs ,t he i rl a y out , a ge ,t ype ,a ndqua l i t y. Ma nys e t t l e me nt sa r ede s c r i be di nt he i rf unc t i ons ,he nc et het e r ms l i kemi ni ngt own,ma r ke t i ngc e nt e re t c . Ea c hs e t t l e me n tha sas phe r eofi nf l ue nc e . Sphe r eofi nf l ue nc e i st hea r e aa r o undt hes e t t l e me ntwhi c hde pe nd ont het ownf orva r i ouss e r vi c e s . Thes phe r eofi nf l ue nc ec a nbede t e r mi ne dl e ngt hoft hej our ne y be t we e nhomea ndwor kpl a c eoft hes e t t l e me nt ’ swor kpl a c e so rt he e xt e ntoft hes e r vi c e sf ore xa mpl ene ws pa pe rdi s t r i but i on. ZI MSECOLe ve lGe ogr a phyNot e s :Popul a t i ona ndSe t t l e me nt :Fa c t or s i nf l ue nc i ngt hes i t i nga ndl oc a t i onofs e t t l e me nt s Se ve r a lf a c t or si nf l ue nc et hel oc a t i onofs e t t l e me nt s The s ec a nbedi vi de di nt of our : hi s t or i c a lf a c t or s a c c e s s i bi l i t y a va i l a bi l i t yofr e s our c e s ;a nd huma npr e f e r e nc e sa n da va i l a bl et e c hnol ogy Hi s t o r i c a lFa c t or s I nc l udehi s t or i c a lc ons i de r a t i onsi n c l udi ngt hede s i r et obui l d s e t t l e me nt sonde f e ns i vegr ounds . Fa c t or sofl e gi s l a t i ona ndl a ndt e nu r ea l s oa f f e c tt hepos i t i onof pr e s e nts e t t l e me ntpa t t e r nsa ndt he i rl oc a t i ons . Fore xa mpl emos ts e t t l e me nt swe r el oc a t e donhi ghe rgr ound whi c hwa se a s i e rt ode f e nd. Hi ghe rgr ounda l s ome a nte ne mi e sc oul dbes e e nwhi l et he ywe r e s t i l lf a rof f . Thi se xpl a i nss e t t l e me nt sl i keGr e a tZi mba bwe ,Kha mia nd Nya ngahi l ls i t e s . I nEur ope a ns e t t l e me nt sr i ve rbe ndsa ndpr onounc e dme a nde r s f or me di mpor t a nts e t t l e me nt sa st he ywe r ef a vor e da sde f e ns i ve s i t e s . Al s oEur ope a ns e t t l e me nt sof t e na l i gnt he ms e l ve swi t ht hea nc i e nt f e uda ls ys t e msofEur ope . Muc hoft hes e t t l e me nti nZi mba bwee s pe c i a l l yi nc ommuna la r e a s a r ehuge l yi nf l ue nc e dbyt heLa ndAppor t i onme ntAc tof1930 . Thel i ne a rs e t t l e me ntpa t t e r nof t e nf oundi nc ommuna la r e a swa sa r e s ul tofpl a nne da ndl e gi s l a t e dl a nds e t t l e me ntpa t t e r ns . Ac c e s s i bi l i t y Thene e dt oc ommuni c a t ewi t hot he ra r e a sf ort r a dea ndt r a ve l pur pos e si sa not he ri mpor t a ntf a c t o rt ha ti nf l ue nc e ss e t t l e me nt pa t t e r ns . Se t t l e me nt sa r eof t e nl oc a t e da l ongt r a ns por tr out e sa nd c ommuni c a t i onl i ne s . The s ema yber oa ds ,r a i l wa yl i ne sorwa t e rr out e s . Suc hs e t t l e me nt sa r ea l s oknowna sNoda ls e t t l e me nt s Noda ls e t t l e me nt s t he s ea r es e t t l e me nt st ha tc onve r gea l ongr o a ds , r a i l wa yl i ne s ,wa t e rr out e s ,mount a i npa s s e s ,ga psr i ve r c onf l ue nc e sa ndva l l e ys . Noda ls e t t l e me nt sa r ehe a vi l yi nf l ue nc e dbyc ommuni c a t i on ne t wor ks . Ava i l a bi l i t yofr e s ou r c e s Hwa ngei smos t l yac oa lt own. Al otofs e t t l e me nt sa r el oc a t e dne a rna t ur a lr e s our c e st ha ta r e ne c e s s a r yf orp e opl e ’ sl i ve l i hood. Fore xa mpl ewa t e r ,mi ne r a l s ,wood,f e r t i l es oi la ndgr a s s . Wa t e ri save r yi mpor t a ntr e s our c et ha ta t t r a c t ss e t t l e me nt . I ti sus e df ordome s t i c / i r r i ga t i onpur pos e s ,pa s t or a la c t i vi t i e sa ndi n s omec a s e swhe r et her i ve ri sna vi g a bl e ,f ort r a ns por tpur pos e s . Se t t l e me nt sa l s ooc c ura l ongs pr i ng s . Se t t l e me nt sc a na l s ooc c ura sar e s ul tofac ombi na t i onoft he s e r e s our c e sf ore xa mpl ewa t e ra ndf e r t i l el a ndsf orf a r mi ngvi l l a ge s a ndt owns . Se t t l e me nt sc a na l s obea t t r a c t e dbyf or e s t sa ndmount a i na r e a s whe r et he r ei spl e nt i f ulwoodt obeus e da saf ue l . Mi ne r a l ss uc ha sa s be s t osha vea c t e da sac a t a l ys tt owa r dst he f or ma t i onoft ownsl i keZvi s ha va nea ndc oa li nHwa nge . Huma npr e f e r e nc e sa ndt hei nf l ue nc eoft e c hnol ogy Mos tba r r i e r st ha tpr e ve nt e ds e t t l e me nt sf r ombe i ngbui l ti nc e r t a i n a r e a sha ves i nc ebe e nove r c ome . Se t t l e me nt sa r enowbe i ngbui l ti na r e a spr e vi ous l yma r gi na l i z e d. Fore xa mpl es e t t l e me nt sa r enowbe i ngbui l te ve nons t e e ps l ope us i ngl a nds c a pi ng. Se t t l e me nt sa r enowbe i ngpl a nne da c c or di ngt ohuma n pr e f e r e nc e sa ndde s i r e s . Fore xa mpl emos tl a ndus epa t t e r n si nr e s e t t l e me nta r e a sa r ea r e s ul tofde l i be r a t ehuma npl a nni ngmor et ha na nyt hi nge l s e . Ur ba na r e as e t t l e me nt sa r ea l wa yspl a nne da l t houghs pont a ne ous s e t t l e me nt s ,wh i c ha r eus ua l l yi l l e ga l ,of t e ns pr outoutf ore xa mpl e Epwor t ha ndHope l yf a r m. ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Cl a s s i f i c a t i onof s e t t l e me nt s Se t t l e me nt sa r ege ne r a l l yc l a s s i f i e da se i t he rr ur a lorur ba n. Rur a ls e t t l e me nt sa r et hos es e t t l e me nt swhe r emos t l ypr i ma r y a c t i vi t i e soc c ur . Thema j or i t yofs e t t l e r si nr ur a la r e a sc a r r youtpr i ma r ya c t i vi t i e si n or de rt oe a r nt h e i rl i vi ng. The s ei nc l udea c t i vi t i e sl i kemi ni n g,f a r mi ng,f i s hi nga ndf or e s t r y. Thepopul a t i onsoft he s es e t t l e me nt sof t e nde pe ndont he s ur r oundi ngl a nd. Ass uc hs e t t l e me nt sgr ow,t he ya l s oi nc r e a s et heva r i e t yof a c t i vi t i e sa ndma yde ve l opi nt our ba ns e t t l e me nt s . Anur ba ns e t t l e me nti sonewhi c hma i nl yc a r r i e souts e c onda r ya nd t e r t i a r yf unc t i ons . Exa mpl e sofs uc hf unc t i onsi nc l udec omme r c e ,ba nki ng, ma nuf a c t ur i nga nds e r vi c epr ovi s i onbus i ne s s e ss uc ha sba nki n g a ndi ns ur a nc e . Ur ba ns e t t l e me nt sc a r r youtawi de rr a nge rofs e r vi c e swhe n c ompa r e dt or ur a ls e t t l e me nt s ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Rur a lSe t t l e me nt si n Zi mba bwe Hi s t or i cs e t t l e me nt swe r er ur a l ,a st hepopul a t i onswe r ema i nl y de pe nde ntonhunt i ng,f i s hi nga ndga t he r i ngf r ui t s . She l t e rwa smos t l yba s i ca ndi nt hef or mofc a ve s ,t e nt sma def r om a ni ma ls ki ns ,hut sma deoutofwoo d,l e a ve sa ndgr a s s . Thede ve l opme ntoff a r mi ngbr oug htwi t hi tt hene e df ormor e pe r ma ne nts e t t l e me nt s . Thes ma l lnuc l e a t e ds e t t l e me nt soft hehunt e r sa ndga t he r e r swe r e t ur ne di nt omor edi s pe r s e ds e t t l e me nt sa st hef a r me r sne e de dmor e r oomf ort he i rf i e l ds ,pa s t ur e sa ndot he rf a r mi ngope r a t i ons . TheAgr a r i a nr e vol ut i onwhi c hoc c ur r e di nEur opei nt he18th c e nt ur ya nds pr e a dt oot he rc ount r i e sl e dt ot hede ve l opme ntof i s ol a t e df a r ms e t t l e me nt s . I nZi mba bwemos tc omme r c i a lf a r msha venuc l e a t e ds e t t l e me nt s a sf a r mi nge . g.t oba c c of a r mi ngt e n dst obel a bouri nt e ns i ve . I nr ur a la r e a se s pe c i a l l yc ommuna ll a ndst hel i ne a rs e t t l e me nt pa t t e r nt e ndst odomi na t e . Thi si sbe c a us epe opl es e t t l ea l ongr i ve r s ,mount a i nr a nge s ,r oa ds , r a i l wa yl i ne se t c . Mos tc ommuna la r e a sa r ea l s oha v et henuc l e a t e ds e t t l e me nt pa t t e r nsa shome sa r eor ga ni z e di nt okr a a l sa ndpe opl es ha r e pa s t ur e sa ndf i e l ds . Ot he rs e t t l e me nta r ea l s oobs e r ve donal e s sf r e que nts c a l e . ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Rur a ls e t t l e me nt pa t t e r ns Li ne a rPa t t e r n Cons i s t sofal i neofhu t sorhous e sf ol l owi ngar oa d,r i ve r ,or c ul t i va t e da r e a s / f i e l ds . Suc hpa t t e r nsc a na l s ode ve l opa l o ngawa t e r s he doramount a i n r a nge . I ts houl dbepoi nt e doutt ha tZi mba bwe ’ sr oa ds ,e s pe c i a l l yt he ma j orr oa ds ,a r ef oundonwa t e r s he ds . Ra di a lPa t t e r n Thi spa t t e r nus ua l l yde ve l opsa tr o a dj unc t i onsornoda lpoi nt s . The yr a di a t eoutf r omac e nt r a lpoi ntl i ket hes poke sofabi c yc l e whe e lgoi ngout wa r dsi na l ldi r e c t i ons . The s enoda lpoi nt si nc l uder ur a ls e r vi c ec e nt e r sf ore xa mpl e Di s t r i c tCounc i lOf f i c e sorGr owt hPoi nt s . Ci r c u l a rpa t t e r n I sac ommonpa t t e r nonde s e r tnoma di cc a mps ,a r ounddwa l a s , vol c a ni chi l l sorwe l l sa ndwa t e r i nghol e si ns e mi a r i da r e a s . Somet r i be se . g .TheKa ya poi nt heAma z onBa s i nl i vei nc i r c ul a r vi l l a ge sf orc ul t ur a lr e a s ons . The yl i vei nt heout e rhous e sa ndt hec e nt r a lhous ei same e t i n g pl a c e . Nuc l e a t e d/ Compa c t Se t t l e me nt si nr ur a la r e a sc a nbenuc l e a t e d/ ga t he r e da r oundma r ke t pl a c e s ,c omme r c i a lf a r mi nga r e a sori nc a mps . Suc hs e t t l e me nt st e ndt obea r r a nge di nmuc ht hes a mema nne ra s e l e c t r onsi na na t om. Di s pe r s e da ndHa pha z a r dSe t t l e me nt spa t t e r ns Se t t l e me nt sc a na l s obedi s pe r s e de s pe c i a l l yi na r e a swi t hf e we r r e s our c e st ha tc a nnots uppor tde ns epopul a t i onsa spe opl et r yt o gi vee a c hot he rs pa c et oope r a t ef ore xa mpl ee xt e ns i vef a r me r s . Thi si sa l s oc ommonp a t t e r ni nc omme r c i a lf a r mi ng,c ommuna l a r e a swi t hr a gge dt e r r a i na nda r e a swi t hpoors oi l s . Ha pha z a r ds e t t l e me ntpa t t e r nsc a nbedi s pe r s e dorc ompa c tbut t he yus ua l l ydonotc onf or mt oar e c ogni z a bl es ha pes howi nga l a c kofpl a nni ng. ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Qua l i t yofl i f ei nr ur a l a r e a si nZi mba bwe Mor er e c e nt l yi nChi a dz waf a mi l i e sha dt ober e s e t t l e da st he i r hous e swe r eondi a mondf i e l ds . Se ve r a lf a mi l i e sha dt ober e s e t t l e da ndc ompe ns a t e dwhe nt he i r vi l l a ge swe r es ubme r ge dbyt her i s i ngwa t e r soft heda m. Thes a medi s r upt i ont o okpl a c ea tt heOs bor neda mwa sbui l ti n Ma ni c a l a nd. Ama s s i ver e s e t t l e me n tpr ogr a mwa sunde r t a ke nt omovet he pe opl et ohi ghe rgr ound. Thec ons t r uc t i onoft heKa r i baDa mi nt he1950ss a wt he di s r upt i onoft h eTongaPe opl ewhowe r es e t t l e d5200s qua r e ki l ome t e r s . TheLa ndHus ba ndr yAc toft he19 50sc r e a t e dapr e domi na nt l y l i ne a rs e t t l e me ntpa t t e r nt ha ts t i l le xi s t st ot hi sda y. Se t t l e me ntpa t t e r nsa r ea l s oi nf l ue n c e dbyphys i c a lr e l i e fa nd t e r r a i na swe l la ss oi lf e r t i l i t y. Thi si sar e s ul tofpa s tl e gi s l a t i ona swe l la sa bouta va i l a bi l i t ya nd a c c e s st or e s our c e sf ore xa mpl ewa t e ra ndl a ndf orc ul t i va t i ona nd pa s t ur e . Mos tofr ur a ls e t t l e me nt st e ndt ob enuc l e a t e dorl i ne a ri n Zi mba bwe . 95%oft her ur a lhous e hol dsus e dwooda st hema i ns our c eoff ue l f orc ooki ng. 52%oft her ur a lhous i nguni t sha dnoa c c e s st oat oi l e tor s a ni t a t i onf a c i l i t i e s . 63%oft her ur a lhous i nguni t sha da c c e s st os a f edr i nki ngwa t e r . 5%ofr ur a lhous i nguni t si nt hec ount r yha de l e c t r i c i t y. 18%oft hec ount r y’ sr ur a lpe opl el i ve di nmode r nhous e s , c ompa r e dt o90%i nur ba na r e a s . 82%oft hec ount r y’ sr ur a lpopul a t i onl i ve si ne i t he rt r a di t i ona l s t r uc t ur e s ,bui l toutofpol ea ndda ggawi t hgr a s st ha t c h,br i c ks wi t hgr a s st ha t c hormi xe ddwe l l i ngswi t honeormor emode r n s t r uc t ur e swi t hc or r uga t e di r ons he e t s ,c e me ntr oof i ngora s be s t os r oof i ng. Ac c or di ngt ot he1992Ce ns us : donotha vea c c e s st os hops ,c l i ni c sors c hool s . l a c kofa c c e s st os a f edr i nki ngwa t e r , i na de qua t es a ni t a t i on, a st hel a c kofa c c e s st opr ope rs a ni t a t i on, Mos toft he s es qua t t e rc a mpsha vepr obl e mss uc h: I nc l udi ngpl a s t i c s ,c a r dboa r ds ,pol e s ,da gga ,gr a s s ,ol di r ons he e t s orwha t e ve rma t e r i a lt hes qua t t e r sc a nl a yt he i rha ndson. The ya r eus ua l l ybui l doutofac ombi na t i onofs e ve r a lbui l di ng ma t e r i a l s The s ea r ee s pe c i a l l yc ommononc omme r c i a lf a r ms ,mi ni ng c e nt r e sa nds omes e r v i c ea r e a se . g. Di s t r i c tCounc i lOf f i c e s . Squa t t e rc a mpsa r ea l s oc ommoni nbot hr ur a la ndur ba na r e a si n Zi mba bwe . Fa i r l ymode r ns e t t l e me nt sbui l tus i ngbr i c ka ndr oof e dwi t h a s be s t os ,c e me nts he e t sorc or r uga t e di r ons he e t sa r ea l s onow c ommoni nmos tr ur a la r e a s . I nf a c te ve ni ff a mi l i e sbui l dot he rhous e sr oundki t c he nsa r eapa r t ofe ve r yr ur a lc ompoundf orc ul t ur a la ndpr a c t i c a lr e a s ons . Loc a lpol e sa ndgr a s sa r es t i l lhowe ve rus e df ort ha t c hi ngt he s e s t r uc t ur e swhi c ha r ea l s ous ua l l yr oundi ns ha pebe t r a yi ngt hef a c t t ha tt he ya r ei nf l ue nc e dbyt hes ha p eoft het r a di t i ona lpol ea nd da ggahut s . Mos tofZi mba bwe ’ sc ommuna ls e t t l e me nt sha vemove da wa y f r omt heus eofpol e sa ndda ggaa ndnowus ef i r e dbr i c ks . Suc ht r a di t i ona lhous e st e nda r es t i l lc ommona l t hought he ya r e s l owl ydi s a ppe a r i nga spe opl ee mb r a c et heus eofbr i c ksa ndot he r mode r nbui l di ngma t e r i a l s . Tr a di t i ona lhous e sa r er oundi ns ha pe ,bui l tofpol e s ,da ggaa nd gr a s s . I nZi mba bwet r a di t i on a lhous e sr e f l e c tt hebui l di ngma t e r i a l s whi c ha r eobt a i ne df r o mt hes ur r ou ndi nge nvi r onme nt . Thequa l i t yofl i f ei nr ur a la r e a si sgr e a t l ya f f e c t e dbyt hequa l i t yof r ur a lhous i ng. Ac c or di ngt ot he2012Ce ns usr e por t67%ofZi mba bwe ’ s popul a t i onl i ve si nr ur a la r e a s . Al s oove rt hepa s tde c a demos tc omme r c i a lf a r msha vebe e n s ubdi vi de di nt oi ndi vi dua lpl ot sa spe opl eobt a i ne dl a ndunde rt he La ndRe f or mAc t . ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Ur ba nSe t t l e me nt s Thes t r uc t ur eofUr ba ns e t t l e me nt s Thi si st hes ha peorf or mofur ba na r e a si nr e l a t i ont ol a ndus e mode l s . Thes t r uc t ur eofur ba ns e t t l e me nt si sa l s oknowna sur ba n mor phol ogy. Mode l sa r eus e dt ode s c r i bea nde xpl a i nt hes t r uc t ur eofc i t i e s . Amode li sas ys t e ma t i cde s c r i pt i onofa nobj e c ti nt hi sc a s ea t ypi c a lc i t y. The r ea r et hr e eur ba nl a ndus emode l svi z : Thec onc e nt r i cmode l( 1924)byBur ge s s TheSe c t orMo de l( 1939)byHoyt TheMul t i nuc l e iMod e l( 1945)byHa r r i sa ndUl l ma n The s emode l sa t t e mptt ode s c r i bewha tat ypi c a lt own/ c i t yorur ba n s e t t l e me ntl ooksl i ke ,howi tc a met obewha ti ti s( howi t de ve l ope dove rt heye a r s )a ndwhy Fa c t o r st ha ta f f e c tl a ndus ei nur ba na r e a s Thepa t t e r nofur ba ngr owt ha ndl a ndus ede pe ndsonanumbe rof f a c t or si nc l udi ng: Communi c a t i o n-Thi si nc l ude sr oa ds ,r a i l wa yl i ne s ,t e l e phone / f i be r l i ne se t c .Fore xa mpl ef a c t or i e st e ndt obel oc a t e da l ong/ ne a r r a i l wa yl i ne sa ndr oa dsf ort he mt or e c e i ver a wma t e r i a l se a s i l y a ndf e r r ygoodst ot hema r ke t .TheCe nt r a lBus i ne s sDi s t r i c t( CBD) i sa tt hec e nt e roft ownsa nde a s i l ya c c e s s i bl ef r oma l ls i de sof t ownhe nc el a ndt e ndst obee xpe ns i vehe r e .Onl yt hos ea c t i vi t i e s t ha tc a npa yf ort hi sl a nda r ef oundi nt heCBDe . g.Ba nks ,Of f i c e s a ndI ns ur a nc ebus i ne s s e s . Thena t ur eoft hel a ndf ore xa mpl ewhe t he ri ti sge nt l ei nt e r msof t e r r a i n. Thec os toft hel a nd.Fore xa mpl ec ompe t i t i onf orl a nda tt heCBD r e s ul t si ns t e e pc os t ss oonl ybus i n e s s e st ha tc a npa yf ort hi sl a nd ourf oundt he r e . Ther e ntorr a t e spa ya bl e .Thi si ss i mi l a rt ot hec os toft hel a nd. Thepos i t i onoft hepl ot si nr e l a t i ont oot he rs e t t l e me nt s . Thes i z eoft hepi e c eofl a nd.Thes ma l l e rt hel a ndt hel a r ge rt h e s i z e . Type sofLa ndus e si nur ba na r e a s La ndus ei . e .wha tt hel a ndi sus e df ori nur ba na r e adi f f e r swi t h e a c ha r e a . Al t houghl a ndus e sa r eus ua l l ymi xe df ore xa mpl es omei ndus t r i e s c a nbef oundi nr e s i de nt i a la r e a sl a ndus e st e ndt obede f i ne d. Si mi l a rl a ndus e sa t t r a c te a c hot he ra ndpus hot he rl a ndus e sout . Fore xa mpl ei fmor ea ndmor ei ndus t r i e sl oc a t ei na r e s i de nt i a la r e amor ea ndmor epe opl ewi l ll e a veduet ot hi ngsl i ke pol l ut i on. Mos ta r e a sha veonedomi na ntl a ndus e . The r ea r edi f f e r e ntt ype sofl a ndus e si nur ba na r e a s . The s ec a nbec l a s s i f i e di nt o: I ndus t r i a l Comme r c i a l Re s i de nt i a l I ns omea r e a st he s el a ndus e sma ymi x. Hi s t o r i c a lde ve l opme nt sofur ba ns e t t l e me nt s Mos tmode r nt ownsi nAf r i c aa ndEur opea r ei nf l ue nc e dby i ndus t r i a l i z a t i o n Asne wf a c t or i e swe r ebui l tl a r genumbe r sofwor ksmi gr a t e df r om r ur a la r e a st ot owns . Thel a r gei nf l uxofpe opl el e dt opr e s s ur eonur ba nl a nda ndt he de ve l opme ntofur ba npl a nni ng. Compe t i t i onf orl a ndi nt heCBDl e dt oar i s ei ni t sc os t ,r e nt a l s a ndr a t e s . Func t i onst ha tc oul dnota f f or dt hi sl a ndwe r epus he doutoft he c i t yc e nt e rt ol e s se xpe ns i veur ba nout s ki r t s . We a l t hyi ndi vi dua l sa l s omove doutoft heCBDt oe s c a pe ove r c r owdi nga nds mokef r omi nd us t r i e st ot hepe r i phe r a la r e a s . The yc oul dbui l dl a r ge rhous e swi t hga r de nsa ndr e c r e a t i ona lpa r ks . Fore xa mpl eBor r owda l e . Lowi nc omea ndune mpl oye dmi gr a t e smove dne a r e rt ot hepl a c e s ofe mpl oyme nta tt hec i t yc e nt e r .Fore xa mpl eAve nue shous e sa nd f l a t sa ndMba r e . Hous i ngs t a ndsbe c a mes ma l l e ra nds ma l l e r . Se mi de t a c he dhous i nga nds qua t t e rc a mpsbe c a meac ommon f e a t ur ei ni nne r c i t yz o ne s . Fore xa mpl eHope l yf a r m. ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Thec onc e nt r i c mode l / Bur ge s s ’ smode l( 1924) Thi si sknowna l t e r na t i ve l ya st hec onc e nt r i cmode l ,t her i ngmode l f orur ba nl a ndus eorBur ge s s ’mode l . I twa sf or mul a t e dbyBur ge s sa ndPa r ki n1924a f t e rt he i rs t udi e s oft hec i t yofChi c a goi nt heUni t e dSt a t e s . The i rs t udyr e ve a l e dt ha tt hec i t yc oul dbedi vi de di nt oanumb e rof c onc e nt r i cl a ndus ez one s: TheCe nt r a lBus i ne s sDi s t r i c t TheZoneoft r a ns i t i on TheZoneoft r a ns i t i on TheZoneofwor ki ngme n’ shous e s TheZoneofmi ddl ei n c omeorme di umde ns i t yhous i ng TheCommut e rZone Themode la s s ume st ha tt hec i t ygr owsf r omas i ngl enuc l e us( c or e ) i nc onc e nt r i cc i r c l e so fdi s t i nc tl a ndus e s . Thec i t ygr owsbyur ba ne c ol ogyore xpa ns i onduet ode ma ndof di f f e r e ntgoodsa nds e r vi c e s . Thec i t ywi l lc ont i nuet ogr owi nt os ur r oundi ngr ur a la r e a s . TheCBD I ti st henuc l e usoft hec i t y Al l( c ommuni c a t i on)r out e sme e ti nt hi sa r e a . I tha shi ghr i s ebui l di ngs / s kys c r a pe r s . Re nt a l sa r enor ma l l yhi ghi nt hi sa r e a . I tha sve r yf e wpe opl ea ndt r a f f i cdur i ngt heni ghta ndhi ght r a f f i c de ns i t i e sofpe opl ea ndt r a f f i cdur i ngt heda y. I ti st hec omme r c i a lc or ewhe r ehot e l s ,ba nks ,s pe c i a l i z e ds e r vi c e s , t he a t e r s ,de pa r t me nt a ls t or e s ,f i na n c ehous e sa ndc i ne ma sa r e f ound. Zoneoft r a ns i t i on I ts ur r oundst heCBD I tha sr e s i de nt i a la r e a swi t hpoorhous i ng. I tha sof f i c e sa ndl i ghti ndus t r i e s . I ti sc ha r a c t e r i z e dbyi ndus t r i a lf un c t i onst ha tr e qui r eal otofl a nd. I ti nf a mousf ori t sc r i me sa nds oc i a lpr obl e msf ore xa mpl e pr os t i t ut i on. I ti sc ha r a c t e r i z e dbyt r a ns i e ntpopul a t i on,mi gr a ntwor ke r s ,t he poor ,a ge da ndune mpl oyme nt . Exa mpl e sa r eMba r ea ndAve nue s . Zoneofwor ki ngme n’ shous e s / Lowc l a s sr e s i de nt i a la r e a s Thi si sknowna st ot hez oneofwo r ki ngme n’ shous e sorl owi nc omer e s i de nt i a lz on e Thi sz onei sf oundne a rhe a vyi ndu s t r i e sf ore xa mpl eHi ghf i e l da nd Gl e nNor a hs ubur bsn e a rWi l l owva l ei ndus t r i e sa ndMba r ea n d Gr a ni t e s i deI ndus t r i e s . Thede ns i t yofhous e spe runi ta r e ai shi gh Thez onei sc ha r a c t e r i z e dbyhi ghd e ns i t ys ubur bswi t he a c hhous e l oc a t e donas ma l lpl otofl a nd. Thi sa r e ai soc c upi e dbyf a c t or ywor ks ,s i ngl ehous e s ,s ma l ly a r ds a ndunt a r r e dr oa ds . Zoneofmi ddl ei nc ome / me di umde ns i t yhous i ng Thi si sc ha r a c t e r i z e dbyl a r gehous e s , wi t hga r de nsa ndbr oa dt r e e l i ne ds t r e e t s . . As ma l lc omme r c i a lc e nt r ea nd gr e e nbe l t sc a nbef oun dwi t hi nt hi sz one . Soc i a lc e nt e r sl i kepr e s c hool sa nds c hool sc a na l s obef oundi n t hi sz one . Exa mpl e sa r eHi l l s i dea ndCr a nbor nes ubur bsi nHa r a r e . Commut e rz one I sl oc a t e ds omedi s t a nc ea wa yf r omt hec i t yc e nt e r . Pe opl eus ec ommut et ot heCBDi nor de rt oge tt owor kus i ng t r a i ns ,c a r sa ndbus e s . Thez ones t a r t sof fwi t hl owde ns i t y,hi ghi nc omer e s i de nt i a la r e a s , wi t hl a r ges pa c e dhous e sa ndga r de ns . I ns omepl a c e sma r ke tga r de ni ngma ybepr a c t i c e df ore xa mpl e Hone yDe wf a r mi nGr e e nda l e . The yus ua l l yh a veas ubur ba ns hop pi ngc e nt e rf ore xa mpl eSa m Le vyi nBor r owda l ea ndKa mphi ns ai nGr e e nda l e . Thez onema ya l s ogi v ewa yt ol a r ge rf a r mss uppl yi ngf r e s hf r ui t s , da i r ypr oduc t sa ndve ge t a bl e st ot het own. Some t i me st hef a r mi ngz onema ybei nt e r r upt e dbys ma l l dor mi t or yt ownss uc ha sChi t ungwi z a . ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Hoyt ’ sSe c t ormode l ( 1939) I twa spubl i s he da sa na l t e r na t i vet oBur ge s sa ndPa r k’ sc onc e nt r i c mode l I twa sba s e donas t udyof142Ame r i c a nc i t i e s . As s umpt i ons I nma ki ngt hemode lHoytma des omea s s umpt i ons Themode la s s ume swe a l t hype opl ewhoc a na f f or dt hehi ghe s t r e nt a l sa ndr a t e sc hos et hebe s ts i t e s . We a l t hyr e s i de nt sc a na f f or dpr i va t ec a r sort r a ns por t a t i ont hus t he yl i vef ur t he rf r omi ndus t r ya ndne a rma i nr oa ds . Si mi l a rl a ndus e sa t t r a c te a c hot he ra ndr e pe lot he rl a ndus e s . Thi spr oc e s si sr e f e r r e dt oa ss e c t orde ve l opme nt Thec i t yort owna sas i ngl eCBDorc or e . Pe opl ene e dt omovef r omonea r e aoft het ownt oa not he r . Themode l Ac c or di ngt oHoyta r e a sa l ongs i dema i nr oa ds / c ommuni c a t i on l i ne sa t t r a c tt hehi ghe s tr e nta ndr a t e s . Thec i t ygr owsi nas e r i e sofwe dge s La ndus ef ol l owst r a ns por tr out e sf r omt heCBD. Onc eac e r t a i na r e aha sde ve l ope dadi s t i nc t i vel a ndus eorf un c t i on i tt e ndst or e t a i nt ha tl a ndus ea st hec i t ygr owsout wa r ds Hoyta l s oi de nt i f i e sdi f f e r e ntr e s i de nt i a lz one si nr e l a t i ont o i nc ome ,oppor t uni t ya ndc l a s s . Se c t or st husr e pl a c et her i ngsi nBur ge s sa ndPa r k’ smode l . Thi si sbe c a us eofune qua la c c e s sa st hec i t ygr owsout wa r dsa l ong ma j orr out e s . Ma j orr out e sa t t r a c tma nuf a c t ur i ng . Ne xtt ot hei nd us t r i a lz onea r el owc l a s swor ke r ’ shous e sf or e xa mpl eMba r ea ndLe i ght oni ndus t r i e s ,Wi l l owva l ea nd Hi ghf i e l dsa ndMba r ea ndGr a ni t e s i de . The s ehous e sa r ef ol l owe dbymi ddl ec l a s shous e s( Wa t e r f a l l sne xt t oMba r e )a ndt he nhi ghi nc omeho us e s . ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Ha r r i sa ndUl l ma n’ s Mul t i nuc l e imode l( 1945) The yma det he i rs t udywe l la f t e rt heot he rt womode l sha dbe e n publ i s he da ndt husha dt hebe ne f i tofhi n ds i ghta ndc i t i e sha ds i nc e gr owni ns i z e . Fi ndi ngs The yr e a l i z e dt hef a c tt ha tmode r nc i t i e sha veamor ec ompl e x s t r uc t ur et ha nde s c r i be dbyt heConc e nt r i ca ndSe c t ormode l s Ci t i e sus ua l l ygr owf r o ms e ve r a li nde pe nde ntnuc l e ir a t he rt ha nor i na ddi t i ont ot hema i nCBD. The s ec or e si nc l udes ubur ba ns hoppi ngc e nt e r si nmos tmode r n c i t i e s . Ea c hoft he s en uc l e usa c t sa sapoi ntofgr owt ha ndus ua l l yha s s omeoft hef un c t i onsf oundi nt hema i nCBDa ndot he rnuc l e if or e xa mpl ei tmi g htha veba nks ,s hoppi ngma l l s ,s upe r ma r ke t se t c Fore xa mpl eSa mLe vys hoppi ngc e nt e r ,Ka mphi ns a ,We s t ga t e , Ma konis hoppi ngc e nt e r s The s ec e nt e r sgr owwi t ht i met ome r gewi t he a c hot he rt of or mone l a r geur ba nc e nt e r . Ha r r i sa ndUl l ma nwe r ea bl et os t udyl a t e rur ba ns e t t l e me nt st ha t ha ds a t e l l i t er e s i de nt i a la ndi ndus t r i a ls ubur bsi nt he i rmode l . I ft hema i nc i t ybe c ome st ool a r gea ndc onge s t e ds omef unc t i o ns ma ydi s pe r s et of or mn e wnuc l e i . Mul t i pl enuc l e it husde ve l opoutoft hene e df orqui c ka c c e s st ot he c e nt e r ,t oke e pc e r t a i nl a ndus e sa p a r ta ndt ode c e nt r a l i s e . Thec i t yofHa r a r ec l os e l ya ppr oxi ma t e st hi smode lwi t ht hema i n l a r geCBDa tt hec e nt e ra ndva r i ou snuc l e ii nt hef or mofs hoppi ng c e nt e r ss uc ha sBor r owda l e ,Sa meLe vy,Ma c hi pi s ai nHi ghf i e l d, Ka mphi ns ai nGr e e nda l e ,We s t ga t e ,Pe nde nni si nMtPl e a s a nte t c . I ta l s oha ss a t e l l i t et ownsi nRuwaa ndChi t ungwi z a . ZI MSECOLe ve lGe ogr a phyNot e s :Se t t l e me nt s :Zi mba bwe ’ st owns a ndCi t i e sa nI nt r oduc t i on Anur ba ns e t t l e me nti nZi mba bwei sonewhos epopul a t i oni smor e t ha n2500ormor ewi t ht hema j or i t yofi t swor ke r s( mor et ha n 50%)e nga ge di nnona gr i c ul t ur a la c t i vi t i e s . I tmus tha veac ompa c ts e t t l e me ntpa t t e r n Thi sde f i ni t i ona l s o,byc us t om,t e n dst oomi tGr owt hPoi nt se ve n whe nt he yme e tt hede f i ni t i on. Ac c or di ngt ot he2012c e ns usr e por t33%oft hepopul a t i oni n Zi mba bwel i vei nur ba na r e a sa nd47%oft heur ba npopul a t i on l i ve si nHa r a r e Mos t ,i fnota l lofZi mba bwe ’ st ownsa r ei nf l ue nc e dbyt he i r c ol oni a lhe r i t a ge . Ea c ht ownus ua l l yha sac or e / CBD Ani ndus t r i a lz onee . g.Wi l l owva l ei nHa r a r e hi ghde ns i t yorl owi nc omer e s i de nt i a lz onee . g.Hi ghf i e l dsi n Ha r a r e mi ddl ei nc omer e s i de nt i a lz one( mi ddl ede ns i t ys ubur b)e . g Cr a nbor nei nHa r a r e l owde ns i t yorhi ghi nc omer e s i de nt i a lz onee . g.Bor r owda l ei n Ha r a r ea nd s ubur ba nc omme r c i a lc e nt e r se . g. Sa mLe vya ndWe s t ga t ei n Ha r a r e Ot he rc i t i e sha ves a t e l l i t et ownsa r oundt he mf ore xa mpl eNor t on, Chi t ungwi z aa ndRuwaa r oundHa r a r e The r ea r eve r yf e wl a r geur ba ns e t t l e me nt si nZi mba bwe Ast henumbe rofs e t t l e me nt si nc r e a s e sa st he i rs i z ede c r e a s e si . e . t he r ea r emul t i pl es ma l lur ba nc e nt e r s . Mos tur ba nc e nt e r sr os eoutofa dmi ni s t r a t i vec e nt e r sf ore xa mpl e Ha r a r e ,Bul a wa yo,Gwe r u,Bi ndur aa ndMa r onde r aa c ta s pr ovi nc i a la dmi ni s t r a t i vec e nt e r s Somet ownsbe ga na smi ni ngc e nt e r sf ore xa mpl eHwa nge , Zvi s ha va ne ,Shur ugwi ,Kwe kwe ,Bi ndur a ,Ka domaa ndGwa n da . Somegr e wa ss e r vi c ec e nt e r s .Fore xa mpl es omet ownsa c ta s a gr i c ul t ur a ls e r vi c ec e nt e r sf ors ur r oundi ngf a r ml a ndse . g.Ha r a r e , Gwe r u,Bul a wa yo,Mut a r ee t c . Af e wt ownsgr e wa st our i s t / r e s or tt ownsf ore xa mpl eVi c t or i a Fa l l s ,Ka r i baa ndMa s vi ngo. ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Tr a ns por t :I nt r oduc t i on r e f e r st ot heme a nsbywhi c hgoodsa ndpe opl ea r emove df r om onepoi ntt oa n ot he ront hee a r t h’ ss ur f a c e . Tr a ns por ti sa nout c omeofs uppl y( pr oduc t i on)a ndde ma nd ( c ons umpt i on) . Goodsorr a wma t e r i a l sma ybepr oduc e di nonea r e awhi l e c ons ume r sorma nuf a c t ur e r sma ybef oundi na not he ra r e a . Tr a ns por tt he r e f or ea c t sa sal i nkb e t we e nt het wo. Fore xa mpl eCot t onha st obet r a ns por t e df r omf a r mst ot he we a vi ngi ndus t r i e s . Thec l ot ht he nha st obet r a ns por t e dt oc l ot hi ngi ndus t r i e swhe r e t he ya r et ur ne di nt oc l ot he s . Thec l ot he st he nha vet obet r a ns po r t e dba c kt ot hec us t ome r s . Al s ot hes pa t i a ldi s t r i but i onofs e r vi c e ss uc ha shome sa nd wor kpl a c e sc r e a t e st hene e df ort r a ns por t . Fore xa mpl epe opl eha vet obef e r r i e dt oa ndf r omwor kba c kt o t he i rhome sonada i l yba s i si . e .c o mmut e r s . Pe opl ea l s omovet oaf r ompl a c e sofs oc i a la ndc ul t ur a la c t i vi t i e s . Tr a ns por ti sne c e s s i t a t e dbydi s t a nc e . Whe r e ve rt he r ei sdi s t a nc ebe t we e nt wopl a c e s ,t he r ewi l lben e e d f ort r a ns por t . Fa c t or sa f f e c t i ngt r a ns por tc hoi c e . Thec hoi c eoft r a ns por tt ha twi l lbeus e dbe t we e nt wopoi nt s de pe ndsont hef ol l owi ng: Thet ypeofgoodst obet r a ns por t e de . g.l i qui dsc a nbec a r r i e dby pi pe l i neort a n ke r s Thequa nt i t yofgoodst obet r a ns por t e de . g.bul kyorhe a vygo ods c a nbes hi ppe dort r a ns por t e dbyr a i lwhi l el i ghtgoodsc a nbe f l owni n. Qua l i t yf ore xa mpl ep e r i s ha bl e sne e dt obet r a ns por t e dqui c kl yt o t hema r ke tbe f or et he ygoba d. Thenumbe rofpe opl et ot r a ns por t . Huma npr e f e r e nc e Thec os toft het ypeoft r a ns por t Ac c e s s i bi l i t yo ft hes our c ea ndde s t i na t i on. Ava i l a bi l i t yofr oa ds ,na vi ga bl er i v e rorr a i l wa yl i ne st ous e . Thea f f l ue nc eoft hepe opl ei nvol ve d. ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Type sofTr a ns por t Tr a di t i ona l Thi sr e f e r st of or msoft r a ns por t st h a tha vebe e ni nus es i nc e a nt i qui t yi nc l udi ng: Thehuma nbe i ng( por t e r )i . e .wa l ki ng,r unni ng,c a r r yi nggoodson t he i rhe a ds ,s ho ul de r sorba c ks . Hor s e s mul e s donke ys c a me l s c a r t s s l e dge s r i c ks ha ws bi c yc l e s c a noe s Dhows . Mode r n Thi sr e f e r st ot hos ef or msoft r a ns p or tt ha tha vebe e nbr ought a boutbymode r nt e c hnol ogi c a la dva nc e me nt s . Ve hi c l e sf ore xa mpl ec a r s , l or r i e s t r a mc a r s bus e s , c ommut e romni bus e s( kombi s ) t r a i ns s hi ps pl a ne s pi pe l i ne s ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Huma nBe i ngs / Por t e r s Us i nghuma nbe i ngsorpor t e r sf ort r a ns por tha st hef ol l owi ng a dva nt a ge sa nddi s a dva nt a ge s : Adva nt a ge s I ti sc he a pe s pe c i a l l ywhe r es ma l lq ua nt i t i e sofgoodsa r ei nvol ve d. I ti se a s ya st he r ea r enos pe c i a lr e qui r e me nt sorl a ws . I ti sr e a di l ya va i l a bl e . I ti sve r s a t i l ei . e .huma nsc a nc a r r yava r i e t yofgoodswi t houtt he ne e df ora da pt a t i ons Doe snotr e qui r es pe c i a lt r a ns por tne t wor kse . g.ar a i l wa yl i nea s t he yc a nj us tus et r a c ks . Ca nbeus e dt or e a c hr e mot ea r e a sa nda r e a st ha ta r eha r dt oa c c e s s us i ngot he rme a nsoft r a ns por te . g.mount a i nousr e gi ons . Di s a dva nt a ge s The r ei sal i mi tt ot hequa nt i t yofgoodst ha tahuma nbe i ngc a n c a r r y. Huma nst i r ee a s i l y. I ti sas l owf or moft r a ns por t . Ne e dsc ons t a ntr e s t . Ca nc he a tors t e a l . ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Dr a ughtPowe r Dr a ughtpowe r Re f e r st ot heus eofa ni ma l ss uc ha se l e pha nt s ,mul e s ,donke ys , c a me l sa ndhor s e s Adva nt a ge s I ti sc he a p I ti smuc hmor er e a di l ya va i l a bl e Ca ns c a l es t e e pt e r r a i na ndr e a c hi na c c e s s i bl ea r e a s . Doe snotr e qui r es pe c i a lne t wor kse . g.r oa d/ r a i l Di s a dva nt a ge s Ca nonl yc a r r yal i mi t e da mountofgoods I ti ss l ow. I ti snotdur a bl e Ne e dsc ons t a ntr e s t . I tc a nbei ne f f i c i e nta ndunc e r t a i n. ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Dr a ughtPowe r Adva nt a ge s c he a p c l e a n ve r s a t i l e s i mpl ea nda va i l a bl et e c hnol ogywhi c hma ke st he me a s yt o ma nuf a c t ur ea ndr e pa i r Us ua l l yt he ydonotr e qui r er out ep e r mi t s Di s a dva nt a ge s The yonl yc a r r yal i mi t e da mountofgoods / pe opl e Ca nc a us et r a f f i cc onge s t i onorma kei twor s e . The yc a nbet i r e s omea st he ya r epowe r e dbyhuma ne ne r gy. Sl ow ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Ca noe sa ndDhows The ya r ec he a p c l e a n The ya r eve r s a t i l ea st he yc a nc a r r yava r i e t yofgoods The ya r es i mpl et oma nuf a c t ur ea n dr e pa i r . Di s a dva nt a ge s Ca nnotc a r r yl a r gea mount sofgoodsa ndpa s s e nge r s . The ya r eve r ys l ow. The yr e qui r en a vi ga bl ewa t e rbodi e sa ndc a na l s . The yma yc a ps i z ec a us i ngde a t ha nd/ ori nj ur y/ da ma get ogood s Someoft he ma r epowe r e dbyhuma ne ne r gywhi c hc a nbet a x i ng. ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Mot orve hi c l e s Adva nt a ge s I sf a s t The ya r ec omf or t a bl ee . g.t he yha v ea i rc ondi t i oni nga ndhe a t i ng. The ya r epr ot e c t e df r o mwe a t he re l e me nt s . The yc a nc ond uc tdoort odoorde l i ve r i e s . I nde pe nde nti . eyouc a ndr i vet he mt owhe r e ve ryoul i kewhe ne ve r youwa nta st he ydonotha vef i xe dt i met a bl e sorr out epe r mi t s Di s a dva nt a ge s The ya r ee xpe ns i vet obuya ndma i nt a i n The yc a r r yf e we rpa s s e nge r s Mos ta r enotve r s a t i l ee . g.t he r ea r ekombi s ,t r uc ks ,va ns ,s e da ns e t c . The yc a nc a us ef a t a la c c i de nt s . The ypol l ut et hee nvi r onme nt . The yc r e a t ec onge s t i on The yr e qui r er oa ds . The yr e qui r ef ue lwhi c hmi ghtma ket he me xpe ns i vet oope r a t e ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Bus e sa ndTr a mc a r s Adva nt a ge s The ya r ef a s t The ya r ec omf or t a bl e The ya r epunc t ua l The yc a r r yal otofpa s s e nge r sa tonc e . The ya r ec he a pe rt ha not he rmode r nmode soft r a ns por t . The yha vepr e s c r i be dpi c kupa nddr oppoi nt s( buss t opsa nd s t a t i ons ) Ther e duc et r a f f i cc onge s t i on The yus ec he a pe rf ue l s( i . eDi e s e lwhi c hi smi s t i l yc he a pe rt ha n pe t r ol ) Enj oye c onomi e sofs c a l e . Di s a dva nt a ge s The ya r el e s sve r s a t i l e Ca nnotpr ovi dedoort odoors e r vi c e s . The ya r er e l a t i ve l ys l o w. Re qui r ee xpe ns i vegoodqua l i t yr oa ds . Ca nc a us ef a t a la c c i de nt s . Ca us ea i rpol l ut i on The f t sc a noc c ura tbuss t a t i ons Ca nnota c c e s ss omer e mot ea r e a se . g.s omepa r t soft heEa s t e r n Hi ghl a ndswe r er oa dsc a nnotbec ons t r uc t e d. Tout swhoma nt he s ebus e sof t e nc a us eha voca ndc ha os ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Tr a i nsa ndr a i lt r a ns por t Adva nt a ge s I sr e l a t i ve l yc he a p Ca r i e sbul kgoodss uc ha sc oa la ndunpr oc e s s e dor e s Ca r r i e sl a r gea mount sofgoodsa nd Ca r r i e sl a r gea mount sofpa s s e nge r s The ya r ec omf or t a bl e Ca nbeve r yf a s t The ya r el e s spr onet oa c c i de nt s Di s a dva nt a ge s Doe snotpr ovi dedoort odoors e r v i c e . Ca nnots c a l es t e e pgr a di e nt se . g.Ea s t e r nHi ghl a nds Re qui r er a i l wa yl i ne swhi c ha r ee x pe ns i vet oc ons t r uc t . Re s t r i c t i vee . g .t r a i nsi nt heSADCr e gi onma ybeuna bl et os e r vi c e ot he rc ount r i e sa st he yus edi f f e r e ntr a i l wa yga uge s . Re qui r es pe c i a lha ndl i nge qui pme ntt ol oa da ndunl oa d. I snotve r s a t i l ea ss pe c i a lt r a i l e r sa r er e qui r e df ors omel oa ds . I sr e l a t i ve l ys l owe rt ha not he rf or msoft r a ns por te . g.a i r . Nots ui t a bl ef o rpe r i s h a bl egoods . I nZi mba bweweha veonl yonet r a c kwhi c hme a nst r a i nsc a nn ot pa s se a c hot he r . ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Ai rTr a ns por t Adva nt a ge s I sve r yf a s tf ore xa mpl eat r i pt ot heVi c t or i aFa l l st a ke s1hour15 mi nut e sbya i ra ndove r12hour sbyr oa d. I sc omf or t a bl e Nota f f e c t e dbywe a t he re l e me nt s . Nota f f e c t e dbys ur f a c er e l i e f Ca nbeus e di nt i me sofe me r ge nc yf ore xa mpl ehe l i c opt e r sa r e us e di na i rr e s c uemi s s i onss uc ha sa f t e rt hee a r t hqua kei nNe pa l . Ca nc ove rl a r g edi s t a nc e swi t houtt hene e dt or e f ue l . The yc a nt a kedi r e c tr out e s . The yc a nc a r r yhi ghv a l uegoodss a f e l yf ore xa mpl et he r ea r eno a i rpi r a t e s . Di s a dva nt a ge s Ai r s pa c ei sus ua l l yr e s t r i c t e da ndc ont r ol l e dbyhos tc ount r i e sa sa ma t t e rofna t i ona ls e c ur i t y. The yc a nbea f f e c t e dbye xt r e mewe a t he rc ondi t i onse . g.c yc l o ne s . Ca nnotpr ovi dedoort odoors e r vi c e s . Re qui r ee xpe ns i vea i rpor t st ot a keof fa ndl a nd. Ai r por t sa r eus ua l l yl o c a t e df a ra wa yf r omr e s i de nt i a la nd i ndus t r i a la r e a swhi c hme a nsa ddi t i ona lmode soft r a ns por ta r e r e qui r e d. The ya r eve r ye xpe ns i vet opur c ha s ea ndma i nt a i n. Ac c i de nt sa r ea l mos ta l wa ysf a t a la ndc os t l yi nda ma get e r ms . Pr onet os a bot a gea ndt e r r or i s m. ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Se aTr a ns por t Adva nt a ge s I sr e l a t i ve l yc he a pe r . Ca r i e sbul kygoodsa tonc e The ya r eve r yc omf or t a bl ef ore xa mpl ec r ui s es hi psa ndoc e a n l i ne r sa r eof t e nf i t t e dwi t hl uxur yf a c i l i t i e ss uc ha sba t hr ooms , t oi l e t s ,c a s i nosa nde nt e r t a i nme ntf a c i l i t i e s . Ea s yha ndl i ngofgoodsf ore xa mpl eRoRos hi ps . Di s a dva nt a ge s Sl owe rt ha not he rf or msoft r a ns po r te . g.a i r . Re qui r e sgoodpor t s Re qui r e ss pe c i a lha ndl i nge qui pme ntt ol oa da ndunl oa d. Ca nbes us c e pt i bl et owe a t he rha z a r dss uc ha sc yc l one s . Ac c i de nt sc a nc a us eda ma get ope opl e ,goodsa ndt hee nvi r onme nt f ore xa mpl eOi ll e a ks . ZI MSECOLe ve lGe ogr a phyNot e s :Tr a ns por t :Pi pe l i ne Adva nt a ge s The ya r eve r ye f f i c i e nt The ya r ec he a ponc et hei ns t a l l a t i onha sbe e nc ompl e t e d. The yc a nc a r r yf l ui dsi nbul k. Di s a dva nt a ge s The ya r ei mmobi l ei . e .t her out ec a nnotbec ha nge donc et he ya r e i ns t a l l e d. Ca nonl yc a r r yf l ui dss uc ha soi l ,g a sa ndwa t e ra ndnots ol i dsl i ke me a t . The ya r eve r ye xpe ns i vet oi ns t a l la ndma i nt a i n. The ya r ee a s yt os a bot a gee . g.t heRENAMOba ndi t sc ons t a nt l y t hr e a t e ne da nds a bot a ge dZi mba bwe ’ sBe i r a Fe r ukapi pe l i ne dur i ngt heMoz a mbi c a nCi vi lWa r . Le a ksa ndda ma gec a nbedi f f i c ul tt ode t e c ti ft hepi pe l i nei s unde r gr ound. Spe c i a lpi pe l i ne sa r er e qui r e dt oc a r r yf l a mma bl e s . ZI MSECOLe ve lGe ogr a phyNot e s :We a t he r i ng Ea r t hmove me nt s( pl a t et e c t oni c s )c r e a t ea ndl e a dt ot he de ve l opme ntoft hee a r t h’ sma j orl a ndf or msf ore xa mpl eBl oc k Mount a i ns ,vol c a ni cc one s ,l a vapl a t e a usa ndr i f tva l l e ys . Ass oona st he ya r ef or me dde nuda t i onpr oc e s s e sa t t a c k,e xpos e a ndgr a dua l l ywe a rt he s el a ndf or msa wa y. De nuda t i oni sat e r mt ha ti sus e dt ode s c r i bet hef or c e st ha twe a r a wa yt hel a nds ur f a c ei ti nc l ude st h epr oc e s s e sofwe a t he r i ng, e r os i on,t r a ns por t a t i ona ndma s swa s t i ng. We a t he r i ng We a t he r i ngr e f e r st ot hewe a ke ni ng,br e a ki ngup,a nd di s i nt e gr a t i onofr oc kst ha tf or mt h es ur f a c eoft hegr ounda ndl i e e xpos e dt ot hewe a t he re l e me nt si ns i t u. Thel i t t l ephr a s ei ns i t ui saLa t i nphr a s ewhi c hs i mpl yme a ns“ i n i t sor i gi na lpl a c e ”/ ” s t a t i ona r y. ” Exa mi ne r sa tZI MSEC,Ca mbr i dgea ndot he re xa mi ni ngbodi e sof t e n a s ks t ude nt st odi s t i ngui s hbe t we e nwe a t he r i nga nde r os i on. We a t he r i ng Br e a ki ngdownofr oc ks Ha ppe nsi ns i t u( i ss t a t i c ) Pr oduc e si ns e l be r gsa ndka r s tl a nds c a pe s Er os i on Wa s hi nga wa yofs o i lby e i t he rwi nd,wa t e rori c e . Wa s hi nga wa yoft o ps oi l Pr oduc e sgul l i e sa nd donga s Ca us e dmos t l ybyt e mpe r a t ur eva r i a nc e sa nd Ca us e dbyt hemove me nt a c i dr a i n( i . et he r ea r et wot ype sc he mi c a la nd ofwa t e r ,wi nda ndi c e me c ha ni c a l ) Ma s swa s t i ng Cr e e pmove me ntonas l ope .I ma gec r e di tMys c hool s t uf f . c o. z a i st hemove me ntofr e gol i t ha ndot he rwe a t he r e dma t e r i a le nma s s e duet ot hef or c eofgr a vi t y. I tt a ke spl a c ei nt hef o r mofmuds l i de sa ndr oc kf a l l swhe nas e mi l i qui ds pongyma s sf a l l sdownas l opea sas i ngl ema s sa soppos e d s a yt oe r os i onwhe nt hes oi la ndr e gol i t hi swa s he ddownt hes l ope i ns t e a d. Ma s swa s t i ngi nc l ude ss uc hpr oc e s s e sa sc r e e pi ng,s oi la ndr oc k s l i de s ,t oppl e sa ndf a l l s . I tc a nt a kepl a c ea tas l owa l mos ti mpe r c e pt i bl epa c ea si nc r e e por qui c kl yi nt hef or mofs udde nr oc kf a l l sa ndl a nds l i de s . The r ea r et wot ype sofwe a t he r i ng: 1.Phys i c a l / Me c h a ni c a lwe a t he r i ng. 2.Che mi c a lwe a t he r i ng. NBAs pe c t sofbi ol o gi c a lwe a t he r i nga r ee i t he rgr oupe da sbe i ng phys i c a lorc he mi c a lde pe nd i ngwi t ht he i rna t ur e ,ac r i t e r i onwhi c h ZI MSECs e e mst of a voura tOr di na r yLe ve l . ZI MSECOLe ve lGe ogr a phyNot e s :Ma i nt ype sofwe a t he r i ng: Che mi c a lwe a t he r i ng Che mi c a lwe a t he r i ngi st hebr e a ki n gdownorde c ompos i t i onof r oc ksa sar e s ul tofva r i ousc he mi c a lpr oc e s s e sa ndr e a c t i ons a l t e r i ngt hec he mi c a lc ompone nt soft her oc k. Somet ype sofr oc ksde c ompos ewhe nt he yc omei nt oc ont a c twi t h wa t e r ,oxyge n,c a r bondi oxi dea ndot he rna t ur a l l yoc c ur r i nga c i ds s uc ha si nt hes oi l . The s ea c i dsi nc l udehumi ca c i ds ,c a r boni ca c i ds ,a c i dr a i na nd s mog( whi c hi sf ogl a c e dwi t ht oxi ca nds ome t i me sc or r os i ve ma t e r i a l s ) . Somemi ne r a l si nt her oc ksf ore xa mpl ec a l c i uma r es us c e pt i b l et o c he mi c a lr e a c t i on. The yunde r goc he mi c a lc ha nge sa ndf a l loft her oc kl e a di ngt ot he r e duc t i onoft her oc k’ ss i z e . Che mi c a lwe a t he r i ngpr oc e s s e si nc l udeoxi da t i on,hydr a t i on, hydr ol ys i s ,c a r bona t i on,or ga ni cwe a t he r i nga nda c i dr a i n. Che mi c a lwe a t he r i ngi smos tpr e va l e nti nhumi dz one s ,a ga i ns t r e a c t i vemi ne r a l si nr o c ksa tt ypi c a l l ya tt heba s eofs l ope swh e r ei t i sl i ke l yt obewe ta ndhumi df ore x t e nde dpe r i odsoft i met oa l l ow t hec he mi c a lp r oc e s s e st ooc c ur . Oxi da t i on Oc c ur swhe nr oc ksormor es pe c i f i c a l l yc e r t a i nmi ne r a l swi t hi nt he r oc ksa r ee xpo s e dt oa ndr e a c twi t hoxyge ni nt hea i rorwa t e r . Themos tpr e va l e ntoft he s ei swhe nr oc ksc ont a i ni ngi r on c ompoundsr e a c twi t hoxyge nt oi naf or mofoxi da t i on c a l l e dr us t i nga st her oc ki st r a ns f or me df r omwha ti sknowna sa f e r r ouss t a t et oaf e r r i cs t a t e . Dur i ngr us t i ngr oc ksc ha nget he i rc ol oura ndbe c omer e ddi s hbr own( t hec ol ourofr us t ) . Thi sc ompr omi s e st hei nt e gr i t ya nds t r uc t ur eoft her oc kma ki ng t he mc r umbl ee a s i l yt husa i di ngot he rf or msofwe a t he r i nga swe l l . Re duc t i on( t heoppos i t eofoxi da t i on)a l s ooc c ur si nwa t e r l ogg e d a r e a swhe r eapr oc e s sc a l l e dgl e yi ngt a ke spl a c e . Hydr a t i on Somet ype sofr oc ksf ore xa mpl et hos et ha tc ont a i ns a l tmi ne r a l s ha vet hec a pa c i t yt oa b s or bwa t e ri nt ot he i rs t r uc t ur ec a us i ngt he m t os we l la ndbe c omes us c e pt i bl et of ut ur ebr e a kdown. Hydr a t i oni si na c t ua lf a c taphys i c a l c he mi c a lwe a t he r i ng pr oc e s s e ss i nc et her oc kss we l la nde xe r tpr e s s ur ei na ddi t i ont o c ha ngi ngt he i rc he mi c a ls t r uc t ur e . Ther oc ks we l ldur i ngwe tpe r i odsa ndc ont r a c tdur i ngdr ype r i ods c a us i ngt he mt of r a c t ur ea ndt ode v e l opj oi nt sa ndwe a kne s s e s . Fore xa mpl ea nhydr i t ea bs or bswa t e rt obe c omegyps um. Hydr ol ys i s Hydr oge ni onsi nwa t e rr e a c twi t hmi ne r a l si onsi nt her oc k Tha ti st hewa t e rr e a c t swi t hmi ne r a l si nt her oc ki ns t e a dof di s s ol vi ngi t . Thi sgi ve sr i s et odi f f e r e ntc ompounds . Thi si sve r yc ommoni ngr a ni t ea r e a s Whe r et hef e l ds pa ri nt hegr a ni t e / i gne ousr e a c t swi t hhydr oge nt o f or mc l a y. Mi c aa not he rr oc kmi ne r a lc a na l s obea f f e c t e dbyhydr oge ni n a c i di cwa t e rs ol ut i ons . Ca r bona t i on Thi si swhe nc a r bondi oxi dedi s s ol ve swi t hr a i nwa t e rt of or m c a r boni ca c i d. Thi swe a ka c i dr e a c t swi t hr oc kst h a ta r ec ompos e dofc a l c i um c a r bona t ef ore xa mpl el i me s t one . Thec a l c i umi sdi s s ol ve da ndr e move di na sac a l c i umbi c a r bona t e s ol ut i onbyr unni ngwa t e r . Thema yr e s ul ti nt hef or ma t i onofl a ndf or mf e a t ur e ss uc ha s Unde r gr oundc a ve ss uc ha st heCh i nhoyic a ve sa swe l la sot he r l i me s t onef e a t ur e ss uc ha ss t a l a gmi t e sa nds t a l a c t i t e s . Sol ut i on Somemi ne r a l sl i ker oc ks a l ta r es o l ubl ei nwa t e r Whe nt he yc omei nc ont a c twi t hwa t e rt he yj us tdi s s ol vei ns i t u. Ast her oc ksdi s s ol vei nwa t e rt he yma yf or mc l i nt sa nd gr i ke s / gr yke swhi c ha r ec ol l e c t i ve l yknowna sl i me s t one pa ve me nt s . Or ga ni cWe a t he r i ng De c ompos i ngve ge t a t i on( humus )r e l e a s e shumi ca c i d. Thi sa c i da t t a c ksc a l c i um,ma gne s i uma ndi r onmi ne r a l swi t hi n r oc ksi napr oc e s sc a l l e dc he l a t i on. Ther e s pi r a t i onofba c t e r i aa ndpl a n tr ooti nc r e a s e sc a r bondi oxi de l e ve l swi t hi nt hes oi lt husa c c e l e r a t i ngt hepr oc e s sofc a r bona t i on. Li c he ne xt r a c t si r onf r omr oc ksvi ar e duc t i on. Ac i dr a i n Huma na nde c onomi ca c t i vi t i e sa r er e a l i s i ngmor ea ndmor e c a r bondi oxi dei nt ot hea t mos phe r et oge t he rwi t hot he rc he mi c a l s s uc ha sSul phurdi oxi d ea ndni t r i coxi de . The s ega s e st he ndi s s ol ve di nt or a i nwa t e rt of or ma c i di cs ol ut i ons . Ac i dr a i na t t a c ksa ndc or r odel i me s t one sa nda tal e s s e rr a pi dr a t e s a nds t one s . Al s ot hea c i di cs ol ut i onst e ndt of r e eupoxyge ni onst husf ue l i ng t hepr oc e s sofhydr ol ys i s . Phys i c a lwe a t he r i ng ZI MSECOLe ve lGe ogr a phyNot e s :Phys i c a lWe a t he r i ng Phys i c a lwe a t he r i ngi st hedi s i nt e gr a t i onofar oc ki nt os ma l l e r pa r t i c l e sbyme c ha ni c a lpr oc e s s e sa ndwi t houta nyc ha nge si nt he c he mi c a lc omp os i t i onoft her oc k. I ti smor el i ke l yt ooc c uri na r i dc l i ma t e ss uc ha sde s e r t s ,a r c t i c r e gi onsa nda r e a st ha tha vel i t t l et onove ge t a t i on. Phys i c a lwe a t he r i ngt ypi c a l l ypr oduc e ss a nds oi l s . Phys i c a lwe a t he r i ngi sa l s oknowna sme c ha ni c a lwe a t he r i ng. Phys i c a lwe a t he r i ngpr oc e s s e si nc l udee xf ol i a t i on,f r os ts ha t t e r i ng, pr e s s ur er e l e a s ea ndt he r ma ls ha t t e r i ng. Exf ol i a t i on Roc kse xpa ndwhe nhe a t e da ndc ont r a c twhe nc ool e dmuc hl i kea l l s ol i dma t e r i a l s . I nde s e r t sa nda r e a swi t hs c a ntve ge t a t i on,di ur na lt e mpe r a t ur e sc a n e xc e e d50° C. Dur i ngt hee xc e s s i veda yhe a tt her oc kse xpa nd. Theout e rl a ye r soft her oc kse xpa ndf a s t e rt ha nt hei nne rl a ye r s . Atni ghtt hewhe nt e mpe r a t ur e sdr op,i nde s e r t se ve ni ng t e mpe r a t ur e sc a na ndus ua l l yf a l lt obe l owf r e e z i ngpoi nt ,t her oc k c ont r a c t sa nda ga i nt heout e rl a ye r sc oolf a s t e rt ha nt hei nne rl a ye r s . Thi sr e s ul t si ns t r e s s e sbe i ngs e tupwi t hi nt her oc kc a us i ngou t e r l a ye r soft her oc kt ope e lof fl i ket h er i ngsofa noni on. Thust hepr oc e s si ss ome t i me sc a l l e doni onwe a t he r i ng. Al s os e ve r a ldi f f e r e ntmi ne r a l swi t hi nt her oc ke xpa nda ndc ont r a c t a tdi f f e r e ntr a t e sde pe ndi ngont he i rphys i c a lc ha r a c t e r i s t i c s . Thi swi l lr e s ul ti ngr a nul a rdi s i nt e gr a t i onwi t ht her oc k. Thi si st hepr oc e s st ha twa st hough tt or e s ul ti nt hec r e a t i onof e xf ol i a t i ondome sl i keDombos ha v a . Thi sf or mofwe a t he r i ngi sa l s okn owna st he r ma le xpa ns i onor i ns ol a t i onwe a t he r i ng. NBAtOr d i na r yLe ve lyoua r es uppos e dt oa c c e ptt hi sme t hodof we a t he r i nga sf a c t .Theoc c u r r e nc eoft h i sme t hodofwe a t he r i ngi nt he r e a lwor l di snowa da yss e r i ous l ydoubt e da f t e ras e r i e sofe xpe r i me n t s bype opl el i keDa vi dGr i ggsa ndot he r s . Fr os ts ha t t e r i ng I toc c ur si nr oc kst ha tha vec r e vi c e sa ndj oi nt sa ndwhe r et he r ei s l i mi t e dve ge t a t i onc ove ra ndt e mpe r a t ur e sr e vol vef l uc t ua t ea r ound 0° C. Dur i ngt heda ywhe nt e mpe r a t ur e sa r ewa r me r ,wa t e re nt e r st he c r e vi c e sorj oi nt s . Whe nt e mpe r a t ur e sf a l la tni ghtt hewa t e rf r e e z e sl e a di ngt o br e a kdown: I c eoc c upi e smor es pa c et ha nwa t e ri . ea st het e mpe r a t ur eofwa t e r f a l l sbe l ow4° Ci ts t a r t st oe xpa nd. Ast hewa t e rf r e e z e swi t hi nt her oc ki ta t t r a c t smor es ma l lpa r t i c l e s ofwa t e rwhi c hf or msmor ei c ec r ys t a l sa nde xpa ndsf ur t he r , f ue l i ngt hepr oc e s s . Wi t he a c hf r e e z ea ndt ha wc yc l et h ej oi nt se xpa ndunt i lt her oc ks s ha t t e ra ndf a l lof ft hema i nr oc ka sbl oc kf i e l ds ,s c r e ea ndt a l us . Thepr oc e s si sa l s oknowna sf r os twe dgi ng Sa l tc r ys t a l l i z a t i on Sa l i ne ( wa t e rc ont a i ni ngs a l t )wa t e re nt e r spor es pa c e si nr oc ks . Asi te va por a t e ss a l tc r ys t a l sa r el i k e l yt of or m. Thi spr oc e s sus ua l l yo c c ur si nde s e r t swhe r ewa t e ri sdr a wnt ot he s ur f a c eofr oc ks( s a nds t oner oc ks )byc a pi l l a r ya c t i on. Ast hec r ys t a l sbe c omel a r ge rt he ye xe r ts t r e s supont her oc ks c a us i ngi tt odi s i nt e gr a t e(gr a nul a rdi s i nt e gr a t i on) . Sa l tc r ys t a l l i z a t i onoc c ur sonc os t swhe r et he r ei sar e a dys uppl yof s a l twa t e r . Thepr oc e s sr e s ul t si nt hede ve l opme ntofwe a t he r i ngpi t s . Pr e s s ur er e l e a s e I nt r us i vegr a ni t el a n df or mss uc ha sba t hol i t hsa r ef or me dde e pbe l owt he s ur f a c ea ndunde ri n t e ns epr e s s ur eduet ot hewe i ghtoft heove r l yi ng ove r bur de n. I ft heove r bur de ni sr e move dbyde nuda t i onpr oc e s s e st he r ei sa s ubs t a nt i a lr e duc t i oni npr e s s ur e . Ther e duc t i oni npr e s s ur ec a us e sf r a c t ur e st ode ve l ope s pe c i a l l yon t het opl a ye r soft her oc k. The s ec r a c ksde ve l oppa r a l l e lt ot h es ur f a c ei napr oc e s st ha ti s r e f e r r e dt oa ss he e t i ng. Thi sr e s ul t si nt hef or ma t i onofe xf ol i a t i ondome sl i ke Dombos ha va ZI MSECOLe ve lGe ogr a phyNot e s :Fa c t or sa f f e c t i ngwe a t he r i ng. Ther a t ea ndpr e va i l i n gt ypeofwe a t he r i nga ta nygi ve npl a c ei s a f f e c t e dby: 1.Cl i ma t e 2.Re l i e f 3.Ve ge t a t i on 4.Roc kt ype Cl i ma t e We a t he r i ngt ype sa r edi s t r i but e da c c or di ngt ot hepr e va i l i ng c l i ma t eofgi ve na r e a se s pe c i a l l ywhe nc ons i de r i ng. Te mpe r a t ur ea ndr a i nf a l lha vet hegr e a t e s te f f e c tonwe a t he r i ng. I nc ol da r e a se s pe c i a l l yr e gi onswhe r et e mpe r a t ur e sf l uc t ua t e a r ound0° Cphys i c a lwe a t he r i ngi nt hef or moff r os ts ha t t e r( f r e e z e t ha w)i sdomi na nt . I nhota r e a ss uc ha sde s e r t swhe r et he r ea r el a r gedi ur na l t e mpe r a t ur er a nge se xf ol i a t i oni ns ol a t i onwe a t he r i ng( he a t i nga nd c ool i ng)i sdomi na nt . I nhota ndwe ta r e a sl i ket hes a va nna ha ndr a i nf or e s tc he mi c a l we a t he r i ngt a ke spl a c ei na i de dbyt hee a s i l ya va i l a bl emoi s t ur e a ndhi ght e mpe r a t ur e swhi c hf a vou rc he mi c a lr e a c t i ons . I nr a i nf or e s t st hede c ompos i t i onofhumusc r e a t e shumi ca c i d l e a di ngt oor ga ni cwe a t he r i ng. Me c ha ni c a lwe a t he r i ngpr oc e s s e s . Thusc he mi c a lwe a t he r i ngoc c ur si sdomi na nti nhota ndhumi d c l i ma t ea r e a s Cl i ma t ea l s oi ndi r e c t l ya f f e c twe a t he r i ngbya f f e c t i ngt hea mo unt ofve ge t a t i ona ndpr e s e nc eofor ga ni s mst ha tc a nl e a dt oc he mi c a l we a t he r i ng. Re l i e f Mount a i nr e gi o nsha ves t e e ps l ope swhi c hme a nst ha ti nt hee ve nt ofr a i nt he ydr a i nqui c kl yl e a vi ngt hedr y. Asar e s ul tphys i c a lwe a t he r i ngi sdomi na nta tmount a i nt opi c s e s pe c i a l l ywhe nc ons i de r i nghows omepe a kst e ndt oha ve t e mpe r a t ur e st ha tf l uc t ua t ea r oundt hef r e e z i ngpoi nte ve ni f t e mpe r a t ur e sa r equi t ehi ghe ra tt hes t a r toft hes l ope s . Moi s t ur et e ndst oa c c umul a t ea tt h eba s eofmount a i nsa i di ng c he mi c a lwe a t he r i ngp r oc e s s e s . Gr a ni t er e gi onss ome t i me sl e a dt ot hede ve l opme ntofvl e i swhi c h a r ewa t e rl ogge ds i nc egr a ni t ei si mpe r me a bl et husf a vour i ng c he mi c a lwe a t he r i ngi nt hemoi s tc ondi t i ons . Ve ge t a t i on Tr e er oot spe ne t r a t ei nt or oc ks ,wi de ni ngc r a c ks ,r e l e a s ec a r bon di oxi dedur i ngr e s pi r a t i onr e s ul t i ngi nbi ol ogi c a lwe a t he r i ng.The s e pr oc e s s e sa r en a t ur a l l ydomi na nti na r e a swhe r et he r ea r emor e t r e e s . Whe nt r e er oot sde c a yhumi ca c i dsa r epr oduc e dc a us i ng bi ol ogi c a lwe a t he r i ngapr oc e s swh i c hmor er e a di l yoc c ur si na r e a s wi t hde ns eve g e t a t i onc ove ra ndmoi s t ur es uc ha si nr a i nf or e s t sa nd i nt het r opi c s . Li c he na ndmos sgr owonr oc kpl a t e a usa nddome sa i de dby moi s t ur ef r omr a i na nda tt heba s eofs l ope sf or mi nga c i dst ha te a t i nt or oc ks . Roc kt ype Li me s t onei sve r ys of ta ndpor ous( be i ngpor ousi snott hes a me t hi nga sbe i ngi mpe r vi ous / i mpe r me a bl e )a ndt he r e f or emor ee a s i l y a f f e c t e dbypr oc e s s e ss uc ha sc a r bona t i on,mor es ogi ve nt he c he mi c a lc omp os i t i onoft her oc k. Gr a ni t er oc ki sha r da ndnonpor ousa ndt husl e s ss us c e pt i bl et o c he mi c a lwe a t he r i ngp r oc e s s e swhi c hr e qui r eac e r t a i na mountof moi s t ur ei nor de rt ooc c ur . Di f f e r e ntr oc kt ype sa r ec ompos e dordi f f e r e ntc he mi c a l st ha ts t a nd ondi f f e r e ntpl a c e soft her e a c t i vi t ys e r i e s . Che mi c a l sf oundi nl i me s t oner e a di l yr e a c twi t hwe a ka c i dswhi l e gr a ni t er oc ksa r emor er e s i s t a nt . Expos ur e Roc kst ha ta r ee xpos e dt ot hes ur f a c et e ndt obewe a t he r e df a s t e r t ha nbe dr oc kwhi c hi sc ove r e d. Howe ve rme c h a ni c a lwe a t he r i ngpr oc e s s e ss uc ha spr e s s ur e r e l e a s ec a ns t i l loc c uri ft heove r bu r de ni sbe i ngr e move dby de nuda t i onpr oc e s s e s . ZI MSECOLe ve lGe ogr a phyNot e s :La ndf or msr e s ul t i ngf r om we a t he r i ng. We a t he r i ngpr oc e s s e sa ndus ua l l yi nc onj unc t i onwi t hot he r de nuda t i onpr oc e s s e ss uc ha swa t e ra ndwi nde r os i ona ndma s s wa s t i ngr e s ul t si nt hef or ma t i onofva r i ousl a nds c a pe s . I nt e mpe r a t ea ndt r opi c a ll a t i t ude st he s ei nc l ude : 1. I ns e l be r gs / Mona dnoc ks Thewor di ns e l be r gi sGe r ma nf or“ i s l a ndmount a i n” Mona dnoc ki sWe s tI ndi a nf ori s ol a t e dmount a i n. Ani ns e l be r gormona dnoc ki sa ni s ol a t e dr oc khi l l ,knob,r i dg e ,or s ma l lmount a i nt ha tr i s e sa br upt l yf r omage nt l ys l opi ngor vi r t ua l l yl e ve ls ur r oundi ngpl a i n. The ya r ehi l l sma deupofr oc kpi l e sorbl oc ksofr oc kst ha tr i s e f r oma na r e aofr e l a t i ve l yf l a ta nd/ o rl owe rt e r r a i n. I ft hemona dnoc ki sdo me s ha pe da ndf or me df r omgr a ni t e gne i s s , i tc a na l s obec a l l e dabor nha r dt . Commoni ns e l be r gsi n c l ude :c a s t l ekopj e s ,t or s,ba l a nc i ngr oc ks a ndc oni c a lhi l l swi t hr e c t a ngul a rs i de s . We a t he r i nga l s of or ms : 2)Ruwa r e s / Dwa l a s / Wha l e ba c ks 3)Ka r s tl a nds c a pe s 4)Mount a i npe a kst ha ta r eus ua l l yma deupofr oc kswhe nt hemount a i n c or ei se xpos e d. ZI MSECOLe ve lGe ogr a phyNot e s :La ndf or msr e s ul t i ngf r om we a t he r i ng:Dwa l a Knowna sr uwa r ei nShona ,dwa l ai nNde be l e( Ngunil a ngua ge s ) a ndwha l e ba c ki nEngl i s h. Ane xa mpl ei sDombos ha vawhe r es e ve r a ls uc hl a ndf or msc a nbe f ound. I ti sahi l lorr o c kwhi c hi sdomes ha pe da ndr i s e ss e ve r a lme t r e s f r omt hegr oun d. I ti sane a rl e ve lr oc kout c r op,t ha tde ve l opswhe r et heba s a l s ur f a c ei sundul a t i ng. Dwa l a sa r ege nt l ys l opi ng, l owl yi nga ndr ounde dore l onga t e dhi l l s . The ya r ea bout25mi nhe i ght . The yha veage nt l e ,c onve xs ummi tt ha ti sus ua l l ys moot hbutc a n ha ves he e tj oi nt sa sar e s ul tofpr e s s ur er e l e a s ea ndr e gol i t ht ha ti s oni onpe e ls ha pe da sar e s ul tofe x f ol i a t i on. I t ss l ope sa r ec onve x/ r e c t i l i ne a ra ndge nt l e . Mi ghta l s oha veve r t i c a lj oi nt swhi c hbe gi na sf r a c t ur e sa sar e s ul t ofpr e s s ur er e l e a s ebuta r ef ur t he rwi de ne dwe a t he r i ngpr oc e s s e s . The ya r es ur r o unde dbyde e pl ywe a t he r e dr e gol i t h The ya r eus ua l l yba r eofve ge t a t i onbutc a nbel i ght l ypopul a t e dby s hr ubsa ndbus he s . Thef or ma t i onofdwa l a s Thedi a gr a msbe l owde t a i lt hepos s i bl ef or ma t i onofadwa l a . Anunde r gr oundi nt r us i one . g.ba t hol i t hi se xpos e dbyde nuda t i on. Theove r bur de ni sr e move dbyde nuda t i onpr oc e s s e sr e s ul t i ngi n pr e s s ur er e l e a s ea ndt hef or ma t i onofadwa l a / r uwa r e . Adwa l a / r uwa r ei sf or me dwhe nt heove r bude ni sr e move d. ZI MSECOLe ve lGe ogr a phyNot e s :La ndf or msr e s ul t i ngf r om We a t he r i ng:Kopj e s Tor s / Kopj e s / Ca s t l ekopj e s Tor s / kopj e s / c a s t l ekopj e sa r ei ns e l b e r gs . Tor st hes a mea skopj e se ve nt houghs omebooksma kea na t t e mpt t odi s t i ngui s hb e t we e nt het wo. Di f f e r e ntna me sa r ea ppl i e di ndi f f e r e ntl oc a l i t i e st owha ta r e e s s e nt i a l l yt hes a mel a ndf or ms . Kopj ei sa nAf r i ka a nswor dme a ni n gas ma l la ndi s ol a t e dhi l lma de ofgr a ni t er oc kpi l e s . Tori saSc ot i s hwor dme a ni nghi l l . The ya ppe a ra ppe a ra sal a r ge ,f r e e s t a ndi ngr oc kout c r opt ha t r i s e sa br upt l yf r omt hes ur r oundi ngs moot ha ndge nt l es l ope so fa r ounde dhi l ls ummi torr i dgec r e s t . The ya r er e s i s t a ntr oc kf e a t ur e st ha tha vebe e nma debywe a t h e r i ng. The ya r eus ua l l yl e s st ha n5me t e r si nhe i ght . The ya r ear e s u l tofma r gi na ls ubs u r f a c ewe a t he r i ngofdome d l a ndf or ms . Gr a ni t ei nt r us i onsa r ewe a t he r e dbe ne a t ht hes ur f a c eduet oa c i di c wa t e rpe ne t r a t i ngj oi nt si nt her oc k. Whe nt her oc ki se xpos e dt her ot t e npa r t sa r ewa s he da wa yby e r os i on. We a t he r i ngc o nt i nue si nt hef or mofbot hme c ha ni c a la ndc he mi c a l we a t he r i ng. Be c a us et he s er oc ksh a ver e c t a ngul a rj oi nt s ,c he mi c a la nd me c ha ni c a lwe a t he r i ngt a ke spl a c ei nt he s ej oi nt s . Ther e gol i t h( we a t he r e d/ r ot t e npa r t soft her oc k)i ss t r i ppe da wa y bye r os i ont of or makopj e / t or . I ft hej oi nt sa r ec l os et oge t he rt hewhol ema s sc ol l a ps e sa ndi s wa s he da wa y, Howe ve ri ft hej oi nt sawi de rbl oc ksofr oc ksf a l la wa yf r omt h e ma i nr oc kc r e a t i ngt or s / kopj e s . The ya r es ome t i me sr e mna nt sofd wa l a sa ndbor nha r dt ss uc ha s Dwa l a s /Bor nha dt sa ndi ns e l be r gs / Mona dnoc ks . The ya r eus ua l l yf oundi nt e mpe r a t el a t i t ude s . Be c a us eoft he i rmor phol ogy( s ha p e )kopj e sa r eknowni ss ome l oc a l i t i e sa sc a s t l ekopj e s . Ba l a nc i ngr oc ks The s ea r ear e s ul tofc ont i nue dwe a t he r i ngonkopj e sa ndt or s . I ft hej oi nt si nt her oc kst ha tf or mk opj e sa ndt or sa r ef ur t he ra pa r t ma s s i vec hunksofr oc kma ywi t hs t a ndt hede nuda t i onpr oc e s s e st o r e ma i nba l a nc i ngoneont opofa no t he r . Ane xa mpl ea r et heBa l a nc i ngRoc ksi nEpwor t h. Li me s t onepa ve me nt s ZI MSECOLe ve lGe ogr a phyNot e s :Li me s t onepa ve me nt s Li me s t onepa ve me nt sa r ef l a ta r e a sofe xpos e dl i me s t oner oc ks . The ya r epa r toft hedi s s ol ve dbe dd i ngpl a t ewhi c hma yha veb e e n e xpos e dbe c a us et hes ur f a c es oi lma yha vebe e nr e move dby gl a c i a la c t i vi t ya ndne ve rr e pl a c e d. Whe r et hepa ve me ntha sj oi nt st ha tr e a c ht hes ur f a c e ,t he s ej oi nt s ma ybewi de ne dbya c i dr a i nwa t e r . Thi spr oc e s si sc a l l e dc a r bona t i on. Thewi de ni ngoft hej oi nt sl e a ve sd e e pi nc i s i ons / ga s he s / f i s s ur e s c a l l e dgr i ke s . Somegr i ke ss uc ha sf oundi nt heLi me s t oner e gi onsofEngl a nd c a nbea boutha l fame t e rwi de . Se pa r a t i ngt hegr i ke sa r ef l a t t oppe dye tdi s s e c t e dbl oc ksr e f e r r e d t oa sc l i nt s . Ast i mepa s s e st he s ec l i nt sa r el e ve l l e dbyde nuda t i onpr oc e s s e s i nc l udi ngt hewi de ni ngoft hegr i ke sunt i lal owe rbe ddi ngpl a n ei s e xpos e d. Thi sbe ddi ngpl a ne ’ sj oi nt sa r ei nt ur na t t a c ke dbywe a t he r i ngi n t hef or mofc a r bona t i onf or mi nggr i ke sa ndt husr e pe a t i ngt he pr oc e s sa l love ra ga i n. Gr i ke sc a na l s obef or me dbys ubs ur f a c ewe a t he r i ngi nmuc ht he s a mewa ya st or sa r ef or me d. Ac i di cwa t e rma ys e e pi nt ot hegr oundi nt oj oi nt si nt heunde r l yi ng l i me s t onebe ddi ngr oc k. Ove rt i mei twi de nst h e s ej oi nt sa ndwhe nt heove r l yi ngs oi li s wa s he da wa ybye r os i ont hec l i nt sa ndgr i ke sa r ee xpos e d. ZI MSECOLe ve lGe ogr a phyNot e s :Pe opl ea ndwe a t he r i ng Howhuma nsi nf l ue nc ewe a t he r ? Huma na c t i vi t i e ss uc ha si ndus t r i a l i s a t i ona nddr i vi ngofc a r s pr oduc ee mi s s i onss uc ha ss ul phurdi oxi de , ni t r i coxi dea ndc a r bon di oxi del e a di ngt oi nc r e a s e di nc i de nc e sofa c i dr a i nwhi c hi nt ur n a c c e l e r a t e sc he mi c a lwe a t he r i ngpr oc e s s e ss uc ha sc a r bona t i on . The s ei ndus t r i e ss ome t i me sdumpa c i di cc he mi c a l si nt odr a i nsa nd r i ve r sl e a di ngt oc he mi c a lwe a t he r i ng. De f or e s t a t i oni nc r e a s e sr unof fa ndr e duc e st hemoi s t ur er e t e nt i on ofc e r t a i na r e a sl e a di ngt oade c r e a s ei nbi ol ogi c a la ndc he mi c a l we a t he r i nga nda ni nc r e a s ei nme c ha ni c a lwe a t he r i ng. Huma nsa r ea l s oi ndi r e c t i l ya f f e c t i ngwe a t he r i ngt hr ought he pr oc e s sofgl oba lwa r mi ng.Thee f f e c t sde pe ndont hee ns ui ng c l i ma t i cc ondi t i onsi ne a c hgi ve na r e a . Pl a t i ngoft r e e sc a nl e a dt oi nc r e a s e dc he mi c a lwe a t he r i ng. Bl a s t i nga ndmi ni ngope r a t i onsc a nl e a dt os e i s mi cmove me nt st ha t c a nc r e a t ef r a c t ur e st ha tc a nbee xpl oi t e dbywe a t he r i ngpr oc e s s e s s uc ha sf r e e z ea ndt ha wa ndc r ys t a l l i z a t i ont husa i di ngwe a t he r i ng. Be ne f i t sofwe a t he r i ngt ope opl e . Cr e a t e st our i s ta t t r a c t i onsf ore xa mpl et heba l a nc i ngr oc ksi n Epwor t hdr a wr e gul a rc r owdsbr i ngi ngi nmuc hne e de di nc omet o t hec ommuni t ydwe l l e r s . I tpr oduc e ss oi lwhi c hi se s s e nt i a lf ora gr i c ul t ur a la c t i vi t i e s , bi odi ve r s i t ya n dde ve l opme ntofve ge t a t i on. ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rpr oc e s s e s : Ba s i cConc e pt s . Ri ve r sa r epe r ha pst hemos ti mpor t a ntde nuda t i ona ge nt . The yc a r vec ha nne l s ,f or mva l l e ys , t r a ns por ta ndde pos i tr e gol i t h ove rgr e a tdi s t a nc e sa ndot he rma t e r i a lt of or mot he rt ype sof l a ndf or ms . Te r msus e di nde s c r i bi ngar i ve rc ha nne l . Ac ha nne li sa na r e at ha tc ont a i nsf l owi ngwa t e rc onf i ne dbyb a nks . Cha nne lwi dt hi st hedi s t a nc ei nme t e r sa c r os st hes ur f a c eofar i ve r , i ti st hedi s t a nc ebe t we e nt het wob a nksi . e .t hedi s t a nc ef r omba nk t ot heot he r . De pt hi st hedi s t a nc ei nme t e r soft hel e ve lofwa t e rdownt ot h e r i ve rbe d.Thi si st heve r t i c a ldi s t a nc ef r omt hes ur f a c et ot hebe d. Gr a di e nt / Sl opei st hea ngl ebe t we e nt hehor i z ona ndt her i ve r ’ s s ur f a c e . Ve l oc i t yi st hes pe e da twhi c ht hewa t e rf l owst hr ought hec ha nne l . Spe e di sl owa tt hes i de sne a rt heb a nksa nda tt her i ve rbe dduet o f r i c t i ona ndhi ghe s ta tt hec e nt e r . Thes our c ei swhe r et h er i ve rbe gi ns . Themout hi swhe r ear i ve re mpt i e s / e ndsus ua l l yi nt oal a ke ,s e aor oc e a n. Fl owofwa t e ri ns t r e a ms Ri ve r sa l wa ysf l owdowns t r e a mbe c a us eoft hepul lofgr a vi t y . Ar i ve r ’ se r os i on,t r a ns por ta ndde pos i t i onde pe ndsont hef l owof wa t e ri ni t sc ha nne l . Thi sf l owi sde t e r mi ne dbys e ve r a lf a c t or svi z : Thee ne r gywhi c hi spr ovi de dbygr a vi t ya ndi sa f f e c t e ddi r e c t l yby t he ygr a di e ntoft her i ve r ’ sbe dt hes t e e pe rt hes l opet hemor e e ne r gyar i ve rha s . Vol umei st hea mountofwa t e ri nar i ve r ’ sc ha nne l .Vol ume i nc r e a s e sdur i ngt hewe ts e a s onswhe nmos toft hepr e c i pi t a t i on oc c ur sori far i ve r ’ sc our s epa s s e st hr oughar e gi one xpe r i e nc i ng we tc l i ma t i cc ondi t i ons Conve r s e l yar i ve r ’ svol umef a l l sdur i ngdr ys e a s onss uc ha s wi nt e ra nds pr i ngi nZi mba bweori fi tpa s s e st hr ougha r i d c ondi t i ons / r e gi onse xpe r i e nc i ngdr yc ondi t i ons . Thena t ur eoff l owa l s oa f f e c t sa ndc ha nne ls ha pea l s oa f f e c ta r i ve r ’ se ne r gy. ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rPr of i l e Ri ve r sc a nbes t udi e df r omt woa s pe c t svi z : Thel ongpr of i l e t hi si st hec r os ss e c t i ona l ongt her i ve r ’ se nt i r e l e ngt hf r omi t ss our c et oi t smout h. Thes hor tpr of i l e t hi si st hec r os ss e c t i ona c r os sar i ve r ’ sva l l e y f r omt hec r e s tl i ne (ononeba nk)t ot hec ha nne lt ot heot he r c r e s tl i ne .Thi si sknowna st her i ve r ’ sva l l e y. The r ei sonl yonec r os spr of i l ebuta ni nnume r a bl es hor tpr of i l e s t ha tc a nbet a k e na ta n ypoi nti nar i ve r ’ sl e ngt h. Thes hor tpr of i l ehowe ve rt e ndst owi de nt hef ur t he ronemove s downs t r e a m. Thedi a gr a ma boves howst het hr e ema i ns e c t i onsofa r i ve r / s t r e a m’ sl ongpr of i l ea ndt hedi a gr a mbe l ows howst he c or r e s pondi ngt ypi c a ls hor tpr of i l e sa te a c hs t a ge . Shor tpr of i l e st ha tc or r e s pondt ot hel ongpr of i l e . Ar i ve r ’ sl ongpr of i l ec a nbedi vi de di nt ot hr e es e c t i onsvi z : t heuppe rc our s eorhe a dwa t e rr e a c he s ,t hemi ddl ec our s eor mi ddl er e a c he s ,t hel owe rc our s eo rt hel owe rr e a c he s . Theba s el e ve lofar i ve ri st hel owe s tpoi ntar i ve rc a ne r odei t s c ha nne l ,t hi si se qua lt ot hes e al e ve loft heoc e a ni nt owhi c ht he r i ve re mpt i e s . Uppe rc our s e i tha sas t e e pgr a di e nt ,l e s svol umeofwa t e r ,t he r ei se ddyi nga nd s pl a s hi nga st h ewa t e rf l owst ur bul e nt l y. Commonf e a t u r e si nc l ude : Vs ha pe dna r r owva l l e ys ,pot hol e s , i nt e r l oc ki ngs p ur s ,wa t e rf a l l sa ndr a pi ds ,gor ge s ,s t r e wnboul d e r s . Themos tdomi na ntf or mofe r os i oni sve r t i c a le r os i ona nd he a dwa r de r os i ona l s ot a ke spl a c e . Mi ddl ec our s e I t sl e s ss t e e p,ha smor ewa t e rvol ume ,awi de rc ha nne la ndmor e ve l oc i t yduet or e duc e dc ha nne lr oughne s s . Commonf e a t u r e si nc l ude :Ope nVs ha pe dva l l e ys ,t r unc a t e ds pur s , me a nde r s ,oxbowl a ke sa ndbr a i ds . Er os i oni smos t l yi nt hef or mofl a t e r a le r os i on. Lowe rc our s e I sf l a ta ndha save r ywi dec ha nne lwi t hl e s se ne r gy. Commonf e a t u r e si nc l ude :bl uf f sa ndot he rf l oodpl a i nf e a t ur e s s uc ha ss wa mps ,br a i d i ng,de l t a s ,a l l uvi a lf a ns ,de f e r r e dj unc t i ons a ndna t ur a ll e ve e s . The s ef e a t ur e sa r emos t l yduet ode pos i t i onwhi c hi smor e domi na ntt ha ne r os i onduet ot her e duc e dr i ve re ne r gyduet ot he l owe rgr a di e nta ndi nc r e a s e dwe t t e dpe r i me t e r . ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rEr os i on Ri ve re r os i oni nvol ve st hewe a r i nga wa yofr oc ka nds oi lf ound a l ongt her i ve rbe da ndba nks . I ta l s oi nvol ve st hebr e a ki ngdownoft her oc kpa r t i c l e sbe i ng c a r r i e ddowns t r e a mbyt her i ve r . The r ea r ef ourma i npr oc e s s e sofe r os i on. The s ea r ec or r a s i on,a t t r i t i on,hydr a ul i ca c t i ona nds ol ut i on( a l s o knowna sc or r os i on) . Cor r a s i on I st hewe a r i ngdownoft hes i de sa ndbe doft her i ve rbyt hel oa da s i ti sbe i ngt r a ns por t e dbyt her i ve r . Cor r a s i onoc c ur swhe nar i ve rpi c ksupma t e r i a la ndr ubsi t sb e d a ndba nkwe a rt he ma wa ybya br a s i onl i kes a ndpa pe r . Cor r a s i ont he r e f or eha ppe nswhe nt her i ve r ’ ss i de sa ndbe da r e s c r a ppe dof fbyt hema t e r i a lbe i ngt r a ns por t e dbyt her i ve r . Thi spr oc e s si smos tp r onounc e ddur i ngf l oodi ng. Thi si st hema j orme a nsofe r os i onbywhi c har i ve re xt e ndsbot h ve r t i c a l l ya ndhor i z ont a l l y. I ft he r ea r ehol l owsi nt her i ve rbe d ,pe bbl e sc a nge tt r a ppe di n t he s ea ndwhi r l e dbyt ur bul e nte dd i e s( i nc i r c ul a rmot i on)t of or m pot hol e s . Whe npe bbl e sa r et r a ppe di ne xi s t i ngpot hol e st he s ea r ede e pe ne d f ur t he rbyt hewhi r l i ngpe bbl e s . Cor r a s i onwe a r sa wa yt hec ha nne l ’ sr i ve rbe da nda ddmor e ma t e r i a lt ot her i ve r ’ sl oa dt husa mpl i f yi ngt hepr oc e s s e sa smor e l oa dme a nsmor ec or r a s i on. At t r i t i on I sapr oc e s sbywhi c ht her i ve r ’ sownl oa di sbr oke ndownf r om l a r ge rpa r t i c l e si nt os ma l l e rone s . Thi sha ppe nsbe c a us et her i ve r ’ sl o a dwhi c hi sma deupof di f f e r e nts i z e dpa r t i c l e swhi c hc ol l i dea ndknoc ki nt oe a c hot h e r c a us i ngt he mt obr e a ki nt os ma l l e rf r a gme nt s . Ast hel oa dpr ogr e s s e sdowns t r e a mi tge t ss ma l l e ra nds ma l l e r . Al s oa ngul a rr oc ksbe c omei nc r e a s i ngl yr ounde d. Hydr a ul i cAc t i on r e f e r st ot hes he e rf or c ea ndt ur bul e nc eoft hemovi ngwa t e rwhi c h c a nbea bl et or e movel oos ema t e r i a ls uc ha sgr a ve l ,s a nda nds i l t . Thi sf or c ec a na l s owe a ke ns ol i dr o c ksbys ur gi ngi nt oc r a c ksi n t her oc k. Thi spr oc e s s e sc a nbea i de dwhe nt he r ei sa i ri nt hec r a c kswhi c hi s c ompr e s s e dc a us i nge ve nt ua lba nkc ol l a ps e . Ca vi t a t i oni saf or mofhydr a ul i ca c t i onc a us e dbybubbl e sofa i r c ol l a ps i nga ndt her e s ul t a nts hoc kwa ve shi ta ndwe a ke nt heb a nks oft her i ve r . Hydr a ul i ca c t i onbyi t s e l fi sve r ye f f e c t i vei ft her i ve rdoe snot ha ves omel oa dt opr oduc ec or r os i vee r os i on/ a br a s i vee r os i on. Hydr a ul i ca c t i oni st hewe a ke s ta ndl e a s te f f e c t i vef or mofe r os i on. Sol ut i onorCor r os i on Thewa t e ri nt her i ve rdi s s ol ve ss omes ol ubl er oc kss uc ha sr oc k s a l ta nds ome t i me sl i me s t one . Thi si smos te f f e c t i vei na r e a swhe r et hes t r e a mbe da ndba nksa r e c ompos e dofs ol ubl er oc kf ore xa mpl ei nl i me s t oner e gi ons . Thi sme t hodofe r os i o nt a ke spl a c ea l lt het i mea ndi si nde pe nde nt ofar i ve r ’ sve l oc i t yordi s c ha r ge . I ti ss i mi l a rt ot hec he mi c a lwe a t he r i ngpr oc e s sofs ol ut i on. Ther i ve r ’ sc or r os i vea bi l i t yi sa i de d,howe ve r ,i ft he r ea r ea c i d s wi t hi ni t . For msofEr os i on Thea bovef ourpr oc e s s e sma keupar i ve r ’ se r os i onpr oc e s s e s . Ri ve re r os i ont a ke spl a c ei nt hr e ewa ys : He a dwa r de r os i on,l a t e r a le r os i ona ndve r t i c a le r os i on. He a dwa r dEr os i on I st hepr oc e s s e sbywhi c har i ve ri nc r e a s e si t sl e ngt hups t r e a m. Thi si sa c hi e ve dbyar i ve rc ut t i ngba c ka ti t ss our c e . Ra i nwa s ha nds oi lc r e e pa r eot he rpr oc e s s e sbywhi c har i ve r e xt e ndsi t sc ha nne lupt hes l ope . La t e r a lEr os i on For msofEr os i on,Upa r r ows howshe a d wa r de r os i on,t het woa r r ows l a t e r a le r os i on/ wi de ni ngorc ha nne la ndt hedownpoi nt i na r r owve r t i c a l e r os i on.I ma geCr e d i tWi ki Commons Thepr oc e s s e sbywhi c ht her i ve r ’ ss i de sa r ewor na wa ya ndt he c ha nne lbe i nge xt e nde di nwi dt h. Thi si smor epr onounc e da l ongt hebe nds( out s i deba nks )of me a nde r s . Ve r t i c a lEr os i on Thi si sapr oc e s sbywhi c har i ve rde e pe nsi t sc ha nne l . ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rTr a ns por t a t i onPr oc e s s e s . Anye ne r gyl e f ta f t e rar i ve rha sove r c omef r i c t i oni sus e dt o t r a ns por ts e di me nt . Thi se ne r gyva r i e sdi r e c t l ywi t har i ve r ’ sdi s c ha r ge ,ve l oc i t ya nd t ur bul e nc e Tha ti si ft he yi nc r e a s et hea mountofar i ve r ’ se ne r gyt oe r odea nd t r a ns por ta l s oi nc r e a s e sunt i lar i ve rr e a c he sf l oodi ngl e ve lwhe n de pos i t i oni sl i ke l yt ooc c urduet oa ni nc r e a s ei nt hewe t t e d pe r i me t e ra ndt husf r i c t i on. The r ea r et hr e ema i npr oc e s s e sbywhi c har i ve r ’ sl oa di s t r a ns por t e d: s us pe ns i on,s ol ut i ona ndbe dl oa d( s ome t i me sdi vi de di nt os a l t a t i on a ndt r a c t i onma ki ngt he mf ourme t hodsi ns t e a doft hr e ei nt hi s c a s e ) . Sus pe ns i on Thi si swhe nl i ghts i l ta ndmudf l oa t sa l ongwi t ht hewa t e r . Ve r yf i nepa r t i c l e sofs i l ta ndc l a ya r edi s l odge da ndc a r r i e da wa y i nt het ur bul e nc eoft hef l owi ngwa t e r . Thegr e a t e rt het ur bul e nc et hegr e a t e rl a r ge rt hequa nt i t ya nds i z e ofpa r t i c l e spi c ke dupbya ndc a r r i e da wa ybyt her i ve r . Thi spa r t l ye xpl a i nswhyf l oode dr i ve rof t e nha vemudc ol our e d wa t e r ,i ti sduet ot hehe a vya moun t sofs us pe nde dma t e r i a lwi t h t hewa t e r . Thes us pe nde dma t e r i a lus ua l l yf or mst hel a r ge s tpa r tofar i ve r ’ s t ot a ll oa d. I ti nc r e a s e si na mountt owa r dsar i ve r ’ smout ha l s ogi vi ngt he bl a c k/ br owni s hc ol ourt ot hewa t e rt ha ti ss i mi l a rt ot ha tofmo s t r i ve r sa f t e ras t or m. Sol ut i on/ Di s s ol ve dLoa d I swh e nma t e r i a ldi s s o l ve si nt hewa t e ra ndi sc a r r i e da wa yi n s ol ut i onf or mf ore xa mpl er oc ks a l t . Fl owi ngwa t e rwi t hi nr i ve rc ha nne l sa l mos ta l wa ysc ont a i na c i dsi n t hef or mc a r bo ni ca ndni t r ousa c i dse s pe c i a l l ya f t e ras t or mordue t opol l ut i on. Thi sdi s s ol ve st hebe dr oc ke s pe c i a l l yi fi ti ss ol ubl ef ore xa mpl e l i me s t one . I tdi s s ol ve si nwa t e ra n di sc a r r i e da wa yi ns ol ut i onf or m. Thi si save r ya c t i vef or moft r a ns por t a t i oni nl i me s t oner e gi on s a ndi not he rr e gi onsi tf or msac ompa r a t i ve l ys ma l lpa r toft hel oa d. Be dl oa d I sdi vi de di nt ot wopr oc e s s e st r a c t i ona nds a l t a t i on. Sa l t a t i oni swhe ns ma l l e rpa r t i c l e sbounc ea l ongt hebe doft he r i ve r . Tr a c t i oni swhe nl a r ge rboul de r sa n dpe bbl e sr ol la nda r edr a gge d a l ongt her i ve r ’ sbe d. Si nc el a r ge rpa r t i c l e sc a nnotbepi c ke dupbyt hec ur r e ntt he ya r e move da l ongt h ebe doft her i ve ri nt he s et wowa ys . Sa l t a t i onha ppe nswhe npe bbl e s , s a nda ndgr a ve la r et e mpor a r i l y l i f t e dupbyt her i ve r ’ sc ur r e nta ndbounc e da l ongt hebe doft he r i ve ri nahoppi ngmot i on. Tr a c t i onoc c ur swhe nt hel a r ge s tc o bbl e sa ndboul de r sr ol lors l i de a l ongt hebe doft her i ve r . Thel a r ge s tl oa dsc a nonl ybemove di nt hi swa ydur i ngf l ood pe r i odsf ore xa mpl ea f t e ras t or m. ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rde pos i t i on De pos i t i onoc c ur swhe nar i ve rnol onge ra ss uf f i c i e nte ne r gyt o t r a ns por ti t sl oa d. Whe ni t sve l oc i t ybe gi nst of a l la ndha sl e s se ne r gy,ar i ve r ’ s c ompe t e nc e( ma xi mums i z eofma t e r i a lwhi c har i ve ri sc a pa b l eof t r a ns por t i ng)a ndc a pa c i t y(ma xi muma mountofl oa dt ha tar i ve r i sc a pa bl eoft r a ns por t i ng)f a l l sa ndt he r e f or ede pos i t i onbe gi n s . De pos i t i onoc c ur swhe n: Di s c ha r gei sr e duc e da f t e rape r i odofl owpr e c i pi t a t i on. Ve l oc i t yi sr e duc e dupont her i ve rr e a c hi ngt heda m,l a ke , s e aor oc e a nr e s ul t i ngi nt hef or ma t i onofde l t a s . Sha l l owwa t e roc c ur sont hei ns i des e c t i onofame a nde rf or e xa mpl e . Thel oa di ss udde nl yi nc r e a s e df ore xa mpl ei nt hee ve ntofa l a nds l i def ori ns t a nc ewhe napor t i onofba nkc ol l a ps e si nt ot he r i ve r . Whe nt her i ve rove r f l owsi t sba nkss ot ha tt heve l oc i t yout s i det he c ha nne li sr e duc e dr e s ul t i ngi nt hef or ma t i onofaf l oodpl a i n. Dur i ngf l oods ,e s pe c i a l l yi nt hel owe rc our s er i ve r ss pr e a dt ot he s i de soft hec ha nne l . Fr i c t i ona ldr a ga ndt her e duc e dgr a di e nts l owdownt hef l owi ng wa t e rr e s ul t i ngi nde pos i t i on. De pos i t i onoc c ur sa l on gt hee nt i r ec our s eoft her i ve r : 1.Ont hec ha nne lbe d. 2.Ther i ve rva l l e yf l oore s pe c i a l l ydur i ngf l oods . 3.Ont her i ve r ’ sba nksa si name a nde r . 4.Att her i ve r ’ smout hwhe ni te mpt i e si nt ot hes e a . NBDe pos i t i onoc c ur sa ta nypa r tofar i ve r ’ sc our s ede pe ndi ngona r i ve r ’ se ne r gya ndve l oc i t y.Thedi vi s i onofar i ve ri nt os t a ge si s t he r e f or eus e f ulbutbynome a nsc onc l us i ve . De pos i t i on Whe nt her i ve rl os e si t se ne r gyt oa nyoft her e a s onspoi nt e dout a bovet hef ol l owi ngha ppe ns . Thehe a vi e s tma t e r i a l / l oa di sde pos i t e df i r s tt hi si swhyr i ve r sa r e l i t t e r e dwi t hboul de r si nt heuppe rc our s e . Thi si sbe c a us et r a c t i onl oa da nds i l t a t i onl oa dsr e qui r emor e e ne r gyt ot r a ns por t . Thef i ne s tma t e r i a li sde pos i t e dl a s ta ndma yr e a c ht hes e awhe r ei t i sde pos i t e dont oa ndt of or mde l t a s . Thedi s s ol ve dl oa dwhi c hi si ns ol u t i onwa t e ri sde pos i t e da ta l lbut t r a ns por t e dt ot hes e awhe r ei tma i nt a i nst hes a l t i ne s sofoc e a ns . Thede pos i t i onofs a nda nds i l tl e a d st ot hede ve l opme ntofa ge nt l ys l opi ngpl a i nknowna saf l oodpl a i n. De pos i t i onc a nr e s ul ti na ggr e da t i o nwhe r et her i ve r ’ sbe da nd gr a di e nta r ei nc r e a s e d.Thi sc a nha ppe na tde l t a sa ndona l l uvi a l f a ns . ZI MSECOLe ve lGe ogr a phyNot e s Thef ol l owi ngf a c t or sa f f e c tt her i ve r ’ se ne r gya nda bi l i t yt oe r ode , t r a ns por ta ndd e pos i ti t sl oa d. Typeoff l ow,gr a di e ntofc ha nne l , vol ume / di s c ha r ge ,c r os s s e c t i ona lc ha nne ls ha pe ,c ha nne lr oughne s s . Typeoff l ow Whe nwa t e rf l owsdownhi l lunde rgr a vi t yi tf ol l owst hepa t ho f l e a s tr e s i s t a nc e . The r ea r et wopa t t e r nsoff l ow:l a mi na ra ndt ur bul e nt . La mi na r i sahor i z ont a lmove me ntofwa t e ri nar i ve rwi t hmi ni ma l ve r t i c a lmi xi ng. Thewa t e ri si nl a ye r ,s uc haf or mo ff l owwoul dr e s ul ti nmi ni ma l e r os i ona ndmor ede pos i t i on I nr e a l i t ys uc hat ypeoff l owdoe snote xi s ta l t houghs ome t hi ng c l os et ot hi sc a nbeobs e r ve di nf l a tt e r r a i nwhe nr i ve r sa r e r e l a t i ve l yc a l mdur i ngt he i rf l ow. Tur bul e ntf l owc ons i s t sofas e r i e sofve r t i c a la ndhor i z ont a le ddi e s a ndal otofve r t i c a lmi xi ngoft hewa t e ra si tf l owsdownhi l l . Tur bul e ntf l owr e s ul t si nmor ee r os i ona ndt r a ns por t a t i ona ndt hi s f or moff l owi nc r e a s e swi t ha ni nc r e a s ei nar i ve r ’ se ne r gy. Gr a di e ntoft hec ha nne l Thegr a di e ntoft hec ha nne lde t e r mi ne sar i ve r ’ sa bi l i t yt oe r ode , t r a ns por ta ndd e pos i ti t sl oa d. Theuppe rc our s eofar i ve ri sa s s oc i a t e dwi t hs t e e pgr a di e nt s t he r e f or eal otofve l oc i t ya nde ne r gya ndt he r e f or er i ve re r os i on a ndt r a ns por t a t i ont a ke spl a c ei nt heuppe rc our s e . Themi ddl ea n dl owe rc our s eha veamuc hge nt l e rgr a di e nta nd t he r e f or et hes l owe rmovi ngwa t e r sha vel e s se r os i vepowe ra nd t he r e f or emor ede pos i t i ont a ke spl a c ea ndl e s st r a ns por t a t i ona nd e r os i on. Di s c ha r ge / Vol ume Asa l r e a dys a i d,wa t e rf l owsi nr e s pons et ot hepul lofgr a vi t y whi c hi sa l s ode t e r mi ne dbyt hema s sa ndi nt ur nt hevol umeoft he movi ngwa t e r . Ri ve r sha vel e s swa t e ri nt heuppe rc our s ebe c a us eofmos tha ve f e we rt r i but a r i e sa tt hi ss t a get he r e f or et he yha vel e s se ne r gyt o e r ode . Mi ddl ec our s ea ndl owe rc our s er i ve rs e c t i onsha vehi ghe r vol ume sofwa t e rs i nc et he yha vemor eups t r e a mt r i but a r i e sa tt hi s s t a ger e s ul t i ngi nmor ee ne r gyt ot r a ns por ta nde r odea ndt r a ns por t i nt e r msofwa t e rvol ume . Cr os sSe c t i ona lCha nne ls ha pe . Cha nne lAha sal a r ge rwe t t e dpe r i me t e rwhi c hme a nsmor e f r i c t i ona ndl e a ve sl e s se ne r gyt oe r odei t sbe da ndt ot r a ns por tl oa d. Cha nne lBha sas ma l l e ras ma l l e rwe t t e dpe r i me t e rr e s ul t i ngi n mor eve r t i c a le r os i onbe c a us ei tha smor ee ne r gyl e f tove rf r om ove r c omi ngf r i c t i on. I nt e r msofc ha nne lc r os ss e c t i onuppe rc our s es t r e a msha vemor e e ne r gyt oe r odewhe nc ompa r e dt ol owe ra ndmi ddl ec our s e s t r e a ms . Cha nne lRoughne s s Cha nne lr oughne s sc ha nne lA)i st ypi c a li nt heuppe rc our s es t r e a msa nd B)i nt hel owe rc our s es t r e a ms Uppe rc our s es t r e a mse nc ount e rmor ef r i c t i onduet ot he i rr oug h c ha nne l swhi c ha r ear e s ul tofpr ot r udi ngboul de r sa ndr oc ky out l i ne s .Thi sme a nss uc hc ha nne l swi l lha vel e s se ne r gyl e f tove r t oe r odea ndt r a ns por tt he i rl oa d. Mi ddl ea ndLo we rc our s es t r e a msha vemor ee ne r gyt ot r a ns por t a nde r odes i nc et he yha ves moot hc ha nne l sr e s ul t i ngi nl e s sf r i c t i on. Conc l us i on Mor ee r os i ont a ke spl a c ei nt hemi ddl ec our s es i nc et hec ha nne l s a r es moot h,t hegr a di e nts t e e pe rt ha ni nt hel owe rc our s e ,t he we t t e dpe r i me t e rs ma l l e rt ha ni nt hel owe rc our s ea ndt hevol u me ofwa t e ri shi gh . Al otofve r t i c a le r os i o nt a ke spl a c ei nt heuppe rc our s e . Mos tde pos i t i ont a ke spl a c ei nt hel owe rc our s eoft her i ve rs i nc e t hegr a di e nti ss ma l l e r ,t hewe t t e dpe r i me t e rl a r ge r ,a ndt he gr a di e ntc ons i de r a bl yl e s ss t e e pwhe nc ompa r e dt ot heot he rt wo c our s e s . NBI ti si mpor t a ntt or e me mbe rt ha tt hi si sage ne r a l i s e da ppr oa c hs i nc e e r os i on,de pos i t i ona ndt r a ns por t a t i onc a nt a kepl a c ei na nypa r toft he c our s eduet ova r i ou sc i r c ums t a nc e sr e ga r dl e s soft hec our s eoft her i ve r . ZI MSECGe ogr a phyNot e s :La ndf or msr e s ul t i ngf r omr i ve rpr oc e s s e s Topi c sl i nke dt ot hi spa gea r ec ur r e nt l yb e i nge di t e da ndma yc ha nge a ppe a r a nc eorbeuna va i l a bl e . Ar i ve rt hr oughi t spr oc e s s e sofe r o s i on,t r a ns por t a t i ona nd de pos i t i onf or mss e ve r a ll a ndf or ms . The s ec a nbebr oa dl ydi vi de di nt ot hos el a ndf or msr e s ul t i ngf r om e r os i ona ndde pos i t i on . La ndf or msr e s ul t i ngma i nl yf r ome r os i o n 1.Na r r owva l l e ys 2.I nt e r l oc ki ngs pur s 3.Wa t e r f a l l sa ndr a pi ds 4.Pothol e s 5.Gor ge s Thos er e s ul t i ngf r omma i nl yde pos i t i on 1.Fl oodPl a i ns 2.Me a nde r s 3.Oxbowl a ke s 4.Br a i ds 5.Le vé e s 6.De l t a s Cl i c kone a c honet ol e a r nmor ea bouti ta ndwhe r ei ti smos tl i ke l yt obe f or me di nar i ve r ’ sc our s e . I ti si mpor t a ntt onot et ha tt h i sdi vi s i oni nt ol a ndf or msa se i t he rr e s ul t i ng f r omde pos i t i onore r os i oni snotha r da ndf a s ta si twoul da ppe a r .For e xa mpl eal otofr i ve rf e a t ur e ss uc ha sf l oodpl a i nsa ndme a nde r sa r e f or me dbybot he r os i ona ndde pos i t i ona c t i ngi nt a nde m. Al s omi norr i ve rf e a t ur e ss uc ha sbl uf f s( s ome t i me sknowna sr i ve rc l i f f s orbl uf fl i ne s ) ,poi ntba r s ,po ol sa ndr i f f l e sa r ei nc l ude di nt he de s c r i pt i onsofr i ve rl a ndf or mst ha tt he ya r eof t e na s s oc i a t e dwi t h. ZI MSECOLe ve lGe ogr a phyNot e s :Fl oodpl a i nsa ndLe ve e s Fl oodpl a i n The s ea r et ypi c a l l yf oundi nt hemi ddl ea ndl owe rc our s es e c t i ons oft her i ve r . The ya r ege nt l ys l opi ngs ur f a c e sofa l l uvi umt ha tr e s ul tf r om l a t e r a le r os i ona ndma t e r i a lde pos i t e dont ot heva l l e yf l oor . Af l oodpl a i nc ommonl yha st hef o l l owi ngr i ve rf e a t ur e sa l l uvi um, ma r s he s ,me a nde r sa n doxbowl a ke swhi c ha r er e mna nt sofc utof f me a nde r s . Whe nar i ve ri si nf l oodi tove r f l owsi t sba nksa ndc ove r st he whol epl a i nup onwhi c hi tde pos i t ss omeofi t sl oa d. Thec ont i nua lde pos i t i onr e s ul t si nt hef or ma t i onofl e ve e s . The s ea r er i dgel i kef e a t ur e sr e s ul t i ngf r omde pos i t i on. Fl oodpl a i nsma ybe c omes ol a r gea ndwi det het hee dge soft he me a nde r sma ynotbea bl et or e a c ht hes i de soft heva l l e yf or e xa mpl et heNi l eRi ve ra ndt he( Ye l l owRi ve r )Hua ngHo. I nme a nde r sbot hl a t e r a la ndve r t i c a le r os i ont a ke spl a c er e s ul t i ng i nt her e mova loft heor i gi na lf l ood pl a i na ndt hef or ma t i onofa ne wone . Thepi e c e st ha ts ur vi v et hee r os i onf or mt e r r a c e swhi c hha ve va r yi nghe i ght sa ndof t e nt i me st hehe i ght soft e r r a c e smi ghtnot ma t c ht hos eont heot he rs i de . Thi sdi f f e r e nt i a t e st he s et e r r a c e sf r omt heone sf or me dbyr i ve r r e j uve na t i on. Ther i ve rBe nueha sawe l lde ve l op e df l oodpl a i n. I ti si mpor t a ntt onot et ha tf l oodpl a i nsa r ebot hade pos i t i ona la nd e r os i ona lf e a t ur e . Na t ur a lt e r r a c e sr e s ul t i ngf r oms uc c e s s i vee r os i onoff l oodpl a i ns .I ma ge c r e di tKe nt . e du Le ve e sa ndt r i but a r i e swi t hde f e r r e dj unc t i ons Fl oodi ngc a us e sde pos i t i ont ot a kepl a c eonar i ve r ’ sba nksbe c a us e t hewa t e ri ss l owe rt he r ea ndt he r e f or eha sl e s se ne r gyt ot r a ns por t t hel oa d. Asa l r e a dys a i da bove ,c ont i nue df l oodi ngr e s ul t si nt hef or ma t i on ofr a i s e dba nks . The s er i dge sa r eknowna sna t ur a ll e ve e s . Mos tf l oodi ngt a ke spl a c ea tt hee d ge soft hec ha nne ls i nc et he wa t e ri ss l owe r Ther i ve rt he nf l owsa bovet hel e ve loft hef l oodpl a i nwhi c hc a us e s t r i but a r i e st ode f e rj oi ni ngwi t ht hema i ns t r e a m. Tr i but a r i e sf l owpa r a l l e lt ot her i ve r ,wi t hs omef l owi ngi nt o de pr e s s i onsr e s ul t i ngi nt os wa mps , whi l eot he r se ve nt ua l l yj oi nt he ma i nr i ve rf ur t he rdowns t r e a mf or mi ngwha ta r eknowna s de f e r r e dj unc t i ons . Ri ve r st ha tf l owa bovet hef l oodpl a i npr e s e ntgr e a tr i s kof f l oodi ngt one a r bys e t t l e me nt sf ore xa mpl et he( Ye l l ow Ri ve r ) Hua ngHoi nChi naa ndt heMi s s i s s i ppii nt heUni t e dSt a t e s . Swa mps / Ma r s he s Thi si ss t a gna ntwa t e rt ha ti sc l ogge dwi t hwa t e rl ovi ngve ge t a t i on. The yoc c uri nt hef l oodpl a i nduet of r e que ntf l oodi nga ndwhe r e t r i but a r i e sf a i lt oe nt e rt hema i ns t r e a m( i . e .de f e r r e dj unc t i ons whe r eat r i but a r yf l owsove rade pr e s s i on) . Bl uf f s Thi si sapr omi ne nts l opet ha tma r kt hee dgeofaf l oodpl a i n. The s es t e e ppr omont or yc l i f f sa r es ome t i me sf oundont heout s i de be ndofame a n de r . ZI MSECOLe ve lGe ogr a phyNot e s :Me a nde r sa ndOxbowl a ke s Me a nde r s Me a nde r sa r epr onounc e dbe ndsi nar i ve r ’ sc our s e The ya r ef or me dwhe nar i ve rt wi s t sa ndt ur ni nwi debe nds . The ya r ec ommonont hef l oodpl a i nbutc a nde ve l opi na nypa r tof t her i ve r ’ sc our s e . Me a nde r i ngi sac ommonbe ha vi ou roff l ui dst ha ta voi das t r a i ght pa t ht of l owi nat wi s t i nga ndt ur ni ngpa t h. I ti sbe l i e ve dt ha tme a nde r i ngi sat he r modyna mi c sbe ha vi ourt ha t ma xi mi z e sve l oc i t ya ndr e duc e sf r i c t i on. Ot he re xpe r t sha vet he or i z e dt ha tMe a nde r ss t a r twhe nf r i c t i on wi t ht hec ha nne lbe da ndba nksc a us e st ur bul e nc ei nt hewa t e rf l ow. Thi sr e s ul t she l i c oi da lf l ow. Thi si sac or ks c r e wl i kemove me ntoft hewa t e ra si ts pi r a l s downs t r e a mf r omba nkt oba nka ss howni nt hedi a gr a ma bove . Thi sof t e noc c ur sdur i ngf l oodsa ndr e s ul t si nt hef or ma t i onof me a nde r sa ndt he i ra s s oc i a t e df e a t u r e ss uc ha spool sa ndr i f f l e s . He l i c oi da lf l owi name a nde ra ndt her e s ul t i ngf e a t ur e sa te a c hpoi nt . I ma gec r e di tWor dPr e s s . c om Pool sa ndr i f f l e s Pool t hi si sad e e ps e c t i oni name a nde rwhe r eal otofe r os i on t a ke spl a c ewh e r et her i ve r ’ se ne r gybui l dsupduet or e duc e d f r i c t i ona ndt hewa t e rha shi ghe rve l oc i t y. Ri f f l e t hi si sas ha l l ows e c t i oni nar i ve rwhe r et he r ei sde pos i t i on duet or e duc e dc a pa c i t yi nar i ve rr e s ul t i ngf r ome ne r gydi s s i pa t i on ( r e duc t i on)i nar i ve rduet oi nc r e a s e df r i c t i ona ndar e duc t i oni na r i ve r ’ sve l oc i t y. Thes pa c i ngoft hepool sa ndr i f f l e sa r ef a i r l yr e gul a ri nar i ve r c ha nne la bouts i xt of i vet i me st hewi dt hoft hec ha nne l . He l i c oi da lf l owi sr e s pons i bl ef ort hee r os i onont heout s i debe nds a ndt he nde pos i t i ngi ti nt ot hei ns i d ebe ndsofme a nde r s . Poi ntba r sa ndme a nde rc r os ss e c t i on Wa t e rf l owsf a s t e s tont heout e rbe nd( c onc a veba nk)oft her i ve r whe r et hec ha nne li sde e pe ra ndt he r ei sl e s sf r i c t i on. I te r ode st hi sba nkl a t e r a l l ybya t t r i t i ona ndhydr a ul i ca c t i on. The r ea l s ove r t i c a le r os i onwhi c hde e pe nst hec ha nne l ,whi c h r e duc e sf r i c t i ona ndi nc r e a s e si ne ne r gyr e s ul t si nf ur t he re r os i on. Thel a t e r a le r os i onr e s ul t si nunde r c ut t i ngoft her i ve rba nka ndt he f or ma t i onofas t e e ps i de dr i ve rc l i f ft he s ec l i f f sa r ea l s oknowna s bl uf f s . t hei nne rbe ndwa t e ri ss l owf l owi ng,duet oi tbe i ngal owe ne r gy z one ,de pos i t i onoc c ur sr e s ul t i ngi nas ha l l owe rc ha nne l . Thi si nc r e a s e df r i c t i onf ur t he rr e du c e st heve l oc i t y( t husf ur t he r r e duc i nge ne r gy) ,e nc our a gi ngf ur t he rde pos i t i on. Ove rt i meas ma l lr i ve rbe a c horr unof fs l opebui l dsupont he i nne rbe nd. Thegr e a t e re r os i onoft hec onc a veba nkoc c ur sj us tdowns t r e a mof t hea xi soft heme a nde rbe nd,be c a us et hec our s eoft hema xi mum ve l oc i t yz onei nt hec h a nne ldoe snotr e f l e c tt heme a nde rs ha pe . Thi sc a us e sme a nde rt omi gr a t edo wnt heva l l e y. Thel a t e r a le r os i onoft heme a nde r sa ndt he i rmi gr a t i onwi de nt he f l oodpl a i n. Apoi ntba ri sade pos i t i ona lf e a t ur ema deofa l l uvi umt ha t a c c umul a t e sont hei ns i debe ndofs t r e a msa ndr i ve r sbe l owt h es l i p of fs l ope . The ya r ec r e s c e nt s ha pe da ndl oc a t e dont hei ns i deofas t r e a m be ndofme a nde r s . The ys howt hef or me rpos i t i onsofame a nde rdur i ngi t s downs t r e a mmi gr a t i on. Thet e r mi ss ome t i me sus e ds ynonymous l ywi t hs l i p0f fs l ope s a l t hought het e r ms l i pof fs l opei sus e dt or e f e rt ot hec r os ss e c t i on a ndt het e r mpoi ntba ri sus e dt or e f e rt ot hea e r i a lvi e w. Poi ntba r sa ndc utba nks ZI MSECOLe ve lGe ogr a phyNot e s :Wa t e r f a l l sa ndRa pi ds Wa t e r f a l l sa ndRa pi ds Wa t e r f a l l sc ommonl yoc c uri nt heuppe rc our s es e c t i onoft her i ve r a l t hought he yc a noc c ura ta nypa r ti nar i ve r ’ sc our s e . The r ea r eva r i ouswa y si nwhi c hawa t e r f a l l / r a pi dc a nbef or me d. As ha r pbr e a ki nt hebe dofar i ve rpr oduc e sawa t e r f a l l . Aba ndofr e s i s t a ntr oc kwi t have r t i c a lf a c eove r l yi ngl e s sr e s i s t a nt r oc kpr oduc e sawa t e r f a l lwhe ni ti se xpos e da tt hes ur f a c ebyr i ve r e r os i onc a na l s or e s ul ti nt hede ve l opme ntofawa t e r f a l l . Ar a pi di sf or me di ft h er oc kl i e sa tas t e e pa ngl ebuti snotve r t i c a l . Awa t e r f a l lc a na l s ode ve l opwhe nr e s i s t a ntr oc kove r l i e sal e s sr e s i s t a nt i shor i z ont a lordi psge nt l yupr i ve r . Ar a pi dmi ghtbef or me df i r s ti ns uc hi ns t a nc e sbutc ont i nue d e r os i ona tt heba s eoft hepoolwi l lr e s ul t i ngi nt ot her a pi d de ve l opi ngi nt oawa t e r f a l l . Ar a pi dde ve l opswhe nt her e s i s t a n tr oc k,ove r l yi ngal e s sr e s i s t a nt r oc kdi psge nt l ydownr i ve r . TheVi c t or i aFa l l sa r et hewi de s tf a l l si nt hewor l d. The yma yha vede ve l ope da sar e s u l toft her i ve rZa mbe z iupl i f tof a na l mos thor i z ont a lba s a l t i cpl a t e a u. Whe r ear i ve rf l owsa c r os sal i neo fwe a kne s si te r ode sve r t i c a l l y t of or mawa t e r f a l l . TheVi c t or i aFa l l sma ya l s oha veb e e nf or me di nt hi swa y. I tha sr e t r e a t e dups t r e a ma l ongf a ul tl i ne sa ndmi ghtc e a s et oe xi s t oneda y. Ar i ve rmi ghtd e s c e ndt hes c a r pi na r e a soff a ul t i ngr e s ul t i ngi na wa t e r f a l la tt hekni c kp oi nt . Awa t e r f a l lma ya l s obef or me dwh e r ear i ve rde s c e ndsf r oma hi ghl a nda r e a ( f ore xa mpl eapl a t e a u)i nt oal owl a nda r e a . Ar i ve rmi ghte r odeba c kwa r dst ounde r c uta nddi ve r tt hewa t e rof ane i ghbour i ngs t r e a ma ndt hepoi ntofc a pt ur ei sma r ke dbya wa t e r f a l l . Ane xa mpl ei st hePun gweFa l l swhi c hma r kst hepoi ntwhe r et he PungweRi ve rc a pt ur e dt hewa t e r soft heNya kupi ngar i ve rwhi c h i sat r i but a r yoft her i ve rOdz ii nt h eEa s t e r nHi ghl a nds . Pl ungepool s I sde e ppoolt ha ti sf or me da tt heba s eofwa t e r f a l l sduet he s wi r l i ngwa t e re r odi ngt heba s eoft hewa t e r f a l lvi ahydr a ul i c a c t i ona ndc or r a s i ona i de dbybi t soft heha r dr oc kt ha tf a l l si nt o t hepoola ndbe c ome spa r toft hel oa da ndt hee ddyi nga nd t ur bul e ntmot i o noft hewa t e ra tt heba s e . Ast heunde r c ut t i ngc ont i nue st hewa t e r f a l l smi gr a t eups t r e a m. ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rPr oc e s s e s :St r e a mba nk c ul t i va t i on St r e a mba nkc ul t i va t i onr e f e r st ot hepr a c t i c eofgr owi ngor c ul t i va t i onofc r opsne a rawe t l a nd ,s t r e a morr i ve r . SubSa ha r a nAf r i c aha sf a c e dpol i t i c a l ,s oc i oe c onomi cpr obl e ms i nt her e c e ntt i me s . The s epr obl e msha vebe e ni nbr oughta boutbye r r a t i cr a i nf a l l pa t t e r nsi nt her e gi on. I nZi mba bwe ,e r r a t i cr a i nf a l lpa t t e r ns ,l a c kofe mpl oyme nta nd pove r t yha sl e dt ot hec ul t i va t i onofs t r e a mba nks . Ane xa mpl eofa r e a st ha te xpe r i e nc eal otofs t r e a mba nk c ul t i va t i ona r et hepe r i ur ba na r e a sofSe ke Chi t ungwi z a . Cr opsa r egr ownmos t l yf ordome s t i cc ons umpt i ona l t hough hor t i c ul t ur a la c t i vi t i e ss uc ha sve ge t a bl egr owni ss ome t i me s c a r r i e doutwi t hmos toft hepr oduc es ol da tl oc a lf a r me r ’ sma r ke t s . Re s ul t s St r e a mba nkc ul t i va t i onr e s ul t si ns i l t a t i ona ndt hec hoki ngof r i ve r sa ndda ms . I ta l s ol e a dst oe ut r ophi c a t i ona sf e r t i l i z e r sc ont a i ni ngni t r a t e sa r e wa s he di nt ot her i ve r s . I ta l s ol e a dst ot hedi s t ur ba nc eofna t ur a le c os ys t e ms . Gol dPa nni ng Re s ul t s I tr e s ul t si nt hes i l t a t i o na ndc hoki ngofr i ve r sa ndda ms . I tl e a dst opol l ut i ona sda nge r ousc he mi c a l sl i keme r c ur ya n c ya ni dea r er e l e a s e di nt os t r e a ms . Thedi s t ur ba nc e sofe c os ys t e ms . Ur ba ni z a t i on Re s ul t s Re s ul t si ni nc r e a s e dpol l ut i ona nddi s t ur ba nc e sofe c os ys t e ms . I nc r e a s e di mpe r vi ouss ur f a c e sr e s ul ti ni nc r e a s e dove r l a ndf l ow, s hor t e rl a gt i mebe t we e nas t or ma ndas ur gei ndi s c ha r gea nd i nc r e a s e di nc i de nc e soff l oodi ngdowns t r e a m. Ri ve rdi ve r s i ons Some t i me sr i ve rwa t e ri sdi ve r t e dt hr oughma nma dec a na l s , da me sa ndpi pe l i ne st os uppl ywa t e rf ori r r i ga t i on,i ndus t r i a la nd dome s t i cus e . ThePungwePr oj e c ti nMut a r ei sa ne xa mpl e . Ther e s ul ti sde c r e a s e ddi s c ha r gea ndt hef or ma t i onofmor e de pos i t i onf e a t ur e s . Thi sma ya l s ol e a dt ot hes hor t a geofwa t e rdowns t r e a m. I nt e r l oc ki ngs pur s / s pur sa nds t e e pva l l e ys I nt e r l oc ki ngs pur sa r ear e s ul tofwa t e rt a ki ngt hee a s i e s tpa t h downt hes l opea ndt e n di ngotgor oundr e s i s t a ntr oc kr e s ul t i ngi na wi ndi ngc our s e . Thebe ndsbe c omemor epr onounc e dwi t ht i mebe c a us ewa t e r f l owsf a s t e ra tt hebe ndsa nde r ode st hes i de sl e a di ngt ot he pr oj e c t i ons / s pur st oi nt e r l oc k. Theunde r c utc onc a veba nkss t a ndupa sr i ve rc l i f f swhi l et he oppos i t ec onve xde ve l opi nt oas l i pof fs l opea st he r ei sve r yl i t t l e e r os i on. I nt e r l oc ki ngs pur soc c urma i nl yi nt heuppe rc our s es e c t i onof s t r e a msa ndr i ve r sa sr i ve r sha vel i t t l ee ne r gyt oe r ode . St e e ps i de dva l l e ys Si nc ewa t e rf l owsi ns ma l la mount sa ndi npr e domi na nt l ys t e e p a r e a si nt heuppe rc ou r s es e c t i onve r t i c a le r os i oni smor edomi na nt t ha nl a t e r a le r os i on. Thi sa l s of a c i l i t a t e dbyt hel oa dwh i c ht her i ve rc a r r i e sbe c a us ei t c a nnotr e a c ht h euppe rl e ve l soft heva l l e ywa l l sonc et he yha v e be e nf or me ds omuc hofc or r a s i onpr oc e s s e sa r el i mi t e dt ot he l owe rs e c t i onsoft her i ve ra ndt hi st e ndst ode e pe nt hec ha nne l . Ther e s ul ta r eVs ha pe ds t e e ps i de dva l l e ys . ZI MSECOLe ve lGe ogr a phyNot e s :Br a i di nga ndAl l uvi a lFa ns Br a i di ng Br a i di ngoc c ur st ypi c a l l ydur i ngt h edr ys e a s onwhe nar i ve r ’ s di s c ha r gei sgr e a t l yr e duc e d. Ther i ve rma ybes pl i ti nt os e ve r a lc ha nne l swhi c hr e j oi na nds pl i t a ga i n. The s ea r eknowna sbr a i de dr i ve rc ha nne l s . Ri ve r swi t hhe a vyl oa dsbe c ome sove r l oa de di nt hedr ys e a s on whe nt hea mountofwa t e rf a l l si nt hedr ys e a s ons . Ast hea mountofwa t e ra ndt husi t sc a pa c i t yt oc a r r yt hel oa di s r e duc e dde pos i t i ont a k e spl a c ei nt hef or mofs a ndba nksa nd a l l uvi umi s l a nd sc a us i ngac ha nne lt obr a i d. I nor de rt oc ont i nuef l owi ngt her i v e rs pl i t si nt os ma l l e rc ha nne l s t ha tc ont i nuous l ys pl i ta ndr e j oi n. Br a i di ngi st hepr oc e s sbywhi c har i ve rdi ve r ge sa ndc onve r g e s i nt oas e r i e sofs e gme nt ss e pa r a t e dbyc ha nne lba r s Abr a i de dr i ve rc a nbebot hwi dea nds ha l l ow. Al t houghi tmos t l yoc c ur si nt hef l oodpl a i nbr a i di ngi sbyno me a nsl i mi t e dt he r e . Huma na c t i vi t i e ss uc ha ss t r e a mba nkc ul t i va t i ona ndgol dpa nni ng c a nl e a dt ot hec hoki ngoft her i ve rduet oe xc e s s i ves i l t a t i ona nd t husr e s ul ti nb r a i di ng. De c r e a s e ddi s c ha r gei nWi nt e rmont hsl e a dst or i ve rbr a i di ngi n mos tofSout he r nAf r i c a ’ sr i ve r si n c l udi ngZi mba bwe . Al l uvi a lFa ns The s ea r ec oneorf a ns ha pe df e a t ur e sc ompos e dofa l l uvi umt ha t f or ma sat r i but a r yde s c e ndsdownt hebl uf f sont ot hef l oodpl a i n. De pos i t i onoc c ur sa tt hepoi ntwhe r et hes t e e pbl uf fme r ge swi t ha f l a tpl a i nl e a di ngt or e duc e dve l oc i t y. The ya l s ooc c urwhe nar i ve rde s c e ndsi nt oaf l a ta r e af r oma n e s c a r pme ntort hee dgeofar i f tva l l e y. ZI MSECOLe ve lGe ogr a phyNot e s :Oxbowl a ke s Anoxbowl a kei saUs ha pe dbodyofwa t e rt ha tf or mswhe na wi deme a nde rf r omt hema i ns t e mofar i ve ri sc utof f ,c r e a t i nga f r e e s t a ndi ngbodyofwa t e r . Thi sl a ndf or mi ss ona me df ori t sdi s t i nc t i vec ur ve ds ha pe , r e s e mbl i ngt hebowpi nofa noxbo w. De ve l opme ntofOxbowl a ke s Oxbowl a ke sf or mwhe na na c ut eme a nde rl e a ve sana r r owne c k s e pa r a t i ngt het woe ndsofame a nd e r . Ac t i vel a t e r a le r os i ont a ke spl a c eont heout s i debe ndsa ndbr e a k t hr ought hi sne c ke s pe c i a l l ydur i ngf l oods . I nf l oodt hec ute ndsa r es e a l e dof fbyde pos i t i ona ndt heme a ne r be c ome sa noxbowl a ke . Theba nksa r es t e a di l yr a i s e dbyde pos i t i onsr e s ul t i ngt i nt her i ve r l yi nga bovet hel e ve loft hel a ke . Thel a ke sgr a d ua l l yl os ewa t e ra sve ge t a t i ona nds e di me ntf i l lt he m up. ZI MSECOLe ve lGe ogr a phyNot e s :De l t a s Ade l t ai sage nt l ys l opi ngde pos i t i ona lf e a t ur et ha ti sf ounda ta r i ve r ’ smout hwhe r ei te mpt i e si nt oas e aoroc e a nt ha te xt e ndst o t hes ur f a c ea ndi ss ha p e dl i ket heGr e e kl e t t e rde l t a( Δ) . I ti si mpor t a ntt onot et ha ta l t houghs omede l t a sa r ei nde e ds ha pe d l i ket heGr e e kl e t t e rde l t as omede l t a sa spoi nt e dbe l owha veot he r s ha pe sa swe l lf ore xa mpl et heEs t ua r yde l t a . The ya r el owl yi ngs wa mpypl a i nst ha tgr a dua l l ybe c ome c ol oni s e dbyva r i oust ype sofpl a nt s . Thegr owt hofade l t ai nt e r f e r e swi t ht hef l owofar i ve rr e s ul t i ngi n t her i ve rs pl i t t i ngupi n t os e ve r a ld i s t r i but a r i e snotunl i ket heone s r e s ul t i ngf r ombr a i di ng. Adi s t r i but a r yi sac ha nne lt ha ts pl i t sa ndr e j oi nswi t hot he r c ha nne l soft hes a mer i ve r . Ane xa mpl ei st heNi ge rDe l t ai nWe s tAf r i c aa ndt heNi l eDe l t ai n Egypt . For ma t i onofde l t a s mos toft hel oa dc a r r i e dbyr i ve r si sde pos i t e di nt ot heoc e a ns ,s e a s a ndl a ke si nt owhi c ht her i ve r se mpt y. Some t i me st hel oa di sc a r r i e df a ra wa yi nt ot hemout hoft her i ve r be f or ei ts i nkst ot hebot t om. De l t a sa r ef or me dwhe nt hel oa di ns t e a ds i nksa tt hebot t omoft he mout hoft her i ve r . Whe nt hi sha ppe nsl a ye r sofs e di me ntc ol l e c ta ndpi l eupt of or ma ge nt l ys l opi ngpl a t f or m. Wi t ht i met hep l a t f or me xt e ndst ot hes ur f a c et of or made l t a . Condi t i onsne c e s s a r yf ort hef or ma t i onofade l t a . 1.Ther i ve rmus tha veal a r gel oa d. 2.Theve l oc i t yo ft her i ve rmus tbel owe nought oa l l owi t sl oa dt obe de pos i t e di nt her i ve r ’ smout h. 3.Ther i ve r ’ sl oa dmus tbede pos i t e df a s t e rt ha ni tc a nber e move dby t hea c t i onoft i de sa ndc ur r e nt s . 4.Thec ha nc e sf ort hef or ma t i onofade l t aa r egr e a t l ye nha nc e dwhe n c l a ypa r t i c l e sa r epa r tofar i ve r ’ sl o a dr e s ul t i ngi nt he m c oa gul a t i nga ndt hi c ke ni nga st he ymi xa ndr e a c twi t hs e a wa t e r a nds e t t l ea tt hebe di napr oc e s sc a l l e df l oc c ul a t i on. TheCongoRi v e rha sal a r geve l oc i t ya tt hepoi nta twhi c hi tme e t s t hes e aa ndt husha snode l t aa smo s tofi t sl oa di sc a r r i e dof fi nt o t hes e a . TheRi ve rNi ge rha sl owve l oc i t ya ti t smout hr e s ul t i ngi nt he f or ma t i onofa ne xt e ns i vede l t a . St a ge si nt hef or ma t i onofade l t a . St a ge1 De pos i t i oni nt her i ve r ’ smout hr e s ul t si nt her i ve rf or mi ngs e ve r a l di s t r i but a r i e s . Thede l t abe gi nst of or mwhe nt hei ni t i a ls e di me ntc ol l e c t sa tt he bot t omne a rt her i ve r ’ smout h. Asde pos i t i onsc ont i nue sl a ye rupo nl a ye ras l owpl a t f or mr e s ul t s . De pos i t i onont heba n ksoft hedi s t r i but a r i e sf or msl e ve e s . Thea r e abe t we e nt hedi s t r i but a r i e sma yr e s ul ti nt hef or ma t i onof l a goons . St a ge2 Thel a goonsbe gi nf i l l i ngwi t hs e di me ntwhi c hc a us e sf ur t he r di vi s i oni nt odi s t r i but a r i e sa ndt ot hef or ma t i onofs ma l l e r di s t r i but a r i e s . Thede l t as t a r t st ot a keamor es ol i da ppe a r a nc ea l t houghi tma y s t i l lbes wa mpya ndus ua l l yc ove r e dwi t hwa t e rl ovi ngve ge t a t i on. St a ge3 Fur t he ri nf i l l i ngoft hel a goonspl u st hegr owt hofve ge t a t i on r e s ul t si nt heol de rpa r t soft hede l t ac omi ngt os t a nda bovewa t e r l e ve lf or mi ngdr yl a nd. Cont i nue dde ve l opme ntofade l t ac a nl e a dt oi tme r gi ngwi t ht he f l oodpl a i na ndf or mi ngde l t a i cpl a i ns Type sofde l t a s The r ea r ef ourt ype sofde l t a svi z : Ar c ua t e ,Bi r d’ sf oot ,Es t ua r i nea ndCus p a t eDe l t a s . Ar c ua t e I sat r i a ngul a rs ha pe dde l t awi t ha na r c s ha pe ds hor e l i ne . TheNi ge rde l t ai sa ne xa mpl eofs uc hade l t a . The yha vec oa r s ea ndf i nes e di me nti nt hef or mofac one . I ti sc r os s e dbyma nydi s t r i but a r i e s . I ti sus e f ulf orma nt os e t t l eona si tpr ovi de sa r a bl ea ndf e r t i l e l a ndsa swe l la spa s t ur e sf ora ni ma l s . Howe ve rt hewa t e r l ogge dc ondi t i o nst e ndt of a vourpe s t sa nd di s e a s e s . Bi r dsf oot I sf or me dwhe r et he r ea r ewe a kt i da lc ur r e nt swhi c ha l l owt he di s t r i but a r i e st oe xt e ndf ur t he rs e a wa r dsr e s ul t i ngi naf or mt ha t l ooksmuc hl i ket hes ha peofabi r d’ sf oot . Ane xa mpl ei st heMi s s i s s i ppiRi ve rde l t a . I tc ons i s t sofve r yf i nema t e r i a ll i k es i l ta nds e ve r a ldi s t r i but a r i e s bor de r e dbyl e ve e sj ut t i ngoutf r omt hes hor e . Es t ua r i ne I sma deupofas i ngl ec ha nne lwi t hbr a i dsf or me df r omde pos i t s ma deont ot her i ve r ’ sc ha nne la si tr e a c he st heoc e a n. Ane xa mpl ei st heZa mbe z iRi ve rde l t ai nMoz a mbi que . Thede l t ai sf or me df r omma t e r i a lde pos i t e di nt hes ubme r ge d mout hofar i ve r . I tf or mst hes ha peofa nEs t ua r y. Cus pa t ede l t a Some t i me sac us pa t ede l t ama ybef or me d. The s ede ve l opwhe r et he r ei sl i mi t e ddi s t r i but a r yde ve l opme nti n c oa s t st ha tha vemode r a t ec ur r e nt . Ane xa mpl ei st heMe dj e r daRi ve rde l t ai nTuni s i a . ZI MSECOLe ve lGe ogr a phyNot e s :Dr a i na geBa s i n Thet e r mdr a i na geba s i nr e f e r st oa na r e aofl a nddr a i ne dbyar i ve r a ndi t st r i but a r i e s( r i ve rs ys t e m) . I ti nc l ude swa t e rf oundi nt hewa t e rt a bl ea nds ur f a c er unof f . Thedr a i na geba s i ni sa l s oknowna sc a t c hme nta r e aa monga n a s s or t me ntoft e r ms . The r ei sa ni ma gi na r yl i nes e pa r a t i ngdr a i na geba s i nsc a l l e da wa t e r s he d. Us ua l l y,t hewa t e r s he di sar i dgeo fhi ghl a ndf ore xa mpl e mount a i nsf or mi ngabounda r ybe t we e nt woa dj a c e ntdr a i na ge ba s i ns . Thepoi ntwhe r ear i ve rbe gi nsi sc a l l e dt hes our c e .I ti sus ua l l yi n t hef or mofal a keors pr i ng. Ac onf l ue nc ei st hepoi ntwhe r et wor i ve r sj oi n. At r i but a r yi sas t r e a mors ma l l e rr i ve rt ha tj oi nsal a r ge rr i ve r . Themout hi st hepoi ntwhe r ear i v e re nt e r st hes e a . ZI MSECOLe ve lGe ogr a phyNot e s :Thehydr ol ogi c a lc yc l e . Wa t e rdoe snotl e a veore nt e rt hep l a ne te a r t h. I ti si ns t e a dc ont i nuous l yt r a ns f e r r e dbe t we e nt hea t mos phe r ea nd t heoc e a ns . Thes ys t e mofi nput s ,s t or a ge s , f l owsa ndout put si sknowna st he wa t e rorhydr ol ogi c a lc yc l e . I nput s I nput s–r e f e r st owa t e rc omi ngi nt ot hes ys t e m. Pr e c i pi t a t i on–r e f e r st oa l lf or msofmoi s t ur et ha tr e a c ht heEa r t h’ s s ur f a c ee . g.r a i n,s now,s l e e ta ndha i l . St or a ge s I nt e r c e pt i on–t hi si swhe npr e c i pi t a t i onl a ndsonbui l di ngs , ve ge t a t i ona ndc onc r e t ebe f or ei tr e a c he st hes oi l . I nt e r c e pt i ons t or a gei sonl yt e mpor a r ya si ti sof t e nqui c kl y e va por a t e d. Ve ge t a t i ons t or a ge–t hi si swa t e rt a ke nupbyve ge t a t i on.I ti sa l l t hemoi s t ur ei nve ge t a t i ona ta nyonet i me . Sur f a c es t or a ge–t het ot a lvol umeofwa t e rhe l dont heEa r t h’ s s ur f a c ei nl a ke s ,pondsa ndpuddl e s . Gr oundwa t e rs t or a ge–t hes t or a geofwa t e runde r gr oundi n pe r me a bl er oc ks t r a t a . Cha nne ls t or a get hewa t e rhe l di nar i ve rors t r e a mc ha nne l . Fl ows Fl owsa ndPr oc e s s e s–wa t e rmovi ngf r omonepl a c et oa not he r . Ba s e f l ow–wa t e rt ha tr e a c he st hec ha nne ll a r ge l yt hr oughs l ow t hr oughf l owa ndf r ompe r me a bl er oc kbe l owt hewa t e rt a bl e . Cha nne lf l ow–t hemove me ntofwa t e rwi t hi nt her i ve rc ha nne l . Thi si sa l s oc a l l e dar i v e r ’ sdi s c ha r ge . Gr oundwa t e rf l ow–t hede e pe rmove me ntofwa t e rt hr ough unde r l yi ngpe r me a bl er oc ks t r a t ab e l owt hewa t e rt a bl e .Li me s t one i shi ghl ype r me a bl ewi t hl ot sofj oi nt sa ndc a nl e a dt of a s t e r gr oundwa t e rf l ow. I nf i l t r a t i on–t hedownwa r dmove me ntofwa t e ri nt ot hes oi l s ur f a c e . I nt e r f l ow–wa t e rf l owi ngdownhi l lt hr oughpe r me a bl er oc ka bove t hewa t e rt a bl e . Pe r c ol a t i on–t hegr a vi t yf l owofwa t e rwi t hi ns oi l . St e mf l ow–wa t e rr unni ngdownapl a nts t e mort r e et r unk. Sur f a c eRunof f–t hemove me ntofwa t e rove rt hes ur f a c eoft h e l a nd,us ua l l ywhe nt hegr oundi ss a t ur a t e dorf r oz e norwhe n pr e c i pi t a t i oni st ooi nt e ns ef r omi nf i l t r a t i ont ooc c ur . Thr oughf l ow–t hemove me ntofwa t e rdowns l opewi t hi nt hes oi l l a ye r .Thr oughf l owi sf a s tt hr oughpi pe s( c r a c ksi nthes oi lor a ni ma lbur r ows ) . Out put Out put s–wa t e rl e a vi ngt hes ys t e m. Eva por a t i on–t het r a ns f or ma t i ono fwa t e rdr opl e t si nt owa t e r va pourbyhe a t i ng. Eva pot r a ns pi r a t i on–t hel os sofwa t e rf r omadr a i na geba s i ni nt o t hea t mos phe r ef r omt hel e a ve sofpl a nt spl usl os sf r om e va por a t i on. Tr a ns pi r a t i on–e va por a t i onf r ompl a ntl e a ve s . Ri ve rdi s c ha r ge–t hea mountofwa t e rt ha tpa s s e sagi ve npoi nt ,i n agi ve na mountoft i me . ZI MSECOLe ve lGe ogr a phyNot e s :Sur f a c eWa t e rFl owa ndt heOr i gi n ofr i ve r s Sur f a c ewa t e rf l owa ndor i gi nofr i ve r s Ra i nf a l l i ngdownonl a ndf l owsdownt hes l opea ss he e tf l ow, r i l l f l owa ndgul l yf l owa l lofwhi c hc ont r i but et os t r e a mdi s c ha r ge . Unde r gr oundwa t e roo z e sa tc e r t a i npoi nt sc a l l e ds pr i ngsa nda l s o c ont r i but e ss t r e a mdi s c ha r ge . She e tf l ow I ti sat ypeofove r l a ndf l owordowns l opemove me ntofwa t e r whi c ht a ke st hef or mofat hi n,c ont i nuousf i l move rr e l a t i ve l y s moot hs oi lorr oc ks u r f a c e s i sge ne r a t e dwhe nr a i nf a l l i ngont ot hee a r t h’ ss ur f a c ef l owsov e r t hewhol es ur f a c ea sat hi nl a ye rofwa t e r . I tc ommonl yoc c ur sa tt hehe a doft hewa t e r s he dwhe r et hes l opei s ge nt l ea ndt hes ur f a c ef l a te . g.a r t i f i c i a ls ur f a c e s ,r oc kse t c . Ri l lf l ow Ri l l sa r es ha l l owc ha nne l s( nomor et ha naf e wt e nsofc e nt i me t r e s de e p)c uti nt os oi lbyt hee r os i vea c t i onoff l owi ngwa t e r . Ast hes l opes t e e pe ns , t hea mountofwa t e ri nc r e a s e sa nds he e tf l ow e nc ount e r ss ur f a c ei r r e gul a r i t i e ss h e e tf l owt ur nsi nt os ma l l s ha l l owc ha nne l sorr i vul e t sknowna sr i l l s . Gul l e yf l ow Ri l l si nt ur nj oi nupwi t hot he rr i l l sa ndf or mgul l i e s . Agul l yi sal a ndf or mc r e a t e dbyr unni ngwa t e r ,e r odi ngs ha r pl y i nt os oi l ,t ypi c a l l yonahi l l s i de . Gul l i e sr e s e mbl el a r gedi t c he sors ma l lva l l e ys ,buta r eme t r e st o t e nsofme t r e si nde pt ha ndwi dt h. Thepr oc e s sbywhi c hgul l i e sa r ef or me di sc a l l e dgul l yi ng. Agul l yma ygr owi nl e ngt hbyme a nsofhe a dwa r de r os i ona ta kni c kpoi nt . Gul l i e sa r es ome t i me sknowna sdonga s . Gul l i e se mpt yi nt os t r e a mswhi c ha r epe r e nni a lr i ve r s . Ther e s ul t sofwa t e re r os i on She e tf l owr e s ul t si ns he e te r os i on Thi sr e s ul t si nt hewa s hi nga wa yoff e r t i l et ops oi l sa nds ha l l ow s oi l s . Roc ks ur f a c e sa ndpl a ntr oot sa r ea l s oe xpos e dbys he e twa s h. Ri l lf l owr e s ul t si nr i l le r os i on. Gul l yf l owr e s ul t si ng ul l i e sa l s oknowna sdonga s . Bot hRi l la ndg ul l ye r os i onsr e s ul t si nt hef or ma t i onofdonga sa nd r a vi ne s . Thepr obl e msofdonga s . Ca nl e a dt os omea r e a sbe c omi ngi na c c e s s i bl ea st he ya r edi f f i c ul t t oc r os se s pe c i a l l ywhe ni tc ome st oc a r t sa ndmot orve hi c l e s . Di s r upt sc ommuni c a t i onl i ne ss uc ha sr oa ds . Re duc e st hea r e aa va i l a bl ef orc r opspa s t ur e sa nds e t t l e me nt s . Ca nl e a dt ot heupr oot i ngoft r e e s . Cont r i but et os i l t a t i on. Huma nsa nda ni ma l sc a nf a l li nt ot he s er a vi ne sl e a di ngt oi nj ur i e s . ZI MSECOLe ve lGe ogr a phyNot e s :Dr a i na gePa t t e r ns . Dr a i na gepa t t e r ni sat e r mt ha tr e f e r st ot hewa yi nwhi c har i ve r a ndi t st r i but a r i e sa r r a nget he ms e l ve si nt hedr a i na geba s i n. Thedr a i na gepa t t e r ne vol ve sove ral ongpe r i odoft i mea ndi s a f f e c t e dbys uc hf a c t or sa st heunde r l yi ngr oc k,t hes l opeoft he l a nd,t hee xi s t e nc eornone xi s t e nc eoff a ul t l i ne sa ndt e c t oni c move me nt s . Themos tc ommondr a i na gepa t t e r nsa r e :t r e l l i s ,de ndr i t i c ,r a di a l , c e nt r i pe t a la ndpa r a l l e l . Tr e l l i s Some t i me sknowna sr e c t a ngul a rd r a i na gepa t t e r n. I ti sf or me dwhe r es t r e a msj oi nt hema i nr i ve ra tr i ghta ngl e s . Thet r e l l i spa t t e r nde v e l opsi na r e a sofa l t e r na t eha r da nds of tr oc ks . Thema i nr i ve r( a l s oknowna st hec ons e que nts t r e a m)f ol l owst he di poft her oc ksdownt hes l opea f t e ra ni ni t i a lupl i f t . Thet r i but a r i e s( a l s ok nowna st hes ubs e que nts t r e a ms )whi c h de ve l opa l ongt hes of tr oc kj oi nt hema i ns t r e a ma tr i ghta ngl e s . The s et r i but a r i e sa r ea tt i me sj oi ne dbyt he i rownt r i but a r i e sa t mor eorl e s sr i g hta ngl e s . St r e a mst ha tf l owa ga i ns tt hedi poft her oc ks t r a t aa r ec a l l e d obs e que nts t r e a ms . I nZi mba bweTr e l l i sdr a i na gei sf o undi nt heChi ma ni ma nimo unt s . Tr e l l i sdr a i na gea l s ooc c ur sa l ongf a ul tl i ne sa ndr e c t a ngul a rj oi nt s . I ne r ode df ol dmounta r e a s . Duet ohe a dwa r de r os i onbys t r e a ms . De ndr i t i c Thewor dde ndr i t i cc ome sf r omt heGr e e kde ndr onme a ni ngt r e e . I nde ndr i t i cdr a i na gepa t t e r nst hes t r e a msj oi nonea not he ri na s ha pet ha tl ooksl i ket hebr a nc he sofat r e e . The s es t r e a mse ve nt ua l l ye ndupa sonebi gr i ve r( t het r unk) . Thet r i but a r i e sj oi ne a c hot he ra ta c ut ea ngl e s . I ti sc ommonl yf oundi na r e a swi t hauni f or mr oc ks t r uc t ur e r e s ul t i ngi nuni f or me r os i on. I ti sa l s of oundi na r e a swhi c hha vege nt l es l ope s . Ra di a l I sf or me dwhe r es t r e a msdr a i nf r omac e nt r a lhi ghl a ndi na l l di r e c t i ons . I ti sa l s oknowna sc e nt r i f uga la nddi ve r ge ntdr a i na ge . I ti sc ommoni na r e a swi t hc oni c a lhi l l sa nd/ ordome sf ore xa mpl e vol c a ni cc one sa ndot he rc oni c a ll a ndf or ms . St r e a msr a di a t i ngf r omt he s ea r e a sc a nl a t e re ndupf or mi ngot he r pa t t e r nsa st hef l owdowns t r e a ma ndme e tupwi t hot he rt r i but a r i e s . I nZi mba bwet he s et ypeofdr a i na gepa t t e r ni sf oundi na r e a st ha t ha vegr a ni t edome ss t i l lc ove r e dbys oi l . Ce nt r i pe t a lorc onve r ge ntdr a i na ge Conv e r ge ntDr a i na g e I sf oundi na r e a swhe r er i ve r sdr a i nt owa r dsac e nt r a li nl a ndl a ke , s wa mporde pr e s s i on. I ti si ne s s e nc ea ni nl a nddr a i na ges ys t e me . g.a si nt hec a s eoft he De a dSe a . I ti sc ommoni ni nl a ndde pr e s s i onss uc ha sf a ul t e di nt e r mont a ne ( be t we e nmount a i ns )ba s i ns ,c a l de r a sa swe l la si na r i da nds e mi a r i da r e a s . Pa r a l l e l . Ri ve r sa ndt r i b ut a r i e sf l owdownhi l lt oge t he ri namor eorl e s s pa r a l l e lpa t t e r n. I ti st hes i mpl e s ta ndmos tba s i cdr a i na gepa t t e r n. I toc c ur sonne wl yupl i f t e dl a ndorl a ndt ha ti sge nt l ys l opi ng a l l owi ngr i ve r sa ndt r i but a r i e st of l owi npa r a l l e lc ha nne l s . Exa mpl e si nc l udet heZa mbe z ia ndi t st r i but a r i e s . ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rRe gi me Ar i ve rr e gi mei st het e r mus e dt od e s c r i bet hea nnua lva r i a t i onsi n as pe c i f i e dr i ve r ’ sdi s c ha r ge . Ar i ve r ’ sdi s c ha r gei st hevol umeo fwa t e rf l owi ngt hr oughar i ve r c ha nne l . Thi si st het ot a lvol umeofwa t e rf l owi ngt hr oughac ha nne la ta ny gi ve npoi nta ndi sme a s ur e di nc ubi cme t r e spe rs e c ond. Some t i me st he s eme a s ur e / uni ti sknowna sc ume c s . Ar i ve r ’ sr e gi mei ss hownonagr a phc a l l e dahydr ogr a ph. Ahydr ogr a phs howst hedi s c ha r geofar i ve ra swe l la st ot a l r a i nf a l li nt her i ve r ’ sba s i n/ c a t c hme nta r e aove rape r i odoft i me , be f or e ,dur i nga nda f t e rt hes t or m. I ta l l owsf orar e l a t i ons hi pbe t we e nt her a i nf a l lf a l l i ngi nar i ve r ’ s c a t c hme nta r e aa ndt her i ve r ’ sdi s c ha r ge . Suc hi nf or ma t i onc a nbeus e dt o,f o re xa mpl e ,pr e di c tt her i s kof f l oodi ngi nagi ve na r e aa f t e ras t or me ve nt . Hydr ogr a ph Asa l r e a dys a i dar i ve r ’ sr e gi mei ss hownonas t or mhydr ogr a ph. Dur i ngas t or mmos to ft her a i nf a l l sont ot hel a ndr a t he rt ha n di r e c t l yi nt ot her i ve r . Thewa t e rt he nwi l lma kei t swa yi nt ot her i ve ra ndyouc a nus ea hydr ogr a pht os e ehowqui c kl yt hi soc c ur s . Byl ooki nga tt hepe a kr a i nf a l la ndc ompa r i ngi twi t ht hepe a k di s c ha r geyouc a nwor koutt hel a gt i me( t het i mebe t we e nt het wo pe a ks ) . Di f f e r e ntc a t c hme nta r e a swi l lha vedi f f e r e ntf l oodhydr ogr a ph s . Ar i ve r ’ sr e gi mei ss hownona na nnua lhydr ogr a phwi t ha l lt he mont hsl i s t e d. Cha r a c t e r i s t i c sofahydr ogr a ph Pe a kdi s c ha r ge s howst hema xi mu ma mountoff l owi nt her i ve r . Pe a kr a i nf a l l t hema xi muma moun tofr a i nf a l la ndwhe ni tf e l l . La gt i me t hedi f f e r e nc ebe t we e nt h epe a kr a i nf a l la ndt hepe a k di s c ha r gei . et het i mei tt a ke sf ort h er a i nt or e a c ht her i ve r . Ar i s i ngl i mpwhi c hs howsar i s ei ndi s c ha r ge . Af a l l i ngl i mpwhi c hs howsaf a l li ndi s c ha r ge . Fa c t or sa f f e c t i ngar i ve r ’ sr e gi me . Se a s ons -t he r ewi l lbear i s ei ndi s c ha r gedur i ngs umme r / r a i n mont hsa ndaf a l li ndi s c ha r gei nt h edr ymont hswhe nt he r ei sl i t t l e r a i nf a l l .The r ewi l lbeal a gt i mea swa t e rmove st hr ought he gr ounda ndf r oms t or a ge si nt ot hes t r e a m. Cl i ma t e r i ve r st ha tpa s st hr oughMe di t e r r a ne a nc l i ma t e st e ndt o ha vemor et ha nonepe a kpe r i oda st he yha vea not he rs ur gei n di s c ha r gedur i ngt hewi nt e rmont hswhe nt he s er e gi onsr e c e i ve t he i rr a i ns .Thes a mei sa l s ot r ueofr i ve r st ha tpa s st hr ougha r e a s t ha te xpe r i e nc es nowf ore xa mpl et heNi l e ’ sf a me df l oodsa r edue t os nowme l t i ngi nt heKi l i ma nj a r omount a i nsr e s ul t i ngi npe a k di s c ha r gee ve ni nt hehotdr ymont hsa swa t e rmove sf r oms no w s t or a gee . g.gl a c i e r si nt ot hes t r e a ms . Ge ol ogyf ore xa mpl er i ve r st ha tf l owt hr oughpor ousa ndpe r vi ous r oc kst e ndt oha ves ma l l e rpe a ks / s ma l lc ha nge si ndi s c ha r gea s oppos e dt or i ve r si ngr a ni t e( nonpor ousa ndi mpe r vi ous )r oc k s . Huma na c t i vi t i e sf ore xa mpl eur ba ni s a t i onr e s ul t si nmor e i mpe r vi ouss ur f a c e sa ndve r yhi ghpe a ks ,s hor tl a gt i mea ndhi ghe r pe a ks( di f f e r e nc e sbe t we e nt hel owe s ta ndhi ghe s tdi s c ha r ge . ) ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rRe j uvi na t i on Re j uve na t i onoc c ur swhe nt he r ei sane ga t i vec ha ngei nar i ve r ’ s ba s el e ve l( i . e .whe nt her i ve r ’ sba s el e ve lf a l l s )whi c hi nc r e a s e si t s pot e nt i a le ne r gya ndt huse na bl e si tt or e vi vei t se r os i vee ne r gyi n t hepr oc e s s e s . Ar i ve r ’ sba s el e ve li st hel owe s tp oi ntt owhi c har i ve rc a ne r ode . Ane ga t i vec ha ngei nar i ve r ’ sba s el e ve lma ybebr oughta bou tby ve r t i c a lupl i f t( f ore xa mpl ei s os t a t i cupl i f t )orbyaf a l li nt hel e ve l oft hes e af ore xa mpl eduet ot i de s . Thi sc ha nger e ne wsar i ve r ’ sa bi l i t yt oe r odeduet oa ni nc r e a s e d gr a di e nt . Ar e j uve na t e dr i ve re r ode sve r t i c a l l yi nt ot hef l oodpl a i nt opr o duc e ne wf e a t ur e st ha ta r edi f f e r e ntf r omt hos et ypi c a l l yf oundi nt h e f l oodpl a i n. La ndf or msr e s ul t i ngf r omr e j uve na t i on Re j uve na t i onpr oduc e ss e ve r a lf e a t ur e si nc l udi ng:i nc i s e d me a nde r s ,t e r r a c e sa ndwa t e r f a l l s / kni c kpoi nt s . Ri ve rt e r r a c e sa ndi nc i s e dme a nde r s Ri ve rt e r r a c e sa r er e mna nt soff or me rf l oodpl a i ns Whi c hf ol l owi ngve r t i c a le r os i onb r oughta boutbyr e j uve na t i on ha vebe e nl e f thi gha nddr ya bovet hec ur r e nta ndpr e s e nt da y f l oodpl a i n. I far i ve rqui c kl ye r od e sa ndc ut sq ui c kl yi nt ot hef l oodpl a i napa i r oft e r r a c e sofe qua lhe i ghtma ybes e e nf l a nki ngt hef l oodpl a i n c r e a t i ngava l l e yi nt oava l l e yf e a t u r eknowna spa i r e dt e r r a c e s . Some t i me st her i ve rdoe squi c kl yc uti nt ot hef l oodpl a i n,a l l owi ng i tt ome a nde r , r e s ul t i ngi nonet e r r a c ebe i ngr e move da st he me a nde rmi gr a t e sdowns t r e a m. Thi sr e s ul t si nt hef or ma t i onofunp a i r e dt e r r a c e s . I fupl i f tc ont i nue sf ors ome t i me ,i n c i s e dme a nde r sma yf or m. The s ea r eme a nde r st ha tha vebe e nc utde e pl yi nt ot heva l l e yf l oor . I nc i s e dme a nde r sa r ea l s oknowna se nt r e nc he dme a nde r s . Kni c kpoi nt ,r a pi dsa ndwa t e r f a l l s . Some t i me st hepoi ntwhe r et heupl i f toc c ur sc a nbevi s i bl e e s pe c i a l l ywhe nt heupl i f torf a l li nba s el e ve li sr a pi d. Thepoi ntwhe r et her i ve rc r os s e sf r omt heol dpl a i ni nt ot hene w pl a i ni sknowna skni c kpoi nt . Ar i ve rma yha vet ode s c e ntt hi skni c kpoi nta se i t he rar a pi dor wa t e r f a l l . ZI MSECOLe ve lGe ogr a phyNot e s :Ri ve rc a pt ur e Thi si sapr oc e s swhe r eoneRi ve rc a pt ur e st hehe a dwa t e r sona ne a r bys t r e a m. Thi sc a noc c urduet os e ve r a lr e a s onsvi z : Te c t oni ce a r t hmove me nt s ,whe r et hes l opeoft hel a ndc ha nge s , a ndt hes t r e a mi st i ppe doutofi t sf or me rc our s e . Na t ur a lda mmi ng,s uc ha sbyal a n ds l i deori c es he e t . Er os i on,e i t he r : He a dwa r de r os i onofones t r e a mva l l e yupwa r dsi nt oa not he r , La t e r a le r os i onofame a nde rt hr ought hehi ghe rgr ounddi vi di ng t hea dj a c e nts t r e a ms . I na na r e aofka r s tt opogr a phy,whe r es t r e a msma ys i nk,orf l ow unde r gr ound( as i nki ngorl os i ngs t r e a m)a ndt he nr e a ppe a ri na ne a r bys t r e a mva l l e y. Thepr oc e s s . Thedi a gr a ma boves howshowr i v e rc a pt ur ec a noc c ur . The r ea r et woc ons e que ntr i ve r s :St r e a mAa ndBa ndSt r e a mB ha sat r i but a r y( s ubs e que ntA) St r e a mBha shi ghe rdi s c ha r gea ndt hushi ghe re r os i ona la c t i vi t y t ha ns t r e a mA. St r e a mBmi ghta l s oha veal owe rba s el e ve la ndt husi nc r e a s i n gi t s a bi l i t yt oe r ode . Subs e que ntAmi gr a t e sups t r e a m( he a dwa r de r os i on)unt i li t r e a c he sSt r e a mA’ sc h a nne l . Thr oughapr oc e s sknowna swa t e r s he dmi gr a t i onSubs e que ntA e nl a r ge si t sowndr a i na geba s i na tt hee xpe ns eofSt r e a mA. I nt i mebe c a us eSubs e que ntAa ndSt r e a mBha veal owe rba s e l e ve lt hehe a dwa t e r sofSt r e a mAwi l lbec a pt ur e da nddi ve r t e d i nt oSubs e que n tA. Thepoi nta twhi c ht hehe a dwa t e r soft hemi norr i ve rc ha nge di r e c t i oni skno wna st hee l bowofc a pt ur e . Be l owt hi spoi ntawi n dga pma r kst hef or me rc our s eoft he nowbe he a de ds t r e a mormi s f i ts t r e a m. Ami s f i ts t r e a mi sar i ve rwhos ehe a dwa t e r swe r ec a pt ur e d r e s ul t i ngi nt hes t r e a mf l owi ngi nava l l e yt ha ti st ool a r get obe a c c ount e df orbyt hel owdi s c ha r ge . Akni c kpoi nta ndwa t e r f a l lmi ghtf or ma tt hee l bowofc a pt ur e e s pe c i a l l yi ft heba s el e ve loft hec a pt ur i ngr i ve ri sf a rl owe rt ha n t ha toft hebe he a de ds t r e a m. ZI MSECOLe ve lGe ogr a phyNot e s : Cha r a c t e r i s t i c sa ndLoc a t i onofHot de s e r NB: I ti si mpor t a ntt onot et ha tt heOr di na r yLe ve ls yl l a busc onf i ne sour s t udyt ohotde s e r t st ha ta r eot he r wi s ekn owna st r opi c a lde s e r t s .Ot he r de s e r t ss uc ha st hec ol dde s e r t sofSi be r i aa r ebe yondt hes c opeoft h e s yl l a busa ndt huswewi l ll i mi tournot e st ohotde s e r t s . Cha r a c t e r i s t i c sofhotde s e r t s Ade s e r ti sa na r e at ha tr e c e i ve sl i t t l epr e c i pi t a t i ona ndi s c ha r a c t e r i s e dbya r i di t yors e mi a r i di t y. Mos thotde s e r t sr a r e l ye ve rr e c e i vemor et ha n250mmofr a i nf a l l pe ra nnum. Suc hde s e r t sa r er e f e r r e dt oa sa r i dde s e r t sf ore xa mpl es omep a r t s oft heSa ha r aa r er e f e r r e dt oa sbe i nghype r a r i di . e .t he yr e c e i ve l e s st ha n50mmofr a i nf a l lpe ra nnum. Somehotde s e r t sa r er e f e r r e dt oa sbe i ngs e mi a r i dwhi c hme a ns t he yr e c e i vea tl e a s t50 0mmofr a i nf a l lpe ra nnum. TheKa l a ha r iDe s e r ti sa ne xa mpl eofas e mi a r i dhotde s e r t . Howe ve rt hi sr a i nf a l lma yf a l li nonebi gs t or mf ol l owe dby e xt e nde ddr ype r i ods . De s e r t sa r emos t l ydr yt hr oughoutt heye a re xc e ptdur i ngf r e a k s t or mst ha tf a l li ns omede s e r t se . g.t heNa mi dDe s e r t . I ti st hes hor t a g eofmoi s t ur eort hede f i c i ti nt hewa t e rba l a nc eof de s e r ta r e a st ha tgi ve st he mmos to ft he i rc ha r a c t e r i s t i c s . The yha ves a ndys oi l s . The yha vee xp e r i e nc ehe a vywi ndsf ore xa mpl eHa r ma t t a nsa nd dus ts t or ms . The yha ves c a ntve ge t a t i onc ove rmos tofwhi c hi sa da pt i vef or e xa mpl ec a c t i( pl ur a lo fc a c t us )ori sc onf i ne dt oorne a roa s e s . Thes hor t a geofwi ndme a nst he r ei sl i t t l ec ove rt opr ot e c tt hes oi l f r omt hee f f e c t sofwi nda ndt huswi nde r os i ont e ndst obe pr e va l e nt . The yha veve r yl a r gedi ur na lt e mpe r a t ur er a nge si . e .t he ya r eve r y hotdur i ngt heda ywi t hs omepa r t soft heSa ha r aj us ta ppr oa c hi ng 50° Ca ndve r yc ol da tni ghtwi t ht e mpe r a t ur e sof t e nf a l l i ngbe l ow f r e e z i ngpoi nt . Some t i me st het e mpe r a t ur er a ngei sa shi gha s20° Cormor e . Duet ol a c kofs ha dea ndmi ni ma lc l oudc ove rde s e r t sha vehi g h e va pot r a ns pi r a t i onr a t e s . Asha sbe e na l r e a dys a i da bove :pr e c i pi t a t i oni nt hef or mofr a i ni s i nf r e que nta ndunr e l i a bl ei nde s e r t s . The s es por a di cr a i nst e ndt oc omer e s ul ti nf l a s hf l oodsa ndc a nbe a s s oc i a t e dwi t hs hor tpe r i odsofve ge t a t i vegr owt h. Thef l a s hf l oodsma ya l s oc r e a t es t e e pwa l l e ds c a r psa ndgul l e ys . La ndf or mst e ndt oha vea ngul a rf e a t ur e sbe c a us et hel a c kofr a i n r e s ul t si nmi ni ma lc he mi c a lwe a t he r i ng. Exa mpl e soft r opi c a lde s e r t sa r et h eSa ha r ade s e r twhi c hc ove r s a boutaqua r t e rofAf r i c a ’ ss ur f a c e , t heNa mi bDe s e r ti nNa mi bi a , t heKa l a ha r iDe s e r t ,t heGobide s e r ti nChi naa ndt heMoj a ve De s e r ti nNe va da ,USA. Type sofDe s e r t s De s pi t et hebe l i e fofma nype opl ede s e r t sa r enotc ompos e dof homoge ne ouss a nddunec ove r e db oundl e s spl a i ns . The ydoha vedi ve r s el a nds c a pe s . De s e r t s / l a nds c a pe sa r ede s c r i be da c c or di ngt ot hec ha r a c t e r i s t i c sof t he i rl a nds c a pe . The r ea r et hr e ec ommont ype sofh otde s e r t s : 1.St onyorr e gde s e r t s . 2.Roc kyorHa ma dade s e r t s 3.Sa ndyore r gde s e r t s . 1Re gde s e r t s Thel a nds c a peofr e gde s e r t sc ons i s t sofmos t l ype bbl e s ,s t one sa nd gr a vewhi c hc a nnotbebl owna wa ybyt hewi nd. The s el a nds c a p e sa r ea l s oknowna sde s e r tpa ve me nt s . Thes ur f a c e so fs uc hde s e r tl a nds c a pe sa r ec ove r e dwi t hc l os e l y pa c ke d,i nt e r l oc ki nga ngul a rorr ounde dr oc kf r a gme nt sofpe bbl e a ndc obbl es i z e . SomeWe s t e r npa r t soft heSa ha r aDe s e r tha ves uc hl a nds c a pe s . Thet e r msRe g( i nt hewe s t e r nSa ha r a ) ,orSe r i r( i nt hee a s t e r n Sa ha r a )orGi bbe rPl a i n( Aus t r a l i a ) ,orSa ï( Ta r i mDe s e r t ,c e nt r a l As i a ) ,a ppl yt oas a ndypl a i norbr oa dde pr e s s i onl a r ge l yc ove r e d byl a ggr a ve l sora ngul a rboul de r s ,f r omwhi c ht hef i ne rs oi la nd s e di me ntha sb e e ns t r i ppe dbye ol i a na bl a t i on. 2Ha ma daDe s e r t Thi si sat ypeofde s e r tl a nds c a pec ons i s t i ngofhi gh,l a r ge l yba r r e n, ha r d,r oc kypl a t e a us ,wi t hve r yl i t t l es a ndbe c a us et hi sha sbe e n r e move dbyde f l a t i on. Thedi f f e r e nc ebe t we e nHa ma daa ndRe gi st ha tRe goc c ur sa s s t onypl a i nsorde pr e s s i onsc ove r e dwi t hgr a ve l sorboul de r s ,r a t he r t ha na shi ghl a ndpl a t e a us (Ha ma da ) . Ha ma daorha mma dat he r e f or ei sade s e r thi ghpl a i norpl a t e a u whe r ede f l a t i onha sr e move dt hef i negr a i ne ds ur f a c ema t e r i a l sa nd l e f tbe hi ndas ur f a c eofs a nds c our e dbe dr oc kwi t horwi t houta ve ne e rofpe bbl e sorboul de r s . Thewor dha ma dai sAr a bi cf or“ r oc kpl a i n. ” 3Er gorSa ndyde s e r t s Ane r gi sabr oa d,f l a ta r e aofde s e r tc ove r e dwi t hwi nds we pts a nd wi t hl i t t l eornove ge t a t i vec ove r . Thewor de r gi sAr a bi cf or“ dunef i e l ds ”me a ni ngal a nds c a pe c ove r e dbys a nddune s . The ya r ear e s u l tofwi ndde pos i t e ds a ndpi l i ngupi nt os a nddune s . Thel a nds c a pei sha r dl yf i xe dnori si ts t a t i ona r ya st hes a nddune s a ndr i dge sa r ec ons t a nt l ymovi nga sar e s ul tofwi nda c t i on. TheSa ha r aDe s e r ti st hel a r ge s tEr gde s e r ti nt hewor l d. Er gde s e r t sa r es ome t i me sknowna sSa nds e a s . Thi sowi ngt ot he i rundul a t i ngpl a i nsofs a ndt hes ur f a c eofwh i c h i sbl owni nt or i ppl e sa nds a nddune s . N. B.Asha sa l r e a dybe e ns a i dmos tde s e r t sha vea l loft hel a nds c a pe s a bovewi t hi nt he i rb ounda r i e s .Fore xa mpl ewhi l et heSa ha r ade s e r ti s f ort hemos tpa r ta nEr gde s e r ts omepa r t sofi tha vebot hHa ma daa nd Re gl a nds c a pe s . ZI MSECOLe ve lGe ogr a phyNot e s :Loc a t i onofHotDe s e r t s . Thel a r ge s ta r i da nds e mi a r i dde s e r t soc c urbe t we e nl a t i t ude s15° a nd30°Nor t ha ndSout hoft hee qua t or . Mos toft he s ed e s e r t sa r el oc a t e do nt hewe s t e r ns i de soft he c ont i ne nt a lma s s e sonwhi c ht he yl i e . The yoc c urwi t hi nt heTr a dewi ndbe l twhe r et hewi ndsa r eof f - s hor e . Of f s hor ewi ndsa r et hos ewi ndst h a tbl owf r omt hes hor et owa r ds t heoc e a n. The s ewi nds( Tr a dewi nds )t e ndt obedr ya f t e rl oos i ngt he i r moi s t ur ea st he yj our ne ya c r os st hee a s t e r ns i deofc ont e nt s . Al t houghwe s tc oa s t sha veons hor ewi nds( wi ndsf r omt heoc e a n t owa r dst hel a nd)bl owi ngt owa r dst he m,t he yr a r e l ybr i ngr a i n . Thi si sbe c a us et heons hor ewi ndsme e twi t hc ol dc ur r e nt st ha t bl owpa r a l l e lt oc oa s tl i ne s( e . g.t h eCol dBe ngue l ac ur r e nti nt he c a s eoft heKa l a ha r ia n dt heCol dAngol ac ur r e nti nt hec a s eoft he Na mi bde s e r t )t hi sc a us e st hemoi s t ur ewi t hi nt heons hor ewi n ds t oc onde ns ea ndf or mmi s t ,f oga ndl i ghtr a i nbe f or et hewi nds r e a c ht hec oa s t . Mos toft hewi ndst ha tbl owa c r os sde s e r t sa r el a ndwi ndswhi c h a r edr y/ c ont a i nl i t t l emoi s t ur ea ndt he r e f or edonotr e s ul ti na n y f or mofpr e c i pi t a t i on. Somede s e r t sa st heAr i z onade s e r ta r ef a rf r omoc e a ns ,moi s t u r e f r omoc e a nsi se xha us t e di nt hef or mofr a i nf a l li not he ra r e a s be f or ei tr e a c he st he s ede s e r t ss i nc et he ya r ef ur t he ri nt hei nt e r i or . Somede s e r t ss uc ha st heGobiDe s e r t ,a r el oc a t e di nr a i ns ha dow a r e a sbe c a us et he ya r ei nde pr e s s i o nsorba s i ns . Si nc et he ya r eont hel e e wa r ds i deofmount a i nswhe r ewa r mdr y a i ri ss i nki ngt he yt e ndt or e c e i vel i t t l et onor a i nf a l l . I na ddi t i ont ot hi st her e l a t i vehumi di t yoft hea i rma s sf a l l s r e s ul t i ngi nhi ghe va po t r a ns pi r a t i onr a t e st huse xa c e r ba t i ngt he a r i di t yofde s e r t swhi l ei nc r e a s i ngt he i rt e mpe r a t ur e . TheKa l a ha r ia ndSa ha r ade s e r t sa r ea l s ol oc a t e dont her a i n s ha dows i deofma j ormount a i ns . I nZi mba bwea r e a sl i keSa veva l l e ya ndma j orpa r t sof Ma t a be l e l a nda r ehota ndr e c e i vev e r yl i t t l er a i nf a l l ,dr ought sa r e f r e que nta ndma ye ve nt ua l l ybe c omede s e r t s . Somede s e r t sa r el oc a t e di nt hes ub t r opi c a lhi ghpr e s s ur ez one30° Nor t ha ndSout hoft hee qua t orwhi c hme a nswi ndst e ndt obl ow f r omt he s ea r e a sa nddr ywa r ma i ri ss i nki ngc r e a t i ngpe r ma ne nt Hi ghpr e s s ur ebe l t s . I ns omea r e a sa st hePa t a goni a nDe s e r tc oolof f s hor ec ur r e nt s pr e ve ntl oc a lons hor ewi ndsf r ombr i ngi ngi nr a i n. Mos tHotDe s e r t sa r ei nc r e a s i ngi na r e ai napr oc e s sc a l l e d de s e r t i f i c a t i on. Huma na c t i ons ome t i me sc ont r i but et ode s e r t i f i c a t i ons oi ns o me wa ysde s e r t sa r eama nma def e a t ur e . Cl i ma t ec ha ngeha sa l s or e s ul t e di nc ha nge si nl oc a lr a i nf a l l pa t t e r nswi t hi n c r e a s e di nc i de nc eofdr ought si npl a c e sl i ke Soma l i awhe r er a i nf a l lmi ghtnotf a l lf orye a r sone nd. Thi st opi cwi l lbel ooke da ts e pa r a t e l yl a t e r . ZI MSECOLe ve lGe ogr a phyNot e s :Wi ndAc t i oni nDe s e r t s Wi ndi sapr oc e s swhe r et hewi ndde t a c he ss oi lpa r t i c l e sf r omt he l a nds ur f a c ea ndt r a ns por t st he mbyi t sf or c e . I toc c ur swhe nf or c e se xe r t e dbywi ndove r c omet hegr a vi t a t i o na l a ndc ohe s i vef or c e sofs oi lpa r t i c l e sont hes ur f a c eoft hegr ound. I mpor t a ntnot i c e Ac ommonmi s c onc e pt i oni st ha twi nde r os i oni st hemos t domi na ntf or mofe r os i oni nde s e r t s . Tha ti snott r uea swa t e ra c t i ona ndot he rf or msofde nuda t i ona r e j us ta si mpor t a nt . Al t houghwi nda c t i oni snott hemos ti mpor t a nta ge ntofc ha ngei n de s e r t s ,i t se f f e c ta r ef a rmor ei mpor t a nthe r et ha ni not he ra r e a s . Yous houl da l s onot et ha tc he mi c a lwe a t he r i nga l s ooc c ur si n de s e r t s . Thei mpor t a nc eofwi nda c t i ont he r e f or eva r i e sf r omde s e r t l a nds c a pet ode s e r tl a nds c a pea ndc a nnott husbege ne r a l i s e d. Wi ndAc t i on Wi nda c t i oni nde s e r t sa r ea l s okno wna sa e ol i a npr oc e s s e s . The s epr oc e s s e si nc l udee r os i on,t r a ns por t a t i ona ndde pos i t i on. Er os i on Wi nde r os i oni nvol ve st hr e ema i npr oc e s s e s :de f l a t i on,a br a s i on a nda t t r i t i on. 1.De f l a t i on Thi si st hepr ogr e s s i ver e mova loff i nema t e r i a lbywi ndl e a vi ng r e gl a nds c a pe sbe hi nd. Bybl owi nga wa ys a nda ndot he rr o c kwa s t e ,t hewi ndl owe r st he de s e r ts ur f a c epr oduc i ngde pr e s s i o nsknowna sc l os e dde pr e s s i ons orde f l a t i onhol l ows . Be c a us et hef i ne rma t e r i a li sc ompos e dofs ma l l e rpa r t i c l e s ,i ti s l i f t e dof fa ndc a r r i e da wa ybyt hef or c eoft hewi nd. Thede f l a t i onpr oc e s spr ovi de st hes uppl yofs a ndus e dt obui l dup s a nddune si no t he rpa r t soft hede s e r t . 2.Abr a s i on i st hes a ndbl a s t i nga c t i onpr oduc e dbyma t e r i a l sdur i ngs a l t a t i ona s t he ya r et r a ns p or t e dbywi nd. Thi spr oc e s ss moot hs , pi t s ,pol i s he sa ndwe a r sa wa yr oc kst ha ta r e c l os et ot hegr ound. Si nc es a ndpa r t i c l e sc a nnotbel i f t e dupve r yhi ghof ft hegr ound t hez oneofma xi mume r os i ont e ndst obewi t hi na bout1me t e r f r omt hede s e r ts ur f a c e . Thi ss ome t i me sr e s ul t si nunde r c ut t i ngofe f f e c t sonr oc ks . La r ger oc ksa r epol i s he dont he i rwi ndwa r ds i de sa ndr oc kst h a t a r enotuni f or ml i kegr a ni t ea r et ur ne di nt os pongy,pi t t e d,r ough s ur f a c e sduet os omemi ne r a l sbe i ngs of t e rt ha not he r s . Pe bbl e sa nds ma l lr oc ksa r es ha pe di nt ove nt i f a c t swi t hpol i s he d wi ndwa r ds i de s .s e edi a gr a ma bove . 3At t r i t i on I st hepr oc e s sbywhi c hl a r ger oc kpa r t i c l e sr ol la ndr uba ga i ns t e a c hot he ra ndwe a ra wa y. Thi sha ppe nsdur i ngt h ewi ndt r a ns por t a t i onpr oc e s s e s . Thi spr oc e s spr oduc e ss a ndpa r t i c l e st ha ta r er ounde di nt opa r t i c l e s a boutt hes i z eofmi l l e ts e e ds . ZI MSECOLe ve lGe ogr a phyNot e s :Wi ndAc t i oni nDe s e r t s :Wi nd Tr a ns por t Wi ndi sa bl et ot r a ns por t( move )s a nda nddus tpa r t i c l e sde pe ndi ng oni t ss pe e da ndf l ow. Thee f f e c t i ve ne s sofwi nde r os i ona ndt r a ns por tde pe ndona numbe roff a c t or s : Ae ol i a nmove me nti sgr e a t e s twhe r et hewi ndsa r es t r ong( 20km/ hr ormor e ) ,t ur bul e nt ,c omef r omac ons t a ntdi r e c t i ona ndbl ows s t e a di l yf oral e ngt hoft i me . Thee f f e c t i ve ne s sa ndna t ur eofwi ndt r a ns por ta l s ode pe ndsont he na t ur eoft her e gol i t h(we a t he r e dma t e r i a l ) . I ti sa l s omor ee f f e c t i vei na r e a swh e r et he r ei sl e s sve ge t a t i on c ove rwhi c ht e ndt oa c ta swi ndbr e a ksbya bs or bi ngs omeoft he wi nd’ se ne r gy. I ta l s ode pe ndsont hema t e r i a lbe i ngt r a ns por t e df ore xa mpl ei ft he ma t e r i a li sdr ya ndunc ons ol i da t e di tc a nbe t t e rbet r a ns por t e d. Opt i mumwi nde r os i ona ndt r a ns por t a t i onoc c ur si ns e mi a r i dpa r t s ofde s e r t s . Wi ndt r a ns por t Wi ndmove sma t e r i a lbyt hr e epr oc e s s e s : Sus pe ns i on,s a l t a t i ona nds ur f a c ec r e e p. I ti si mpor t a ntt onot et ha te a c hoft he s eme t hodsoft r a ns por t a t i on donotha ppe ni ni s ol a t i onbut ,of t e na l lt hr e et a kepl a c e s i mul t a ne ousa ta nygi ve nt i me . Sus pe ns i on Ha ppe nswhe nma t e r i a l sa r eve r yf i nei . e .l e s st ha n0. 15mmi n di a me t e r . Thi sme a nst ha tt he yc a nbee a s i l ypi c ke dupbyt hewi nd, The ya r et he nr a i s e dt oc ons i de r a bl ehe i ghta ndc a r r i e d,i nt hea i r , f orgr e a tdi s t a nc e s . Sa ndpa r t i c l e sha vebe e nonoc c a s i onc a r r i e df r omt heSa ha r a de s e r ta ndde pos i t e di nBr i t a i nagr e a tdi s t a nc ea wa y. Sus pe ns i onc r e a t e sdus ts t or mst ha tof t e nr e duc evi s i bi l i t yi n de s e r t st ol e s st ha nak i l ome t e r . Sa l t a t i on Whe nwi nds pe e dse xc e e dt het hr e s hhol dve l oc i t y( t ha ti st hes pe e d r e qui r e dt omovegr a i npa r t i c l e s ) , f i nea ndc oa r s e gr a i ne ds a ndpa r t i c l e sa r el i f t e da ndr i s ea l mos t ve r t i c a l l yf ors e ve r a lc e nt i me t e r sbe f or ef a l l i nga ga i nt ot hegr ound. Whe nt he yr e t ur nt ot h egr oundt he yf ol l owaf l a tt r a j e c t or yt h a t s e e st he mf a l las hor tdi s t a nc ef r omwhe r et he ywe r epi c ke dupbut noti nt hes a mepl a c e . Thepa r t i c l e sa r emove dbyt hewi n di nal e a pf r oggi nga nd bounc i ngma nn e r . Eve ni nt hemos ts e ve r es t or mst hepa r t i c l e sa r er a r e l yl i f t e dt o mor et ha n2me t e r si nhe i ghtt husdi f f e r e nt i a t i ngt hi sme t hodof wi ndt r a ns por t a t i onf r o ms us pe ns i o n. Sur f a c ec r e e p Aspa r t i c l e sa r et r a ns por t e dbys a l t a t i ona nds us pe ns i ont he yma y di s l odgea ndpus hf or wa r dl a r ge rpa r t i c l e s( i . e .t hos et ha ta r emor e t ha n0. 25mmi ndi a me t e r ) . The s ea r et ooh e a vyt obel i f t e df r omt hegr oundbyt hewi nd’ s e ne r gy. Howe ve rduet oc ont i nue dbomba r dme ntbyt hes ma l l e rpa r t i c l e s be i ngt r a ns por tbyt heot he rmode soft r a ns por tt he yr ol la nd gr a dua l l ymoveove rt hes ur f a c eoft hede s e r t . De pos i t i on Duet ot heoc c ur r e nc eofobs t a c l e sa ndi mpe di me nt ss uc hsa s ve ge t a t i on,r oc ks ,de a da ni ma lc a r c a s e sa nds e t t l e me nt s Ma t e r i a l st r a ns por t e dbywi nda r ee ve nt ua l l yde pos i t e d. De pos i t i onc a na l s ooc c urduet oar e duc t i oni nwi nde ne r gy. Wi ndde pos i t i onf or msl a ndf or mss uc ha sba r c ha na nds e i fdun e s . ZI MSECOLe ve lGe ogr a phyNot e s :De f l a t i onHol l ows Ar ea l s oknowna sc l os e dhol l owsorbl owout s . The s ea r ee nc l os e dde pr e s s i onsc a u s e dbywi nde r os i on. I nde s e r t st hewi nde r ode sl oos ema t e r i a lf r omf l a ta r e a swhi c h ha ve ,unc e me nt e ds e di me nt ss uc ha st hos eoc c ur r i ngi nt r opi c a l de s e r t s . De f l a t i onhol l owsde ve l opi na r e a swhe r et het r a ns por t e dma t e r i a l s i sde pos i t e d. Asa l r e a dyme nt i one dde pos i t i onoc c ur swhe nt hewi ndme e t swi t h a ni mpe di me nt . De f l a t i onhol l owsa r eus ua l l yf or me dons ur f a c e spa t c he swhe r e t hepr ot e c t i veve ge t a t i vec ove rha sbe e nl os tf ore xa mpl eduet o huma na c t i vi t i e sorpe r i odsofe xt e nde ddr ought s . Si nc et ha tpor t i onbe c o me sunpr ot e c t e dt het hewi ndde f l a t e sa nd s c our sc ont i nuous l ya tr e l a t i ve l yun c ons ol i da t e dma t e r i a l , Thema t e r i a li sde pos i t e dont hee dge soft hehol l owt ha ta r es t i l l pr ot e c t e dbyve ge t a t i ons uc ha sma r r a mgr a s s . Ther e mova loft hef i nepa r t i c l e st hel owe r i ngoft hel a ndf or m l e a dst ot hef or ma t i onofade pr e s s i on. Ane xa mpl ei st heQa t t a r aDe pr e s s i on Some t i me swa t e rt ha tf a l l si nt he s ede pr e s s i onhol l owsdur i ng f r e a ks t or msc ol l e c t st of or mpool si nt hemi ds tofde s e r t s pr ovi di nga ne s s e nt i a ls our c eofwa t e rf orl oc a le c os ys t e ms , a ni ma l sa ndhuma nsa ndt he i ra c t i vi t i e s . I fa na r e ai se r ode ddo wnt ot hewa t e rt a bl e ,f ur t he rde f l a t i oni s pr e ve nt e dunl e s st hewa t e rt a bl ei sa l s ol owe r e dbye va por a t i on. Someoa s e si nt heSa h a r awe r ef or me di nt hi sma nne ra ndma ybe be l ows e al e ve l . Dune sa r ema def r oms a ndt ha ti sde pos i t e da tt hel e e wa r ds i deof t hewi nd. Somede f l a t i onhol l owsma ybef or me di npa r tduet ot hepr e s e nc e off a ul t swi t hi nt her oc kswhi c ha r ee xpl oi t e da ndwi de ne dby we a t he r i nga ndt her e gol i t hr e move dbywi nde r os i on. Not enot ea l loa s i sa r ef or me dbyde f l a t i ons omea r ena t ur a l l y oc c ur r i ngs pr i ngsa nds omer e s ul ta sar e s ul toff r e a ks t or msa nd t heunde r l yi ngge ol ogi c a lr oc ksl i mi t i ngt hea mountofi nf i l t r a t i on. ZI MSECOLe ve lGe ogr a phyNot e s :Sa ndDune s Ass oona swi ndve l oc i t ydr opswi ndde pos i t i onoc c ur s . Thehe a vi e s tma t e r i a li sde pos i t e df i r s twhi l et hef i ne rma t e r i a la nd dus ti sc a r r i e df ur t he rbe f or ebe i ngdr oppe d. Asar e s ul tl oe s s( whi c hc ons i s t soff i nepa r t i c l e s )i ss ome t i me s de pos i t e dt hous a ndso fki l ome t e r sf r omde s e r t s . La r gemoundsofs a ndr e s ul tf r oms a ndde pos i t i onswi t hi nt he de s e r t . The s er e s ul ti nt hef or ma t i onofe r gl a nds c a pe ss uc ha st hos ef ound i nt heSa ha r a . Thr e ema j ort ype soff e a t ur e sr e s ul tf r omwi ndde pos i t i ona ndf or m pa r toft hee r gl a nds c a pe : s a ndr i ppl e s ,ba r c ha ndune sa nds e i fdune s . Sa ndr i ppl e s The s ea r es ma l lwa ve l i kef e a t ur e swhi c hde ve l opons a ndwhi c h movee a s i l y. The yr a ngef r omaf e wc e nt i me t e r st oa boutame t e ri nhe i ght The ya r eof t e nt e mpor a r ya nds uf f e rde s t r uc t i onwhe nt hewi nd c ha nge sdi r e c t i on. Sa ndDune s The s ea r ehi l l sofs a ndwhi c ha r ef oundi nava r i e t yofs ha pe , s i z e a nddi r e c t i on. Dune sde ve l opwhe ns a ndgr a i nsmove dbys a l t a t i ona nds ur f a c e c r e e pa r ede pos i t e d( r e me mbe rs us pe ns i onma t e r i a lf or msl oe s s whi c hi sde pos i t e dout s i dede s e r t s ) . Somedune s ,butnota l l ,f or ma r oundobs t a c l e ss uc ha st r e e s , bus he s ,r oc ks ,as ma l lhi l lore ve nade a da ni ma l . Mos tdune sf or mona r e a st ha ta r ef l a ta nds a ndyr a t he rt ha nt h os e a r e a st ha ta r er oc kya ndune ve n. Dune sva r yi ns i z ef r omaf e wme t e r st oove ra100me t e r si n he i ght . Al t hought he yt a kema nys ha pe s ,t he r ea r et woc ommont ype sof dune s : Ba r c ha na ndSe i fdune s . Ba r c ha nDune s Aba r c ha ndunei sas ma l lc r e s c e nts ha pe ddune . I tha sahe i ghtc a nr a ngef r omaf e wme t e r st oa bout30me t e r si n he i ghta ndi tc a nbe400me t e r swi d e . . The yl i ea tr i ghta ngl e st ot hepr e va i l i ngwi nd. I tha si t s“ hor ns ”poi nt i ngdownwi nd. The yus ua l l yf or ma r ounda nobs t a c l es uc ha sar oc k,pi e c eof ve ge t a t i onore ve nade a da ni ma l . Ast hemound,whi c hi swi ndwa r dgr owsduet oc ont i nue ds a n d de pos i t i ons , I t sl e a di nge dge sa r es l owl yc a r r i e df or wa r di nadownwi nd di r e c t i on. Thewi ndwa r ds l opeoft hedunei sge nt l e . Thedownwi nds i dei ss t e e pa nds l i ght l yc ur ve d. Thi si sc a us e dbye ddi e st ha ta r es e tupbyt hepr e va i l i ngwi nd. Aba r c ha ndunemove sa sgr a i nsofs a nda r emove dupt he wi ndwa r ds l opet of a l lont ot hel e e wa r ds i de . The yc a noc c urbot hs i ngl yori ngr oups . Si e fDune s Ar ea l s oknowna st r a ns ve r s edune s ,l i ne a rdune sordr a a . The ya r er i dge s ha pe dwi t hs t e e ps i de sa ndl i epa r a l l e lt ot he pr e va i l i ngwi nd. The ya r ea l s of or me da nda ppe a rpa r a l l e lt oe a c hot he r . As e i fduneha sas ha r pc r e s twhi c hma ybea100me t e r si nhe i ght a ndt he yc a ns t r e t c hf orupt o150ki l ome t e r si nl e ngt h. The ya r es e pa r a t e dbyf l a tc or r i dor swhi c ha r ebe t we e n25a nd400 me t e r swi de . The s ec or r i dor sa r es we ptc l e a rofs a ndbyt hepr e va i l i ngwi nd . Eddi e sbl owupa ga i ns tt hes i de sofdune sa nddr opde pos i ts a n d t ha ti sa dde dt ot hedune s . The yus ua l l yd e ve l opf r oms ma l ls a ndr i dge s . The ys l owl ymovef or wa r di nt hedi r e c t i onoft hepr e va i l i ngwi nd a st he ymovef or wa r d. The yf e a t ur ei npa r t soft heNa mi bDe s e r ta ndt heSa ha r aDe s e r t s a swe l la sot he rde s e r t s . Ya r da ngs ,Ze uge nsa ndRoc kPe de s t a l s ZI MSECOLe ve lGe ogr a phyNot e s :HotDe s e r t s :Ya r da ngs Ze uge ns Pi c t ur e di nt hedi a gr a ma bove . Ze uge nsa r et her i dge si n“ r i dgea n df ur r ow”l a nds c a pe sf oundi n de s e r t s . The s er i dgea n df ur r owl a nds c a pe ss c ul pt e df oundi nhotde s e r t s a r ear e s ul tofwi nde r os i on. Wi nda br a s i ont ur nsade s e r ts ur f a c ewhi c hha sal a ye rofr e s i s t a nt r oc kunde r l a i nbyal a ye rofwe a kr oc ki nt or i dge sa ndf ur r ows . Thewi ndus ua l l yt a ke sa dva nt a geofj oi nt sa ndc r a c ksc r e a t e dby de wa ndf r os ta spa r tofwe a t he r i ngpr oc e s s e s . Ze uge nsma ybea shi gha s30me t e r si nhe i ght . Wi t ht i met hef ur r owsa r ewi de ne da ndt hez e uge nsl owe r e da nd c ons e que nt l yt he ya r eunde r c uta ndwor na wa ya st hewi nde r os i on a ndot he rde nuda t i onpr oc e s s e sc ont i nuet oa c tont he m. Ya r da ng Ya r da ngsa r er i dge sma deofr e s i s t a ntr oc kwhi c ha r ede ve l ope d a ndl i epa r a l l e lt ot hedi r e c t i onoft hepr e va i l i ngwi nd. Whe nba ndsofr e s i s t a nta ndwe a kr oc ksl i epa r a l l e lt ot he pr e va i l i ngwi nd, Wi nda br a s i onpr oduc e sa not he rf or mof“ r i dgea ndf ur r ow” l a nds c a pes i nc et hewe a kba ndsa r er e a di l ye r ode dt ol e a vet he mor er e s i s t a ntba ndso fha r dr oc kst os t a nda sya r da ngs . The s eya r da ngr i dge sva r yi nhe i gh tf r om5t o15me t e r sa ndc a n bea sl onga saki l ome t e r . The s el a ndf or msa r eus ua l l yunde r c utont he i rwi ndwa r ds i de s . Ya r da ngsc a nbef oundi nAl ge r i aa ndEgypt . Roc kPe de s t a l . The s ea r emus hr oom/ t owe r l i kes ha pe df e a t ur e sf or me da sar e s ul t ofwi nda br a s i on. Si nc et hes a ndbl a s t i ngofwi ndi nde s e r t si smos t l yc onf i ne dt oa me t e ra ndbe l owf r omt hegr ound, Roc ksa r eunde r c ut . The s er oc ksa r eus ua l l yma deupl a ye r swi t hdi f f e r i ngha r dne s s r e s ul t i ngi nt hes of t e rpa r t sbe i ngwor na wa ya tamor er a pi dr a t e r e s ul t i ngi nt hef or ma t i onofpe de s t a l s . Cont i nue de r os i onl e a dst ot hee ve nt ua lc ol l a ps eoft hepe de s t a l . Ane xa mpl ei sMuka r ob( “ Thef i nge rofGod. ” )whi c hwa sl oc a t e d i nt heNa mi bDe s e r tbe f or ei t se ve nt ua lc ol l a ps ei n1988. ZI MSECOLe ve lGe ogr a phyNot e s :HotDe s e r t s :I ns e l be r gs The s ea r er oundt oppe dmoundsofr oc kf oundi nde s e r t sa sar e s ul t ofpe r s i s t a ntwi nde r os i onove rl ongpe r i odsoft i me . I ns omede s e r t ss uc ha st heNa mi bde s e r t ,wi nde r os i onha s r e move da l lt h eor i gi na ls ur f a c el e a vi ngi s ol a t e dpi e c e sofr oc kt ha t s t a ndupa sr oundt oppe dma s s e s . Someoft he s ei ns e l be r gsma ybear e s ul tc ombi ne dwi nda ndwa t e r e r os i onf ore xa mpl er e ma i nsofpl a t e a ue dge sma ybec utba c kby we a t he r i nga f t e rt he ya r ee xpos e dbys he e twa s h. Ta l us( s c r e e / l oos er oc ksr e s ul t i ngf r omwe a t he r i nga ndma s s wa s t i ng)a c c umul a t e da tt heba s eo ft hes l opea ss hownont her i ght ha ndoft hepho t ogr a ph) Thedi a gr a msbe l ows howt hef or ma t i onofa ni ns e l be r ga ndkopj ei n de s e r tc ondi t i ons . I ns e l be r g I nmos tde s e r t snor a i ndoe snotf a l lf ors e ve r a lye a r s . Whe ni tdoe si tc ome si nt hef or mofune xpe c t e da ndi nf r e que nt downpour s . The r e f or ede s pi t et hel owr a i nf a l lt ot a l s( a bout250mmpe ra nnum) , wa t e ri ss t i l ladomi na nta ge ntofe r os i ona ndde pos i t i on. Thi si se s pe c i a l l yt r uei ns e mi a r i dde s e r t sl i ket heKa l a ha r iwhe r e r a i nf a l l smor ef r e que nt l y. De wa l s of or msi nde s e r t swhe r et e mpe r a t ur e s ,duet or e l a t i ve l y l i t t l ec ove rr e s ul t i ngi nt e mpe r a t ur e sf a l l i ngbe l owde wpoi nt ,i s a l s of oundi nde s e r t swhe r ei tpl a ysa ni mpor t a ntr ol ei nc he mi c a l we a t he r i ng. Thei nf r e que ntbutvi ol e ntt hunde r s t or msr e s ul ti nr us hi ngt or r e nt s i ns t e e ps l ope sa ndt os he e tf l oodsonge nt l es l ope s . Ther unof fi smor epr onounc e dduet ot her e l a t i vel a c kof ve ge t a t i oni nde s e r tl a nds c a pe s . Ther unof fons t e e ps l ope si sus ua l l yi nt hef or mofr i l l s / s ha l l o w gr oove swhi c hl i nkupt of or mgul l i e s . The s el e a di nt ur nt owa di s / c he bka s Dur i ngt he s es t or mswa t e rma yf l owi nt he s ewa di sa sf l a s hf l o ods a nda st he ypr ogr e s sa ndc a r r ymor ea ndmor ema t e r i a l st he yma y t ur ni nt omudf l ows . Themudi sl a t e rde pos i t e da ndf or msf e a t ur e sknowna sa l l uvi a l f a ns . Pa s tpl uvi a lpe r i ods Eve nt houghs omepl a c e si nde s e r t sdonotr e c e i ver a i na ta l lf or ye a r sone nd, The r ei se vi de nc ef ore xa mpl e ,pa l e ol i t hi cma r ksons omede s e r t r oc ks , Thi se vi de nc epr ove st ha tde s e r t sha dmor epl uvi a l( humi d) c ondi t i onst ha tc ur r e nta r i dc ondi t i onsi nt hepa s t . Somewa di s ,dr yr i ve rc ha nne l sa n dgul l i e sma yha vebe e nf or me d dur i ngt he s epl uvi a lpe r i ods . ZI MSECOLe ve lGe ogr a phyNot e s :Wa di sa ndBa ha da s Wa di s / Ca nyons Asa l r e a dypoi nt e doutf r e a ks t or msoc c uri nde s e r t sc ha r a c t e r i s e d bye xc e s s i vepr e c i pi t a t i onove rs ho r tpe r i odsoft i me . Duet oi nf i l t r a t i one xc e s sf l owa nde ve ns a t ur a t i one xc e s sf l ow t he r ei ss i gni f i c a ntr unof fi nt hef or mofs he e tf l oods , Thi sf l owoc c u r si nt hef or mofr i l l swhi c hl a t e rj oi nt of or mgul l i e s whi c hi nt ur nf or mi nt owa di s , The s ea r ede e pc a nyonsr e s ul t i ngf r oms us t a i ne de r os i on,t heha ve s t e e pba nksa ndf l a tf l oor s . Att i me st hef l oorma yha vema t e r i a lde pos i t e dbys t r e a mf l oo ds . Wa di sma ya l s obef or me dbys t r e a mf l oodswhi c he r odeva l l e y s i de sa l t houghs omewa di sc a nbedr ya ndonl yha vewa t e rdur i ng a ndi nt hei mme di a t ea f t e r ma t hoft he s es t or ms . Ane xa mpl ei st heGr a ndCa nyoni nt heUni t e dSt a t e s . Al l uvi a lf a ns / Ba ha da s / Ba j a da s Dur i ngt hes ud de nr a i ns t or ms Fl a s hf l oodsr us hdownt hewa di s , The yc a r r yl a r gea mount sofma t e r i a l si nc l udi ngal otofs i l t( a l l t hi sma t e r i a li sr e f e r r e da l l uvi um)f or mi ngamudf l ow Ast hewa t e rdi s s i pa t e sa f t e rt hee n doft hes t or ma ndwhe ni t s l oos e si t se ne r gyuponr e a c hi ngl e s ss t e e ps l ope st hea l l uvi umi s de pos i t e dt of o r mf a ns ha pe df e a t u r e sa tt heba s eoft hepi e dmont z one . De s e r tpi e dmontz one I sma deupofwa t e rl a ndf or msf or me dbye r os i on,t r a ns por t a t i on a ndde pos i t i on. Thel a ndf or msf oundont hepi e dmontz onei nc l ude :mount a i n f r ont ,ba ha da ,pe r ipe d i me nt ,pl a yaa ndr oc kpe di me nt . Fe a t ur e sofapi e dmontz one . Mount a i nFr ont I ti sf or me da sar e s ul tofe r os i ona l ongas t e e ps l opea nd s ome t i me sa sar e s ul tofhe a dwa r de r os i on. I tma ya l s obeama deupofl a r ger oc kboul de r sr e s ul t i ngf r om we a t he r i ng. Ba ha da Ade pos i t i ona lf e a t ur es e ea bove . Kni c kpoi nt As ha r pc ha ng ei npr of i l et ha tma r kst het r a ns i t i onf r omt he mount a i nf r onti nt oape di me nt . Roc kpe di me nt I ti st hege nt l es l opet ha ts t a r t sa tt hekni c kpoi nta tt hef ootoft he mount a i n. Thi sma ybema deoutofba r er oc kori tc a nbec ove r e di na l l uvi um de pos i t e ddur i n gf l ood s . Pe r i pe di me nt I ti sma deupo fde pos i t e dma t e r i a lwa s he da c r os st hepe di me nt . Thepe r ipe di me nti sade pos i t i ona lf e a t ur et ha ti sf or me di nt h e s a mewa ya sba j a da sb uti ti sl a r ge r . Pl a ya ZI MSECOLe ve lGe ogr a phyNot e s :Me s aa ndBut t e Me s a sa ndbut t e sa r ef l a tt oppe dupl a ndswi t hs t e e ps i de sa ndof t e n c a ppe dbyha r dr e s i s t a ntr oc ks . Me s a sa ndbut t e sa r ede s e r tf e a t ur e sc r e a t e dpr i ma r i l ybyr i ve r e r os i oni nde s e r t sbutc a r ve da wa yf ur t he rbyde s e r twe a t he r i ng pr oc e s s e sa swe l la swi nd( a e ol i a n)pr oc e s s e s . The ya r ef or me df r omwha ta r eor i gi na l l ypl a t e a ust ha ta r ec uti nt o t wobyr i ve r s . The s ef e a t ur e sc a nbequi c kl yf or me dbe c a us ede s e r tr i ve r sha vea l otofe r os i vepowe rowi ngt ot hel a c kofve ge t a t i on,t hes udde n a ndhe a vys t or mst ha tr e s ul ti nvi o l e ntdownpour sa ndf e r oc i ou s r unof fa ndt hea br a s i v ema t e r i a lt ha ti sr e a di l ya va i l a bl ei nde s e r t s . Me s s a sha veabr oa de rt opc ompa r e dt obut t e s . The ya r eus ua l l ydi s s e c t e dbywa di s . We a t he r i ngpr oc e s s e spi l eups c r e e / t a l usa tt he i rba s e s . But t e sc a nbef or me dbyme s a st ha tha vebe e nc a r ve dbye r os i on. ZI MSECOLe ve lGe ogr a phyNot e s :Pl a ya s The s ea r es ome t i me sknowna si nl a nddr a i na geba s i ns . Duet ot hef a c tt ha tt he r ea r enope r ma ne ntdr a i na gepa t t e r nsi n de s e r t sa nyr a i nt ha tf a l l se i t he re va por a t e sori nf i l t r a t e si nt ot he s oi lorr unsof fa nddr a i nsi nt oba s i ns . Ba s i nsa r ede pr e s s i ons . Whe nr a i nf a l l st e mpor a r yr i ve r st ha tf l owi nc a nyons / ba ha da sa r e f or me da ndt he s ema ye ve nt ua l l ydr a i ni naba s i n/ de pr e s s i on. The s er i ve sf or ml a ke si nt he s ede p r e s s i ons . Whe nt he s el a ke sdr yupduet oe va por a t i ont he ya r et ur ne di nt o s a l tf l a t s . The s et e mpor a r yl a ke sa nds a l tf l a t sa r eknowna spl a ya sor s e bkha s . Exa mpl e soft he s ec a nbef oundi nt heSa ha r ade s e r t . Whe na l l uvi umi sde pos i t e da tt hee dgea ndove r l i e st hee dgeof t hepe di me nta r oundt h epl a yai ti sknowna sape r i pe di me nt . Mos tde s e r t sa r ec ha r a c t e r i s e dbyi nl a nddr a i na geba s i nsa sf e w r i ve r se . g.t heNi l eha vee noughwa t e rs uppl yt of l owa ndpe r s i s t t hr ought hede s e r t s . Mos tf or mi nl a nddr a i na geba s i ns / l a ke s / pl a ya s . ZI MSECOLe ve lGe ogr a phyNot e s :Huma nAc t i vi t i e si nDe s e r t s I ns pi t eoft he i rhos t i l ee nvi r ome nt sbr oughta boutbya r i di t y l e a di ngt os hor t a geofwa t e r ,pa s t ur e ,woodf ue la ndot he rwood r e s our c e s ,r e mot e ne s s ,i nf e r t i l ea nds a l t ys oi l s ,di s r upt i vedus t s t or msa ndt e mpe r a t ur ee xt r e me smos tpe opl es t i l lc hoos et os e t t l e t he r ea nde nga gei nva r i ouse c onomi ca nda gr i c ul t ur a la c t i vi t i e s . The s ea c t i vi t i e si nc l udenoma di cpa s t or a l i s ma ndot he rf or msof a gr i c ul t ur e ,oi ldr i l l i nga ndot he rf or msofmi ne r a le xpl oi t a t i on. Huma na c t i vi t i e s Huma ns e t t l e me nt sa ta qui f e r sa ndoa s i s . Ana qui f e ri sapl a c ewhe r et hewa t e rt a bl ei shi ghe ra ndi nt e r s e c t s wi t ht hes ur f a c et husa l l owi ngpe op l et out i l i s et hewa t e ri nt he f or mofi r r i ga t i on,dome s t i ca ndi n dus t r i a lus e . Mos tde s e r ts e t t l e me nta r eus ua l l yne a rwa t e rs our c e s . Ac t i vi t i e sus ua l l yi nvol vet hegr owi ngofpa l mt r e e sorpa s t or a l i s m f ore xa mpl et hepe opl eofSa he la n dt heBe j ape opl eoft heSa h a r a de s e r t . The r ea r ea l s os omep e r e nni a lr i ve r st ha tt r a ns ve r s ede s e r t sa n d pe opl et e ndt os e t t l ea l ongt he i rba nksa st her i ve r sa c t sa sal i f e l i ne . Ane xa mpl ei st heNi l eRi ve ra r oundwhi c hc i vi l i s a t i onsha ve e xi s t e df ormi l l e nni awi t ha c t i vi t i e ss uc ha si r r i ga t i onus i ngt he s ha dufa nda r c hi me de ss c r e wha vebe e npr a c t i c e df orc e nt ur i e sa nd c ont i nuee ve nt oda y. Cot t oni sgr owni nt hes e mi a r i da n di nhos pi t a bl eAwa s hva l l e yi n Et hi opi as ome t hi ngma depos s i bl ebyi r r i ga t i ons c he me s . Da msc a na l s obec ons t r uc t e dt oe a s ewa t e rs hor t a ge s ,pr ovi de Hydr oe l e c t i cpowe ra ndc ont r olf l oodi nga ne xa mpl ei st heAs wa n Da mi nEgypt . Va r i ousr oa dsa ndr a i l wa yl i ne sha vebe e nc ons t r uc t e da c r os s de s e r t sa l l owi ngf ort h ef a s tt r a ns p or t a t i onofgoodsa c r os sde s e r t s wi t houtr e l yi ngonc a me l s .Ahi ghwa yl i nksEt hi opi a nr e gi onswi t h Egypta ndi sus e dt ot r a ns por tc ot t o nf r omt heEt hi opi a nf i e l dst o Egypt i a nma r ke t s . Thede ve l opme ntofs a t e l l i t et e c hnol ogi e ss uc ha l l owspe opl ei n r e mot epa r t soft hede s e r t se . g.Oi lf i e dst ous et he s ede vi c e st o c ommuni c a t ewi t hot he rpa r t soft h ewor l dt husr e duc i ngt he r e mot e ne s soft her e gi ona ndi mpr ovi ngt hef l owofi nf or ma t i on. Agoodpor t i onoft hewor l d’ soi lf i e l dsa r ea l s of oundi nde s e r t r e gi onsa ndc ount r i e sl i keSa udiAr a bi a ,Li byaa ndt heUni t e d Ar a bEmi r a t e sc a nma keal i vi nga ndha vee ve nt hr i ve da sar e s ul t oft heOi lbooml e a di ngs omet or e f e rt oOi la st hebl a c kgol d. La r gea mount sofi nc omede r i ve df r ommi ne r a l sa r eus e dt o de ve l opt he s ena t i ons ’i nf r a s t r uc t u r e . Se t t l e me nt sha vea l s of or me da r oundl a r geoi lf i e l dswi t hs ome e ve ne vol vi ngi nt ope r ma ne ntt ownsa ndc i t i e s . Ot he rmi ne r a l ss uc ha sopa l sc a na l s obef oundi nde s e r t sa ndc a n l e a dt os e t t l e me nt sf ore xa mpl eCoobe rPe dyi nAus t r a l i a . Townsa ndc i t i e st ha tor i gi na t ef r omt hei nf l uxofpe opl ea sar e s ul t ofmi ne r a ldi s c ove r ya r eknowna sBoomt owns . Se t t l e me nt sof t e ni nc l u des pe c i a l i s e dhous e ss uc ha st hos ema de f r ommudwhi c hma ke sc ool e ra ndmor ehos pi t a bl et ha nt he t r a di t i ona lde s i gnsf ou ndi not he rp a r t soft hewor l d. De s e r t sa l s oof f e rc l e a rs ki e st ha tc a nbei de a lf orf i l mi ng,mi l i t a r y e xe r c i s e sa ndwe a ponst e s t i ng,s ol a rpowe rge ne r a t i ona ndwi n d powe rge ne r a t i on. Mot ors por t i nga c t i vi t i e sa r ea l s oh e l di nde s e r t s . Pl a c e sl i ket heVa l l e yofKi ngsa r epopul a rt our i s ts por t s . Ar c he ol ogi c a ls i t e sa l s oa boundi nde s e r t s . Us i ngmone yf r omOi lr e c r e a t i ona lf a c i l i t i e s ,mode r nr oa ds , r a i l wa yl i ne s ,c i t i e sa ndot he ri nf r a s t r uc t ur eha sbe e nbui l ti nt he mi ds tofde s e r t sf ore xa mpl eDuba ii nt heUni t e dAr a bEmi r a t e s . TheBe doui nn oma dsa l s oe nga gei nc r os sde s e r tt r a di nga c t i vi t i e s wi t hva r i oust r i ba lgr oups . De s a l i na t i onpl a nt sha vea l s obe e ns e tupt opur i f ywa t e rf r omt he s e aa ndma kef i tf ori ndus t r i a la nddome s t i cus e . ZI MSECOLe ve lGe ogr a phyNot e s :De s e r t i f i c a t i on Theme a ni ngofde s e r t i f i c a t i on De s e r t i f i c a t i onl i t e r a r yme a nst hema ki ngofde s e r t sa nds e ve r a l de f i ni t i onsha v ebe e nof f e r e df ort h et e r ma l le xpr e s s i ngt hi si d e a . De s e r t i f i c a t i onr e f e r st ot hes pr e a dofde s e r tc ondi t i onsf or e xa mpl er e s ul t i ngi na r i di t yors e mi a r i dc ondi t i onsa nds c a nt ve ge t a t i onc ove ri nt hee nc r oa c he da r e a . De s e r t i f i c a t i oni st he r e f or et hes pr e a dofde s e r t sa swe l la sa r e duc t i oni nt hebi ol ogi c a lpr oduc t i vi t yofagi ve npi e c eofl a nd. I ti sa l s oa t t r i but e dt oapr oc e s sbywhi c hpr e vi ous l ypr oduc t i v e l a ndt ur nsi nt oade s e r tl i kel a nda n di t sa gr i c ul t ur a lpr oduc t i ve ne s s dr opsbyt e npe r c e ntormor eduet ona t ur a la ndhuma nf a c t or s . Amor ec ompr e he ns i vede f i ni t i onmi ghtde f i nede s e r t i f i c a t i ona s a ne nvi r ome nt a lde gr a da t i onpr oc e s sbr oughta boutbybot hna t ur a l c a us e s( e . g.c h r oni cdr ought s )a nde xc e s s i vehuma na c t i vi t i e s( s uc h a sc l i ma t ec ha ngea ndde f or e s t a t i on)r e s ul t i ngi nt hef a l li n pr oduc t i vi t yofagi ve npi e c eofl a nda ndt hes pr e a dofde s e r tl i ke c ondi t i onst ot hea f f e c t e dpi e c eofl a nd. Na t ur a lf a c t or st ha tl e a dt ode s e r t i f i c a t i on Cl i ma t ec ha ngef ore x a mpl ear e duc t i oni nt hea mountofr a i nf a l l r e c e i ve da tagi ve na r e aori nc r e a s e si ne va pot r a ns pi r a t i onr a t e sc a n l e a dt ode s e r t i f i c a t i on. TheElNi noe f f e c tr e s ul t i ngi ndr ought s . Ac i dr a i nl e a dst ot her e duc t i onofl a ndpr oduc t i vi t y. Al a nd’ sdi s t a nc ef r omt hes e a . Cont i ne nt a ldr i f tf ore x a mpl emos toft heSa ha r ade s e r te nj oye d pl uvi a lpe r i odsdur i ngt hes oc a l l e dQua t e r na r ye r awhe nt he Af r i c a npl a t ewa sf ur t he rs out ht ha ti tc ur r e nt l yi sa ndt heSa ha r a r e gi onoc c upi e dt hel a t i t ude sc ur r e nt l yoc c upi e dbyt hepr e s e ntda y Sa va nna hr e gi ons . Huma nf a c t or s De f or e s t a t i ona spe opl ec utdownt r e e sf orus ea sf i r e wood, t ha t c hi ng,ma ki ngf ur ni t ur ea ndot he ri ndus t r i a la nddome s t i cus e s . Thec l e a r i ngofl a ndf ora gr i c ul t ur a lus e . Ove r gr a z i ngf o re xa mpl ei nt heSa he lr e gi on. Ove r popul a t i ona smor epopul a t i oni nc r e a s e sa r enotma t c he dwi t h i nc r e a s e si nr e s our c e s . Expa ns i onofhuma ns e t t l e me nt ss u c ha st ownsa ndl a ndi sc l e a r e d f ori ndus t r i a la ndr e s i de nt i a lus e . Mi ni nga c t i vi t i e sf ore xa mpl eope nc a s tmi ni nga ndoi lmi ni ng whi c hl e a dst ooi ls pi l l sa ndde s t r uc t i onofve ge t a t i on. Sa l i ni s a t i onwhi c hma ke ss oi l sl e s sf e r t i l ea ndma ke sve ge t a t i on gr owt hi mpos s i bl e . NBHuma nf a c t or sa ndNa t ur a l( Phys i c a lf a c t or s )of t e nc ombi net o pr oduc ede s s e r t sdur i ngt hede s e r t i f i c a t i o npr oc e s s . Ef f e c t sofde s e r t i f i c a t i on Ar e duc t i oni nve ge t a t i vec ove rdu et ode f or e s t a t i ona nddr ought . Ba r r e ns a ndys oi l sa nds ome t i me ss oi lha r de ni ng. I nc r e a s e ds ur f a c er unof fduet or e d uc e dve ge t a t i vec ove rr e s ul t i ng i nt hef or ma t i onofgul l i e sa nddonga s . Re duc e ds oi lf e r t i l i t y. Re duc e dpr oduc t i vec a pa c i t yofa gr i c ul t ur a ll a nd. Re duc e dl a ndc a r r yi ngc a pa c i t y. De a t hofl i ve s t oc ka sar e s ul tofwa t e ra ndpa s t ur es hor t a ge . Wa t e ra ndpa s t ur es hor t a ge s . Fa mi nea nds t a r va t i on. Re duc t i oni na nnua lr a i nf a l la ndpe r s i s t e ntdr ought s . Exa mpl eofde s e r t i f i c a t i on( Sa he lRe gi on) TheSa he li st h es e mi a r i dt r a ns i t i onr e gi onbe t we e nt heSa ha r a de s e r tt ot henor t ha ndwe t t e rr e gi onsofe qua t or i a lAf r i c at ot he s out h. I te xt e ndsf r omt heAt l a nt i ci nt hewe s tt ot heI ndi a noc e a ni nt he e a s t . I t sa nnua lr a i nf a l lva r i e swi de l yf r omye a rt oye a r ,a ndt hel a nd c ons i s t sofs t a bi l i z e da nc i e nts a nds e a si soneoft hepoor e s ta nd mos te nvi r onme nt a l l yde gr a de da r e a soft hewor l d. I tf or msabounda r ybe t we e nt heSa ha r aa ndt hemor ewe t t e rpa r t s ofAf r i c a . TheSa ha r ade s e r ti ss l owl ye nc r oa c hi ngonSa he ll a ndduet o ove r popul a t i ona ndove r gr a z i ng,pe r s i s t e ntdr ought s ,e r r a t i c r a i nf a l la ndc l i ma t ec ha nge . Thea r e aha sbe e npl a g ue dbype r s i s t e ntdr ought s . Thedr oughtwa spa r t l yc a us e dbyna t ur a lc a us e si nt hef or mof c l i ma t ec ha nge . Theha r ma t t a nwi ndst ha ta f f e c tt hea r e aa r edr ybe c a us et he yc ome f r omt heAt l a smount a i ns . Huma na c t i vi t i e sha vea l s oc ont r i but e dt ot hede s e r t i f i c a t i oni nt he a r e a . Thepe opl eoft her e gi onpr a c t i c eNoma di cpa s t or a l i s m,movi ng f r ompl a c et opl a c el oo ki ngf orf r e s hpa s t ur e s . Thi smove me n tha sc a us e dde f or e s t a t i ona ndove r gr a z i nga smor e a ndmor ea ni ma l sgr a z e dr e pe a dl e yont hes a mepi e c eofl a nd. Thi sr e s ul t e di nt hede gr a da t i onoft hel a ndwhos epr oduc t i vi t y de c r e a s e d. Thi sme a ntt ha tl e s spr oduc t i vel a ndwoul dbea va i l a bl ewhi l et he numbe rofa ni ma l ske e pta ndke e psi nc r e a s i ngwor s e ni ngt he s i t ua t i on. Ef f e c t sofde s e r t i f i c a t i oni nt heSa he l Dr yi ngupofwe l l sa nds pr i ngs De s t r uc t i onofpa s t ur e s . Los sofl i f eduet odr ought sa ndf a mi ne .Aqua r t e roft hepe op l ei n t her e gi ondi e di nt hed r ought soft he1970s . Ama s s i vei nf l uxofr e f uge e si nt ot hea dj a c e ntc ount r i e sofMa l i a ndNi ge rr e s ul t i ngi ns e mi pe r ma ne ntc a mpswhi c hus ua l l yha ve uns a ni t a r yl i vi ngc ond i t i ons . Los sofl i ve l i hooda sa ni ma l sdi e d. Re a c t i on UNESCOhe l dame e t i ngi nNa i r ob iKe nyat oa l e r tt hewor l da bout t hedi s a s t e r . The ya l s opr ov i de df ooda ndwa t e rt ot hea f f e c t e dpe opl e . Ot he ri nt e r na t i ona lr e l i e fa ge nc i e ss uc ha sUNI CEFa ndt heRe d Cr os swe r ei nvol ve d. Conc e r t e de f f or t sha vea l s obe e nma det oe duc a t et hepe opl eof Sa he lont hee f f e c t s ZI MSECOLe ve lGe ogr a phyNot e s :Me t hodsofpr e ve nt i ng de s e r t i f i c a t i on. Thef ol l owi ngme t hodsc a nbeus e dt opr e ve nta nds l owdownt her a t eof de s e r t i f i c a t i on: Af f or e s t a t i ont ha ti spl a nt i ngt r e e swhe r enonepr e vi ous l ye xi s t e d. Fa l l owi nga l l owi ngf i e l dst of a l l owi ns t e a dofgr owi ngc r opson t he mc ont i nuous l y. Le gi s l a t i onpa s s i ngl a wst ha tf a vourc ons e r va t i vef a r mi ngme t hods a ndpr a c t i c e sa ndpe na l i s e st hos ewhodonotf ol l owt hepr a c t i c e s . Educ a t i ngpe opl ea boutt hei mpa c tofpoorf a r mi ngme t hodsa nd s c hool i ngt he mont hebe s tf a r mi ngme t hodsa va i l a bl et ot he m. Pl a nt i ngt r e e sl i ne sf ore xa mpl egumt r e e st oa c ta swi ndbr e a ks a ndl e s s e nt hei mpa c tofwi nde r os i on. Da mc ons t r uc t i onf orus ei ni r r i ga t i ons c he me sa ndt opr ovi de a l t e r na t i vehydr oe l e c t r i ce ne r gyi n s t e a dofr e l yi ngonf i r e wood. Pr a c t i c ei r r i ga t i onf ore xa mpl eus i n goa s e sa ndr i ve r ss uc ha st he Ni l eRi ve r . Li mi ts e t t l e me nt sne a rwa t e rs our c e ss uc ha soa s e s . Cons t r uc tc ont our st oc ons e r vel a nda ndl e s s e nt hee f f e c t sof e r os i on. Te r r a c i ngt ol e s s e nt hei mpa c tofe r os i on. Pa ddoc ki ngt oi mpl e me ntc ont r ol l e dgr a z i nga ndpr e ve nt ove r gr a z i ng. Pr a c t i c ec r opr ot a t i on. Cr e a t es a nde mba nkme nt s . Fe nc i ngt opr ot e c tf or e s t s . Gr owdr oughtr e s i s t a n tc r opss uc ha ss or ghumorpr a c t i c ea c t i vi t i e s s uc ha se xt e ns i vec a t t l er a nc hi ngt ha tputl e s spr e s s ur eonpa s t ur e s . Us ea l t e r na t i ves our c e soff ue li ns t e a doff i r e woodf ore xa mpl eLP Ga s . ZI MSECOLe ve lGe ogr a phyNot e s :I nt r oduc t i ont oWe a t he ra nd Cl i ma t e We a t he r t hes t a t eoft hea t mos phe r ea tapa r t i c ul a rpl a c ea ndt i mea s r e ga r dshe a t ,c l oudi n e s s ,dr yne s s ,s uns hi ne ,wi nd,r a i n,e t c .Thewe a t he r i sa l la r oundus ,a l lt het i me .I ti sa ni mpor t a ntpa r tofourl i ve sa ndo ne t ha twec a nnotc ont r ol . Cl i ma t e -me a nwhi l ei sde f i ne da st hewe a t he rc ondi t i onspr e va i l i ngi na n a r e ai nge ne r a lorove ral on gpe r i od.I ti st hel ongt e r mwe a t he rpa t t e r n ofagi ve na r e a .I ti se s pe c i a l l yi mpor t a nti na c t i vi t i e ss uc ha s a gr i c ul t ur e .I ti sme a s ur e dbya s s e s s i ngt hepa t t e r nsofva r i a t i oni n t e mpe r a t ur e ,humi di t y,a t mos phe r i cpr e s s ur e ,wi nd,pr e c i pi t a t i on, a t mos phe r i cpa r t i c l ec ounta ndot he rme t e or ol ogi c a lva r i a bl e si nagi ve n r e gi onove rl ongpe r i odsoft i me . Di f f e r e nc e sbe t we e nwe a t he ra ndc l i ma t e Cl i ma t e De s c r i be st hea ve r a ge c ondi t i onse xpe c t e da ta s pe c i f i cpl a c ea tagi ve n t i me . We a t he r De s c r i be st hea t mos phe r i cc ondi t i onsa ta s pe c i f i cpl a c ea tas pe c i f i cpoi nti nt i me . We a t he rge ne r a l l yr e f e r st oda yt oda y t e mpe r a t ur ea ndpr e c i pi t a t i ona c t i vi t y( e . gr a i n Cl i ma t e We a t he r ors now) Me a s ur e dove ral ong Me a s ur e df ors hor tt e r me . gonada yt oda y pe r i odt ypi c a l l y30ye a r s .ba s i s Thes t udyoft hec l i ma t e Thes t udyofwe a t he ri sc a l l e dme t e or ol og y. i sc a l l e dc l i ma t ol ogy. El e me nt sofwe a t he ra ndt he i ri ns t r ume nt sa nduni t sofme a s ur e me nt Zi mba bwe a nst ypi c a l l yus et heme t r i cs y s t e mofme a s ur e me ntf or e xa mpl eme t e r sf ordi s t a nc ea ndki l ogr a msf orwe i ght .We a t he ri sma de upofs e ve r a le l e me nt ss uc ha st e mpe r a t ur ewhi c ha r eme a s ur e dus i ng va r i ouss pe c i l i z e di ns t r ume nt sa nde xpr e s s e di nt he i runi t s .Whi l et he me t r i cuni t si sc ommoni nmos ta r e a sofourl i ve s ,we a t he re l e me nt sa r e s ome t i me sme a s ur e di ni mpe r i a luni t sf o re xa mpl ewi nds pe e di s me a s ur e di nknot s .I not he ri ns t a nc e sdi f f e r e ntc ount r i e sus edi f f e r e nt uni t s . Fore xa mpl et heUni t e dSt a t e sus e sDe gr e e sFa hr e nhe i tt ome a s ur e t e mpe r a t ur e .I nt her e a lwor l dyous houl ds t udyt heuni tus e dt oe xpr e s s we a t he rc a r e f ul l ybe f or ema ki ngc ompa r i s onsf ore xa mpl eat e mpe r a t ur e of45° F( a r ound7° C) c oul dbede s c r i be da sc oolwhi c hi snotwha tyou woul dt hi nki fyouj us tt houghtofi ta s4 5° C“ hot ”whi c hi sa t e mpe r a t ur ea s s oc i a t e dwi t hhotde s e r t s . Thef ol l owi nge l e me nt sa r es omeoft hemos tc ommonl yus e dt oe xpr e s s we a t he r . Te mpe r a t ur e -Si x’ st he r mome t e ro t he r wi s eknowna st he ma xi muma ndmi ni mumt he r mome t e r .I ti se xpr e s s e di nDe gr e e s Ce l s i us . Humi di t yHyd r ome t e r / ps yc hr ome t e r / s a t e l l i t e s Humi di t yi s me a s ur e da sape r c e nt a ge .Se eHumi di t yf ormor ede t a i l s . Pr e s s ur e i sme a s ur e dus i ngaBa r ome t e ra nde xpr e s s e di nmi l l i ba r s . Wi nddi r e c t i on Wi ndVa ne -i ti se xpr e s s e dus i ngt hec a r di na l poi nt sofac a mpuse . gSE. Wi nds pe e dCu pa ne mome t e ra nde xpr e s s e di nknot s . Suns hi ne s uns hi ner e c or de ra ndi ti se xpr e s si nhour sa ndmi nut e s . Cl oudc ove r ob s e r ve dus i ngt hee ye sa ndi sme a s ur e di nOkt a s . We a t he rr e por t as ys t e ma t i cs t a t e me ntoft hee xi s t i nga ndus ua l l yt hepr e di c t e d me t e or ol ogi c a lc ondi t i onsove rapa r t i c ul a ra r e a . Thei nf or ma t i o ni sobt a i ne df r omawe a t he rs t a t i one . gKut s a g a . We a t he rf or e c a s t I sapr e di c t i onofwe a t he rphe nome na ,t r e nda nde ve nt s . We a t he rf or e c a s t sa r ema debyc ol l e c t i nga smuc hda t aa spos s i bl e a boutt hec ur r e nts t a t eoft hea t mos phe r e( pa r t i c ul a r l yt he t e mpe r a t ur e ,humi di t ya ndwi nd)a ndus i ngunde r s t a ndi ngof a t mos phe r i cpr oc e s s e s( t hr oughme t e or ol ogy)t ode t e r mi neho w t hea t mos phe r ee vol ve si nt hef ut ur e . t hec ha ot i cna t ur eoft h ea t mos phe r ea ndi nc ompl e t eunde r s t a ndi ng oft hepr oc e s s e sme a nt ha tf or e c a s t sbe c omel e s sa c c ur a t ea st he r a ngeoft hef or e c a s ti nc r e a s e s . I nf or ma t i onga i ne df r omt heobs e r va t i onsi sus e di nc onj unc t i on wi t hc ompl i c a t e dmode l sa ndc omput e rs i mul a t i onsa r eus e dt o pr e di c tf ut ur ewe a t he r . I mpor t a nc eofwe a t he rt ope opl e Pe opl ec a nbema dea wa r eofl oomi ngwe a t he rha z a r dss uc ha s t hunde r s t or msa ndc yc l one sa ndt a kepr e c a ut i ona r yme a s ur e ss uc h a se va c ua t i ngt hea r e a st ha twi l lbea f f e c t e d. Sot ha tpe opl ec a nknowwhi c ht ypeofc l ot he st owe a rf ore xa mpl e whe t he rt oc a r r yar a i nc oa torumbr e l l aornot . Fa r me r sc a nma kemor ei nf or me dpl a nni ngde c i s i onse . g.whe nt o s pr a y,pl a ntorha r ve s t . Pi l ot sknowwhi c hr out e st ot a kewhe nf l yi nga ndhowt ol a nda nd t a keof f . Whe nma ki ngs por t i ngc a l e nde r sf ore xa mpl ega me sl i kec r i c ke t a r ehuge l ya f f e c t e dbywe a t he rs owec a nc hoos et opl a yi ndoo r s por t si ns t e a d. ZI MSECOLe ve lGe ogr a phyNot e s :We a t he rSt a t i on Awe a t he rs t a t i oni saf a c i l i t y,e i t he ronl a ndors e a ,wi t hi ns t r ume nt s a nde qui pme ntf orme a s ur i nga t mos phe r i cc ondi t i onst opr ovi de i nf or ma t i onf orwe a t he rf or e c a s t sa ndt os t udyt hewe a t he ra ndc l i ma t e . Mos ti ns t r ume nt sus e di nme a s ur i ngwe a t he re l e me nt sa r ef oundi n awe a t he rs t a t i on. Thi si sapl a c ewhe r ewe a t he re ve nt sa r er e c or de df ore xa mpl e Kut s a gar e s e a r c hs t a t i onne a rHa r a r eI nt e r na t i ona lAi r por t . I ti ss i t ua t e di na nope ns pa c ea wa yf r ombui l di ngsa ndt r e e s . Tr e e sc a na f f e c twe a t h e rphe nome naf ore xa mpl ebya c t i nga swi nd br e a kst husa f f e c t i ngt hewi ns pe e da nddi r e c t i onr e a di ngs . Bui l di nga c ta st he r ma ls i nksi . et he ys t or ehe a te ne r gyt hus di s t or t i nghe a tr e a di ng s . I ns t r ume nt sa ndi t e msf oundi nawe a t he rs t a t i on 1.St e ve ns ons c r e e n. 2.Si x’ st he r mome t e r . 3.Hygr ome t e r . 4.Ba r ome t e r . 5.Suns hi ner e c or de r . 6.Ane mome t e r . 7.Ra i nga uge . 8.Eva por a t i ondi s h. Foral ongt i met e c hni c i a nsha dt ogot ot hewe a t he rs t a t i ona taf i xe d t i mee ve r yda ya ndr e c or dva r i ousme a s ur e me nt ss hownbyt he i ns t r ume nt s ,r e s e tt hei ns t r ume nt sa ndf e e dt heda t ai nt oc omput e r s ma nu a l l y.Thi si sbe c omi ngl e s sc ommona sAut oma t e dWe a t he r s t a t i onsbe c omemor ea ndmor epopul a r .The s es a veont hehuma n e ne r gyr e qui r e dt oma nt he m,c a npr ovi deupt oda t eda t avi at hei nt e r ne t a ndc a nbede pl oye di nha r s hr e mot ea r e a ss uc ha st heAr c t i c sa ndPol a r r e gi ons . ZI MSECOLe ve lGe ogr a phyNot e s :St e ve ns onSc r e e n ASt e ve ns ons c r e e ni sapr omi ne ntf e a t u r eonmos twe a t he rs t a t i ons . I ti sus e dt oho us ewe a t he ri ns t r ume nt s ,f ore xa mpl et hes i x’ s t he r mome t e ra ndhydr ome t e r . I ti spa i nt e dwh i t ei nor de rt or e f l e c te xc e s s i vehe a t . I ti s1. 2me t e r sa bovet hegr oundt oa voi dgr oundwe a t he r c ondi t i onsf r oma f f e c t i ngt her e a di ngsyi e l de dbyt hehous e d i ns t r ume nt s . I tha sl ouve r e ds i de st oa l l owf orf r e ec i r c ul a t i onofa i r . I tha sadoubl er ooft or e duc ee xc e s s i vehe a tf r oms ol a ri r r a di a t i on. I ti sma deofwoodt or e duc ee xc e s s i vehe a t . I tha sme t a ll e gst oa vo i da t t a c ksb yt e r mi t e s .Some t i me st hel e gs a r ema deoft r e a t e dwo odf ort hes a mer e a s on. ZI MSECOLe ve lGe ogr a phyNot e s :Te mpe r a t ur e Theda i l yma x i muma ndmi ni mumt e mpe r a t ur e sa r eme a s ur e d us i ngSi x’ st he r mome t e r( pi c t ur e da bove ) . I twa si nve nt e dbyJ a me sSi xaBr i t i s hs c i e nt i s the nc et hena me Si x’ st he r mome t e r . I ti sa l s oknowna st heMa xi muma ndMi ni mumt he r mome t e r . I ti shous e di naSt e ve ns on’ ss c r e e n . Di ur na lr a ngei st hedi f f e r e nc ebe t we e nt hema xi muma nd mi ni mumt e mp e r a t ur e s . Howi twor ks Whe nt e mpe r a t ur er i s e si tpus he st hea l c oholi nt hel e f tha ndl i mp downa ndf or c e sme r c ur yi nt her i ghtha ndl i mpup. Thea l c oholhe a t supa ndpa r tofi ti sva por i z e dt ooc c upyt he c oni c a lbul b. Ther e a di ngi st a ke nont her i ghtha ndl i mpwhi c hi si nt hel e f t ha ndl i mpc ont r a c t sa nds omeoft h ea l c oholi nt hec oni c a lbul b l i que f i e ss ot ha tt heme r c ur yf l owsi nt heoppos i t edi r e c t i on. Themi ni mumt e mpe r a t ur ei sr e a dj us ta bovet heme t a li nde xon t her i ghtha ndl i mp. Commonpr obl e mse nc ount e r e dwhe nus i ngt hei ns t r ume nt Fa i l i ngt oi de nt i f yme r c ur yora l c o hol . Fa i l ur et oi de nt i f yt hema xi muma ndmi ni mumt he r mome t e r . Re a di nge r r or sf ore xa mpl et a ki ngt heme a s ur e me ntoft he ma xi mumt he r mome t e ra bovet heme t a li nde xa ndt ha toft he mi ni mumt he r mome t e rbe l owt hei nde x. Di gi t a lt he r mome t e r sa r ebe c omi ngmor ea ndmor ec ommon.The ya r e notne c e s s a r i l ymor ea c c ur a t et ha nt het r a di t i ona lme r c ur ya nda l c ohol t he r mome t e r sbutt he ya r ee a s i e rt or e a d. ZI MSECOLe ve lGe ogr a phyNot e s :Humi di t y aqua nt i t yr e pr e s e nt i ngt hea mountofwa t e rva pori nt hea t mos phe r e . I ti sme a s ur e dus i ngahydr ome t e r . Thewe ta nddr ybul bt he r mome t e ri sa l s oknowna sa ps yc hr ome t e r . We a t he rs a t e l l i t e sc a na l s ome a s ur et hea mountofhumi di t yi nt he a t mos phe r e . Ahygr ome t e rme a s ur e st hehumi di t yi nt hea t mos phe r eus i ngt wo t he r mome t e r s :dr ya ndwe tbul bt h e r mome t e r s . Thewe tbul bt he r mome t e ri swr a p pe di nt hi nmus l i na nddi ppe di n ac ont a i ne rofwa t e rt oke e pt hemus l i nc l ot hwe t . I ft hea i ri sdr ywa t e re va por a t e sf r omt hemus l i na ndc ool ss uc h t ha tt heme r c ur yc ont r a c t s . Thedr ybul bi snota f f e c t e dhe nc et het wos howdi f f e r e ntr e a di ngs . Thewe tbul bs howsal owr e a di ngwhi l s tt hedr ybul bs howsa hi ghe rr e a di ng. De pr e s s i on/ Di f f e r e nc e =t her e a di ngoft hedr ybul bl e s st her e a di ng oft hewe tbul bt he r mome t e r . Thehumi di t yi st he nf oundbyr e a di nghumi di t yt a bl e s .For e xa mpl ei ft he r ei snodi f f e r e nc ebe t we e nt het wor e a di ngst he humi di t yi s100% El e c t r oni chygr ome t e r sa r ea l s ous e d.The s ea r ee a s i e rt or e a d. Re l a t i vehumi di t yi sme a s ur e di npe r c e nt a get e r ms . Type sofhumi di t y The r ea r es e ve r a lwa yst ome a s ur ea nde xpr e s shumi di t y: 1.Abs ol ut eHumi di t yt h et ot a lma s sofwa t e rva porpr e s e nti nagi ve n vol umeofa i r . 2.Re l a t i veHumi di t yt hea mountofwa t e rva pori nagi ve nvol umeof a i ra tagi ve nt e mpe r a t ur e . 3.Spe c i f i cHumi di t yt her a t i onoft hema s sofwa t e rva port ot he ma s soft hepa r c e lofa i r . ZI MSECOLe ve lGe ogr a phyNot e s :Pr e s s ur e . i st hepr e s s ur ee xe r t e dbyt hewe i ghtofa i ri nt hea t mos phe r eofEa r t h. I ti sme a s ur e di nmi l l i ba r s .I ti sme a s ur e dus i nga ni ns t r ume ntknowna s aba r ome t e r .The r ea r et wodi f f e r e ntt ype sofba r ome t e r s :t heme r c ur y a nda ne r oi dba r ome t e r s . Me r c ur yba r ome t e r I ti sve r yl a r ge ,t hegl a s st ubei st ypi c a l l ya l mos t1mi nhe i ght . I tgi ve sve r ya c c ur a t er e a di ngs . I tha sabul bt h a ti sdi ppe di nac on t a i ne rofme r c ur y. Whe nt hea t mos phe r i cpr e s s ur er i s e s ,i te xe r t sf or c ei t sf or c eont he me r c ur ywhi c hbe c ome sc ompr e s s e d. Theme r c ur yi spus he dupt hebul bt oahe i ghtof760mm. Whe npr e s s ur ede c r e a s e st heme r c ur yc ont r a c t sa ndmove sdo wn t het he r mome t e r . Adva nt a ge s I tgi ve sa c c ur a t er e a di ngs . I ti ss i mpl et oc ons t r uc ta ndma i nt a i n. Di s a dva nt a ge s I ti sve r yl a r gea ndc umbe r s ome . Me r c ur ymus tbea tl e a s tame t e rl ong. The ybr e a ke a s i l y. The yc a nnotpr oduc eac ont i nuousr e a di ng,s or e a di ngsha vet obe t a ke nr e gul a r l y. Me r c ur yi sada nge r ouspoi s on. Ane r oi dBa r ome t e r The s ea r epor t a bl ea ndc a nbes a f e l yus e da thome sa nds c hool sa s t he ydonotc on t a i nme r c ur y. The ya r ema deupofa na i r t i ghtme t a lbox. I fpr e s s ur ei nc r e a s e st heboxi ss qua s he di nwa r ds . Conve r s e l yi fpr e s s ur ede c r e a s e st h eboxe xpa ndsout wa r ds . Ac ompl e xs e r i e sofs pr i ngsi sa t t a c he dt ot hebox. Theot he re ndoft hes pr i ngi sc onne c t e dt oapoi ntwhi c hha sa c a l i br a t e ddi a lont heot he re ndt or e c or dt heva r i ouspr e s s ur e r e a di ngs . Thes pr i nga mpl i f i e st hee xpa ns i on sa ndc ont r a c t i onsoft heboxi n a c c or da nc et oa t mos phe r i cpr e s s ur e . Adva nt a ge s I ti spor t a bl e . I tc a nbes a f e l yus e di nt hehomeora ts c hools i nc ei tdoe snotr e l y onme r c ur ywhi c hi spoi s onous . I ti se a s i e rt or e a ds i nc ei tc ome swi t hac a l i br a t e ddi a l . Ca nma kec ont i nuousr e a di ngs . Ca nbea t t a c he dt oac omput e rt oma kea ut oma t e dc ont i nuous r e a di ngs . Di s a dva nt a ge s I ti sl e s sa c c ur a t e . Re qui r e sgr e a ts ki l la nde xpe r t i s et oma ke . ZI MSECOLe ve lGe ogr a phyNot e s :Wi nddi r e c t i ona nds pe e d. Wi ndi st hemove me ntofa i ra c r os st hee a r t h’ ss ur f a c eduet odi f f e r e nc e s i npr e s s ur ebe t we e nt wor e g i ons .Ai rmo ve sf r omhi ghpr e s s ur er e gi ons t ol owpr e s s ur er e gi ons .Thedi f f e r e nc e si npr e s s ur ec a nbec a us e dby di f f e r e nt i a lhe a t i ngo ft hee a r t h’ ss ur f a c eorbye a r t ha nds e abr e e z e s . Twoa s pe c t sofwi nda r eme a s ur e da twe a t he rs t a t i ons : 1.Wi nddi r e c t i on -t hi si sdoneus i ngawi ndwa ne t her e dt a i l e d i ns t r ume nti nt hepi c t ur ea ndt hei n f or ma t i oni spl ot t e dgi ve ni n t e r msoft hec a r di na lpoi nt sofac o mpa s s . 2.Wi nds pe e d-t hi si sdo neus i nga nc upa ne mome t e ra ndt hes pe e di s gi ve ni nknot sora si si nc r e a s i ngl ybe c omi ngt hec a s ei nkm/ hr . Poi nt sofac ompa s s Thef ourpoi nt sN, S, Ea ndW a r er e f e r r e dt oa st hec a r di na lpoi nt s . Thea ddi t i ona lf ourpoi nt sSW, SE, NEa ndNW a r er e f e r r e dt oa s t hei nt e r c a r di na loror di na lpoi nt s . Thea ddi t i ona lpoi nt se . g.SSW a r ec a l l e dt hes e c onda r yi nt e r c a r di na lpoi nt s . Wi nddi r e c t i oni st ypi c a l l ygi ve ni nus i nge i t he rt hec a r di na lpoi nt s ors ome t i me si nt e r msoft heor di n a lpoi nt s . Knot s Anot ei sas pe e de qua lt o1. 852Km/ hr . I tus e dt obet h emos tpopul a runi tt ome a s ur ea i rs pe e da nd ZI MSECe xa mi na t i onsa ndt e xt boo kss t i l lus ei t . I tha sl a r ge l ybe e ns upe r s e de di nmos tr e por t sbyt hemor ef a mi l i a r me t r i cuni tkm/ hr . ZI MSECOLe ve lGe ogr a phyNot e s :Cl ouds Re f e r st ot hef r a c t i onoft hes kyobs c ur e dbyc l oudswhe nobs e r ve df r om apa r t i c ul a rl oc a t i on.Okt ai st heus ua lun i tofme a s ur e me ntoft hec l oud c ove r .Skyc ondi t i onsa r ee s t i ma t e di nt e r msofhowma nye i ght hsoft he s kya r ec ove r e di nc l oud,r a ngi ngf r om0okt a s( c ompl e t e l yc l e a rs ky ) t hr ought o8okt a s( c ompl e t e l yove r c a s t ) . Cl oudc ove rs ymbol sa ndme a s ur e me nt s . Thedi a gr a ma boves howshowc l oudc ove rc a nbee s t i ma t e d.Ane y e obs e r ve rma ke st hene c e s s a r ye s t i ma t e sa tagi ve npoi ntofme a s ur e me nt . 3Dc a me r a sa ndc omput i ngs of t wa r ec a na l s obeus e dt oma kemor e a c c ur a t ee s t i ma t e sofc l oudc ove rnowa d a ys . Cl a s s i f i c a t i onofc l ouds . Cl oud sa r ec l a s s i f i e da c c or di ngt ohe i ghta ndf or mofa ppe a r a nc e .The r e a r ehi ghl e ve l ,mi ddl el e ve la ndl owl e ve lc l ouds .Va r i ousa dj e c t i ve sa r e us e dt ode not ehe i ghta ndf o r m( s ha pe ) . Hi ghLe ve lc l ouds Ci r r oi sl a t i nf orhi gh/ c r e s t . Thea dj e c t i ve sa r eus e dt ode s c r i behi ghl e ve lc l ouds . I ti sus e df orc l oudsf oundbe t we e n6000mt o12000m. Exa mpl e si nc l udec i r r us ,c i r r os t a t usa ndc i r r oc umul ousc l ouds . Mi ddl eLe ve lCl ouds . Al t ome a nsmi ddl e . The s er a ngebe t we e n2100ma nd6000m. Exa mpl e si nc l udea l t oc umul us ,a l t os t r a t usa nds t r a t oc umul ous . Lowl e ve lc l ouds Ni mbusme a nswa t e rbe a r i ng. The s ea r ebe l ow2100 m. Exa mpl e si nc l udec umul oni mbus ,c umul ous ,ni mbos t r a t usa nd s t r a t usc l ouds . NB.Somec l oudst r a ns ve r s ea l lhe i ght s .The s ea r er e f e r e dt oa sc l ou dsof gr e a t ve r t i c a le xt e ntf ore xa mpl ec umul oni mbusc l ouds . Adj e c t i ve sus e dt ode s c r i bef or m. Cumul usme a nshe a pe d. St r a t usme a nsl a ye r e d. Ci r r usme a nsc ur l y. Commont ype sofc l ouds . Common/ i mpor t a ntc l oudt ype s . Ci r r us . Ci r r usc l ouds . Wi s pywhi t ec l oudswi t haf e a t he r ya ndpa t c hyc ove r . Ha veas i l kys he e na ppe a r a nc e . Ar ec ompos e dofi c ec r ys t a l s . The yha r dl ybl oc ks un l i ght . The ygi vet hes unar e dorye l l owc ol ordur i ngs uns e ta nds unr i s e . Cumu l oni mbus Cumu l oni mbusc l ou ds The ya r eus ua l l ya nvi ls ha pe da tt het op. Ext e ndofgr e a tve r t i c a ldi s t a nc e . The ya r ebl a c korwhi t e ,he a pe d. Ar ea s s oc i a t e dwi t ht or r e nt i a lr a i nf a l la ndt hunde r s t or ms . Ni mbos t r a t usc l ouds Ni mbos t r a t usc l ouds The ya r eda r kgr e y. De ns e ,s ha pe l e s s . Ar ea s s oc i a t e dwi t hr a i n. Al t oc umul us Al t oc umul usc l ouds . Whi t eorgr e ya ndpa t c he d. Ar ema deupofl a mi na e( pl a t e s ) Whe nt hes unp a s s e sove rt he mt he yf or mac or ona . ZI MSECOLe ve lGe ogr a phyNot e s :Suns hi ne I tha sagl a s ss phe r es ur r ounde dbyame t a lf r a me . Ont hef r a mei sa t t a c he das e ns i t i vec a r d. Thes phe r ef oc us e st hes un’ sr a ysont ot hec a r d. Ast hes unmove sa c r os st hes kyi tbur nsat r a c eont hec a r d. Att hee ndoft heda yt hec a r di st a ke nouta ndt hel e ngt hi s me a s ur e di nhour sa ndmi nut e s . The r ea r edi gi t a lve r s i onst ha tc ont i nua l l yr e c or dt hea mountof s unl i ght . Suns hi nei si mpor t a ntf orva r i ousa c t i vi t i e sf ore xa mpl es ol a r dr yi ngofc r opsors ol a re ne r gyge n e r a t i on. Ai rma s s e s Ai rMa s s e s Ana i rma s si sal a r gebodyofa i r , whos epr ope r t i e s–t e mpe r a t ur e , humi di t y( a i rmoi s t ur e )a ndl a ps er a t e–a r el a r ge l yuni f or m( t h e s a me )ove ra na r e as e ve r a lhundr e dki l ome t e r sa c r os s . Ther e gi onswhe r ea i rma s s e sf or ma r er e f e r r e dt oa sa i rma s s s our c er e gi ons . Ana i rma s sa c qui r e si t sdi s t i nc t i vec ha r a c t e r i s t i c si nas our c e r e gi onwhe r et he r ei sal a r gea ndf a i r l yuni f or ms ur f a c e ,e i t he r wa t e rorl a nd,ove rwhi c ha i rr e ma i nsf a i r l ys t a gna ntf orape r i odof a tl e a s taf e wda ys . I fa i rr e ma i nso ve ras our c er e gi onl onge nough,i twi l la c qui r et he pr ope r t i e soft hes ur f a c ebe l owi t . Exa mpl e sofi de a ls our c er e gi onsf ora i rma s s e si nc l udeSi be r i a , Oc e a nsl i ket heI ndi a nOc e a na ndl a r gede s e r t sl i keSa ha r a . Thea i rs t a gna t e st of or mahi ghpr e s s ur es ys t e m( r e gi on) . Ai rma s s e sa r ec l a s s i f i e da c c or di ngt ot he i rt e mpe r a t ur ea nd moi s t ur ec ha r a c t e r i s t i c s . Thepr ope r t i e sofa na i rma s st ha ti ta c qui r e sf r omt hes our c e r e gi onde pe ndonanumbe roff a c t or sf ore xa mpl et het i meoft he ye a r( s umme r ,wi nt e r ,a ut umn) ,t hena t ur eoft heunde r l yi ng s ur f a c e( oc e a n,l a ndo rde s e r t ) ,a ndt hel e ngt hoft i met hea i rma s s r e ma i nsove ri t ss our c er e gi on. Ai rma s s e sa r egr oupe di nt of ourc a t e gor i e sba s e dont he i rs our c e r e gi on. Ai rma s s e st ha tor i gi n a t ei nt hec ol d,pol a rr e gi onsa r ede s i gna t e d wi t hac a pi t a l“ P”f orpol a r . Ai rma s s e st ha tor i gi n a t ei nt hewa r m,t r opi c a lr e gi onsa r e de s i gna t e dwi t hac a pi t a l“ T”f ort r opi c a l . Ai rma s s e st ha tor i gi n a t eove rl a ndwi l lbedr ya nda r ede s i gna t e d wi t hal owe r c a s e“ c ”f orc ont i ne nt a l . Ai rma s s e st ha tor i gi n a t eove rwa t e rwi l lbemoi s ta nda r e de s i gna t e dwi t hal owe r c a s e“ m”f o rma r i t i me The s el e t t e r sa r ec ombi ne dt oi ndi c a t et het ypeofa i rma s sf or e xa mpl eTr opi c a lMa r i t i me ,Tr opi c a lCont i ne nt a le t c . I nmovi nga wa yf r omt he i rs our c er e gi ons ,a i rma s s e swi l lbe modi f i e dbyt hes ur f a c eove rwhi c ht he ypa s sa ndt hust he i rl a t e r pr ope r t i e swi l lde pe ndnotonl yont he i rs our c er e gi onbuta l s oon t hena t ur eoft hes ur f a c et he ypa s sove ra ndt he i ra ges i nc ebe i ng f or me d. Thes out he r np ol ei sc ompl e t e l ys u r r ounde dbyt heAnt a r c t i ca nd t he r e f or et het wo( pol ea ndAnt a r c t i c )a r et r e a t e da soneor i gi n. Twoma j ora i rma s s e sr e a c hZi mba bwei . epol a rma r i t i mea nd t r opi c a lma r i t i me . Thet r opi c a lc o nt i ne nt a la i rma s si sr e s i de ntt oZi mba bwe . Type sofa i rma s s e s Af r i cai saf f ect edal mostexcl usi vel ybyt r opi calandequat or i alai r masses, wi t ht r opi calcont i nent al ( cT)ai rmassesdomi nanti nt he nor t her nt hi r doft hecont i nentandi not hersmal l erpat ches, t r opi calmar i t i me( mT)andequat or i al( E)ai rmassesmost i nf l uent i ali ncoast alandequat or i alAf r i ca 1)Tr opi c a lc ont i ne nt a l Or i gi na t eove rNor t hAf r i c aa ndt h eSa ha r ade s e r t . Cha r a c t e r i s t i c a l l yhota ndve r ydr y. Ve r yuns t a bl e ,ye tc l e a rc ondi t i onspr e domi na t eduet oal a c ko f wa t e rva por . 2.Tr opi c a lMa r i t i me For move rl owl a t i t udeoc e a nsa nda ss uc ha r eve r ywa r m,humi d, a nduns t a bl e . Thet r opi c a lma r i t i mea i rma s st ha tr e a c he sZi mba bwei st heNE t r a de sor i gi na t i ngf r omt henor t he r nhe mi s phe r es ubt r opi c a l a nt i c yc l oneus ua l l yc e nt e r e dove rc e nt r a lI ndi a noc e a n( ove rt he e qua t or ) . 3.Pol a rma r i t i me TheSEt r a de sor i gi na t i ngf r omt hes out he r nhe mi s phe r e s ubt r opi c a la nt i c yc l oni cc e l l sa ndwhos ef e t c hbe gi nsf r om Ant a r c t i c ,c ons t i t ut et hepol a rma r i t i mea i rma s s . TheSout hEa s t e r l yt r a dewi ndsa r eawi nt e rf e a t ur ei nZi mba b we . The ya r ec ool e ra ndmoi s t e rt ha nt h er e s i de ntt r opi c a lc ont i ne nt a l a i rdur i ngwi nt e r . Whe nt he ypr e va i love rt hec ount r ydur i ngt hes umme rs e a s on , t he ys t i l lr e ma i nc ool e rbuta r edr i e rt ha nt hel oc a la i r . Ai rma s s e sa f f e c t i ngZi mba bwe 1.Sout hEa s tTr a deWi nds a r ec oolmoi s tpr e va i l i ngwi ndswhi c hbl owt hr oughoutt heye a r . The ya r eus ua l l ya s s oc i a t e dwi t hc ont i nuousl i ghts howe r sa nd dr i z z l ee s pe c i a l l yonwi ndwa r ds l ope s . The yof t e ngi ver i s et ogut ic ondi t i onsi mme di a t e l ya f t e rt her a i ny s e a s on. Whe nt he ybl ows t r ongl yf r omt hes out he a s tt he yof t e ngi vec l e a r we a t he ri ns umme ra ndc l oudywe a t he ri nwi nt e r . 2.Za i r eAi r(Nor t hWe s tMons oons ) The s eonl ybl o wi ns u mme r . The ya r ea c t ua l l yt her e c ur ve dSo ut hEa s tt r a de swhi c hupon a ppr oa c hi ngAngol age tdr a wni nt oZi mba bwevi aDRCbyt he i nt e ns el owpr e s s ur eoft heI TCZ. The ybr i ngal otr a i nt oZi mba bwea ndCe nt r a lAf r i c aa st he y c ol l e c tmoi s t ur ef r ombott heAt l a nt i cOc e a na ndt heCongor a i n f or e s t . 3.Nor t hEa s tMons oons Onl ybl owi nt hes umme ra ndc a us er a i nt of a l li nt heNor t he r n pa r t sofZi mba bwee s pe c i a l l yi nl a t eDe c e mbe rt oe a r l yJ a nua r y. The ya r enota smoi s ta st heNor t hWe s tMons oons . ZI MSECOLe ve lGe ogr a phyNot e s :Pr e s s ur e Pr e s s ur e Ai rha swe i ghta ndt he r e f or ee xe r t spr e s s ur e ,c a l l e da t mos phe r i c pr e s s ur eont ot hee a r t h’ ss ur f a c e . Thepr e s s ur ei snott hes a mef ora l lr e gi onsnori si tt hes a mef or a nyoner e gi ona l lt het i met ha ti sp r e s s ur ei shi ghe rf oronepa r tof t heye a rt ha not he rt i me soft heye a r . At mos phe r i cpr e s s ur ei sa f f e c t e dby:a l t i t ude ,t e mpe r a t ur ea ndt he e a r t h’ sr ot a t i on. Al t i t ude Al t i t uder e f e r st ohe i g hta boves e al e ve l . Ai rpr e s s ur ei shi ghe ra ts e al e ve lt ha ni ti sa tt het opofamou nt a i n. Thi si sbe c a us ea ts e al e ve la i rha st os uppor tgr e a t e rwe i ghtofa i r t ha na i ra tt het opoft hemount a i n. Themol e c ul e sofa i ra ts e al e ve lpus hout wa r dswi t haf or c ee q ua l t ot ha te xe r t e dbyt hea i ra bovei twhe r e a sa i ra tt het opofa mount a i npus h e sout wa r dswi t hmuc hl e s sf or c ebe c a us et he we i ghtoft hea i rbovei ti sl e s s . Thi se xpl a i nswhya i rpr e s s ur ei nc r e a s e swhe na i rde s c e nds . Whe na i rde s c e ndsi t svol umede c r e a s e sbutt henumbe rof mol e c ul e sr e ma i nt hes a mei nnumbe rr e s ul t i ngi nmor emol e c ul e s oc c upyi ngas ma l l e rv ol ume . Conve r s e l ywhe na i rr i s e si t svol umei nc r e a s e sa ndi t sout wa r d f or c ei ss pr e a dove ral a r ge ra r e at h usi t spr e s s ur ede c r e a s e s . Te mpe r a t ur e Thet e mpe r a t u r eofa i rr i s e swhe ni t spr e s s ur er i s e s . Thet e mpe r a t u r eofa i rf a l l swhe ni t spr e s s ur ef a l l s . Thepr e s s ur eofa i rf a l l swhe ni t st e mpe r a t ur er i s e s . Thepr e s s ur eofa i rr i s e swhe ni t st e mpe r a t ur ef a l l s . I fonl yt e mpe r a t ur ea f f e c t e dpr e s s ur et he r ewoul dbeabe l tofl ow pr e s s ur ea r oundt hee a r t ha tt hee qu a t or ,t wobe l t sofhi ghpr e s s ur e oneove rbot ht heNor t ha ndSout hPol e s . Be c a us ea l lbe c a us ea l t i t udea ndt h ee a r t h’ sr ot a t i ona l s oa f f e c t pr e s s ur et her e s ul t i ngpa t t e r ni snota ss i mpl ea st hi s . Thei nf l ue nc eoft hee a r t h’ sr ot a t i ononp r e s s ur e . Ther ot a t i onoft hee a r t hc a us e st hea i ra tt hepol e st obe“ t hr own” a wa yt owa r dst hee qua t or . I nt he or yt hi swoul dr e s ul ti na i rpi l i nga tt hee qua t orc r e a t i nga r e gi onofHi ghpr e s s ur ea tt hee qua t or . Ther e a l i t yi smuc hmor ec ompl i c a t e da sot he rf a c t or sl i ke t e mpe r a t ur ea l s oa f f e c tpr e s s ur e . Pr e s s ur ebe l t s Lowt e mpe r a t ur e sa tt hepol e sc a us et hea i rt oc ont r a c ta ndhi g h pr e s s ur ede ve l opsa sar e s ul t . Hi ght e mpe r a t ur e sa l ongt hee qua t orc a us et hea i rt oe xpa nda nd l owpr e s s ur e ,c a l l e dt hedol dr uml owpr e s s ur e( t heI TCZ) , de ve l ops . Ai rbl owi nga wa yf r omt hepol e sc r os s e spa r a l l e l sa ndc r e a t e sl ow pr e s s ur ebe l t sa l ong60° Na nd60° S. Asa i rmove si nf r omt hepol e smor ea i rmove si nf r omhi ghe r l e ve l st ot a kei t spl a c e . Someoft hi sc ome sf r omt her i s i ngl owpr e s s ur ea i ra l ong60° S a nd60° N. Ai rr i s i nga tt hee qua t ors pr e a dsou ta ndmove st owa r dst hep ol e s . Asi tdoe ss oi tc r os s e spa r a l l e l st ha ta r ege t t i ngs hor t e ra ndha st o oc c upyl e s ss pa c er e s ul t i ngi na ni n c r e a s ei npr e s s ur ea si tc on t r a c t s . Thi sha ppe nsne a r30° Na nd30° Sa ndt hea i rbe gi nst os i nkwhe r e i tbui l dsups ubt r opi c a lhi ghpr e s s ur ebe l t sc a l l e dhor s el a t i t ude s . Someoft heHi ghpr e s s ur ea i ri nl a t i t ude s30° Na nd30° Smove s ove rt hes ur f a c et owa r dst hee qua t ora nds omeofi tt owa r dst h e pol e s . Thea i rt ha tmove st owa r dst hee qu a t orr e pl a c e st hea i rt ha tr i s e s t he r e . Thea i rmovi ngt owa r dst hepol e sr e a c he sl a t i t ude s60° Na nd60° S whe r ei tr e pl a c e st hea i rt ha tr i s e st he r e . Wi ndsbl owove rt hes ur f a c ebl owf r omhi ghpr e s s ur et ol ow pr e s s ur ea r e a s . Athi ghl e ve l sbl owf r oml owpr e s s ur es ys t e mst ohi ghpr e s s ur e s ys t e ms . I ne a c hhe mi s phe r et he r ea r et hr e epr e s s ur es ys t e ms :Pol a rHi gh Pr e s s ur e ,Te mpe r a t eLowpr e s s ur ea ndSubTr opi c a lHi ghpr e s s ur e a ndi nt hemi ds tofbot hpol e si st h eEqua t or i a lLowpr e s s ur e . Thi si sa l la s s umi ngt hee a r t h’ ss ur f a c ewa sf l a ta nduni f or mi . e .i f t hee a r t hwa sa ni s ot r opi cpl a ne . Se et hedi a gr a mbe l owf oras i mpl i f i e dvi e woft hee a r t h’ sma j or pr e s s ur ebe l t s . Ac t ua lpr e s s ur es ys t e ms Thee a r t h’ ss ur f a c e si snotuni f or m:t he r ea r ewa t e ra ndl a nd ma s s e sofdi f f e r e nts ha pe sa nds i z e s . Thee a r t h’ si sa l s ot i l t e da ta nof66. 5de gr e e sa ndt hee a r t ha nd l a ndma s s e sa r ehe a t e da ndc oola tdi f f e r e ntr a t e s . Pr e s s ur ebe l t sa ndwi nds Thee a r t h’ s( pl a ne t a r y)wi nds ys t e msa r ec a us e da ndc ont r ol l e dby t hema j orpr e s s ur ebe l t sout l i ne da b ove . Thepr e s s ur epa t t e r nsa ndwi ndsa r es howni nt het wodi a gr a ms be l ow. The s epa t t e r nsi npr e s s ur ea ndwi ndsc ha nges e a s ona l l ya c c or di ng t oc ha nge si nt e mpe r a t ur e . Duet ot her ot a t i onoft hee a r t hwi ndsa r ede f l e c t e dt ot her i ghti n t henor t he r nhe mi s phe r ea ndt ot hel e f ti nt hes out he r nhe mi s phe r e . Pl a ne t a r ywi ndsa r es ome t i me sknowna spr e va i l i ngwi ndsbe c a us e t he ybl owmor ef r e que nt l yt ha nmos twi nds . Wi ndsa r ena me da f t e rt hedi r e c t i onwhi c ht he ybl ow. The r ea r e3ma j orwi nds ys t e msi ne a c hhe mi s phe r e : I nt heNor t he r nHe mi s phe r e : 1.Nor t hEa s tPol a rwi nd s :bl owf r omt hepol a rhi ghpr e s s ur et owa r ds t het e mpe r a t ur el owpr e s s ur ei nl a t i t ude60° N( t e mpe r a t el ow) . 2.Sout hWe s tWi nds :bl owf r omt hes ubt r opi c a lhi ghpr e s s ur e r e gi onsi nl a t i t ude30° Nt owa r dst h et e mpe r a t el owpr e s s ur ez o ne . 3.Nor t hEa s tTr a deWi nds :bl owf r omt hes ubt r opi c a lhi ghpr e s s ur e t owa r dst hedol dr umsa l ongt hee qua t or . I nt heSout he r nHe mi s phe r e : 1.Sout hEa s tPol a rwi nds :bl owf r omt hepol a rhi ghpr e s s ur et owa r ds t hel owt e mpe r a t epr e s s ur er e gi onsi nl a t i t ude60° S. 2.Nor t hEa s tWi nds :bl owf r omt hes ubt r opi c a lhi ghpr e s s ur ei n l a t i t ude30° St o wa r dst het e mpe r a t el owpr e s s ur e . 3.Sout hEa s tTr a deWi nds :bl owf r omt hes ubt r opi c a lhi ghpr e s s ur e r e gi onst owa r dst hedol dr ums . Pr e s s ur ebe l t si ndi a gr a ms Pr e s s ur ebe l t sa nda s s oc i a t e dwi ndpa t t e r nsi fwi t hout ’ st hee a r t h’ s r ot a t i ona lde f l e c t i on. Thee a r t h’ spr e s s ur ebe l t sa nda s s oc i a t e dwi ndpa t t e r nswhe nt hee a r t h’ s r ot a t i ona lde f l e c t i oni st a ke ni nt oa c c ount . Condi t i ons Nove mbe rt oMa r c h Hi ght e mpe r a t ur e soc c urove rc e nt r a la nds out he r nAf r i c a . Thi sr e s ul t si nl owpr e s s ur ede ve l opi ngove rt hi spa r toft he c ont i ne nt . Att hes a met i met e mpe r a t ur e sa r el owe rove rt heSout hAt l a nt i c a ndI ndi a nOc e a nsa ndpr e s s ur eove rt he s eoc e a nsi sr e l a t i ve l yhi gh. Nor t hAf r i c ai smuc hc ool e rt ha nt her e s tofAf r i c aa ndhi gh pr e s s ur et he r e f or ede v e l ops . Wi ndsbl owoutf r omt het r opi c a lc ont i ne nt a lhi ghpr e s s ur ea r r ma s sove rnor t he r nAf r i c a . Someoft he s ewi ndsbl owt owa r dst hel owpr e s s ur ea r e at ot he s out h. Thewi ndsbl owf r omt henor t he a s tove rWe s tAf r i c a . Be c a us et he yor i gi na t ef r omt hede s e r tt hewi ndsa r edr ya nddus t y. The ya r ec a l l e dha r ma t t a nwi nds . The ya r epr e ve nt e df r omgoi ngf ur t he rs out hbywi ndsbl owi ng f or mt heSout hAt l a nt i cOc e a n. TheNor t hEa s tTr a deWi ndsa f f e c tt hee a s tc os tofAf r i c a,whi l e t heSout hEa s tt r a dewi ndsope r a t ea l ongt heSout hEa s tc oa s t . Bot hwi ndsma kef ort hel owpr e s s ur eove rCe nt r a lAf r i c a . Dur i ngt hi spe r i od,s out hwe s twi ndsbl owa c r os st hes out hwe s t t i poft hec ont i ne nt . Condi t i onsf r omMa yt oSe pt e mbe r . Hi ght e mpe r a t ur e sove rnor t he r nAf r i c agi ver i s et ot he de ve l opme ntofal owpr e s s ur es ys t e m. Hi ghpr e s s ur el i e sove rs out he r nAf r i c aa ndove rt heI ndi a nOc e a n t ot hee a s t . Wi ndsbl owf r omt het r opi c a lma r i t i mea i rma s sove rt heSout h At l a nt i cOc e a n,t owa r dst hec ont i n e nt a ll owpr e s s ur ea i rma s sove r t heSa ha r a . The s ewi ndss t a r ta sSout hEa s tt r a dewi ndsbuta st he ymove nor t hoft hee qua t ort he ya r edr a wna c r os st hec oa s tofWe s tAf r i c a t owa r dst heSa ha r al owpr e s s ur e . The ynowbl owf r omt hes out hwe s ta ndbe c omet hes out hwe s t mons oona lwi nds . The ya r ewa r ma ndmoi s t . Dur i ngt hi spe r i oda r e a sSout hoft heSa ha r aa r ewa r ma nddr y. ZI MSECOLe ve lGe ogr a phyNot e s :Ra i nf a l l . Ra i nf a l li sj us tonef or mofpr e c i pi t a t i on. Pr e c i pi t a t i onoc c ur swhe nwa r mmoi s ta i rr i s e sori sf or c e dt or i s e . Wa t e rva pori nt hea i rpa r c e lc ool sa ndc onde ns e st of or mc l ouds . Thi si sbe c a us et e mpe r a t ur ef a l l swi t hi nc r e a s ei na l t i t ude . Whe nc onde ns a t i onoc c ur si tpr oduc e smi nut edr opl e t sofl e s st ha n 0. 05mmi ndi a me t e r . Whe nt he s edr opl e t sj oi nt oge t he ra ndgr owt of a l loft he i rown we i ghti ti sc a l l e dr a i n. The r ea r eot he rf or msofpr e c i pi t a t i onbe s i de sr a i ns uc ha ss l e e t , ha i l ,de w,hoa rf r os t ,f oga ndr i mea nds now. Type sofr a i n The r ea r eva r i oust ype sofr a i nde pe di ngonhowt hea i rr i s e s /i s f or c e dt or i s et he s ea r e : Fr ont a l / Cyc l oni c Oc c ur sa l ongf r ont swhe na i re . gS. We s t e r nCa pei nSout hAf r i c a . Re l i e f / Or ogr a phi c Oc c ur swhe nwa r ma i ri sf or c e dt or i s ebymount a i ns . Conve c t i ona l Oc c ur swhe nt hea i ra dj a c e ntt oa ne xc e s s i ve l yhe a t e dgr oundr i s e s . Conve r ge nc e Oc c ur sa l ongt heI TCZ. Ot he rt ype sofpr e c i pi t a t i on 1.Sl e e t Ami xt ur eofs nowa ndr a i n. Us ua l l yf or me dbys nowme l t i nga si tf a l l s . 2.Ha i l As ol i df or mofpr e c i pi t a t i on. I tc ons i s t sofba l l sofi r r e gul a rl umpsofi c ef a l l i ngf r omt hes k y e a c hofwhi c hi sc a l l e daha i l s t one . Whe nl a r gec hunksofi c ef a l l i ngf r omt hes kyi ti sr e f e r r e dt oa sa ha i l s t or m. 3.De w De wi st hes ma l ldr opl e t sofwa t e rt ha ta ppe a ronobj e c t ss uc ha s l e a ve sorgr a s si nt hemor ni ngore ve ni ngduet opr oc e s s e sof c onde ns a t i on. De wf or mswh e nt het e mpe r a t ur eofas ur f a c ec ool sdownt oa t e mpe r a t ur et h a ti sc ool e rt ha nt hede wpoi ntoft hea i rne xtt oi t . Thet e mpe r a t u r ea twhi c hdr opl e t sf or mi sc a l l e dt hede wpoi nt . 4.Hoa rFr os t Fr os ti st hec oa t i ngorde pos i tofi c et ha tma yf or mi nhumi da i ri n c ol dc ondi t i ons ,us ua l l yove r ni ght . I sc ommoni npl a c e sl i keNya nga , Ma r onde r aa nds omepa r t so f Ha r a r ei nwi nt e r . 5.Fog/ Mi s t I ti savi s i bl ema s sc ons i s t i ngofc l oudwa t e rdr opl e t sori c ec r ys t a l s s us pe nde di nt hea i ra torne a rt heEa r t h’ ss ur f a c e . Fogc a nbec ons i de r e dat ypeofl owl yi ngc l oud,a ndi she a vi l y i nf l ue nc e dbyne a r bybodi e sofwa t e r ,t opogr a phy,wi ndc ondi t i ons , a nde ve nhuma na c t i vi t i e s . Fogr e duc e svi s i bi l i t yt ol e s st ha n1kmwhi l ei nami s tvi s i bi l i t yi s r e duc e dt obe t we e n1a nd2km. 6.Ri me i sawhi t ei c et ha tf or mswhe nt hewa t e rdr opl e t si nf ogf r e e z et o t heout e rs ur f a c e sofobj e c t s . Of t e ns e e nont r e e s . 7.Snow i spr e c i pi t a t i oni nt hef or moff l a ke sofi c epa r t i c l e st ha tf a l lf r om t hec l ouds . Snowdoe snotoc c uri nZi mba bwea l t houghi ti sc ommoni n c ount r i e sl i ket heUKdur i ngwi nt e r . 8.Dr i z z l e Ve r yf i ner a i n. Us ua l l yf a l l sf r oml a ye r sofc l oudt ha tha veve r yl i mi t e dve r t i c a l de ve l opme nte . gs t r a t usc l ouds . ZI MSECOLe ve lGe ogr a phyNot e s :Re l i e fr a i nf a l l Re s ul t swhe nne a rs a t ur a t e d,wa r mma r i t i mea i ri sf or c e dt or i s eby ac oa s t a lmount a i nba r r i e r . Mount a i nsr e duc et hewa t e rhol di ngc a pa c i t yoft her i s i nga i rb y e nf or c e dc ool i ng. I nZi mba bwei tmos t l yoc c ur si nt heEa s t e r nHi ghl a ndsi na r e a s l i keChi ma ni ma ni ,Ho ndeVa l l e ya ndNya nga . Wa r mSout hEa s tTr a de spi c kupmoi s tf r omt heI ndi a nOc e a n. The ye nc ount e raba r r i e rmount a i nt ha ti spa r a l l e lt ot hec oa s t l i ne f ore xa mpl eMtI nya nga nia ndt heChi ma ni ma niMount a i ns . TheSETr a de sa r ef or c e dt or i s ebyt hemount a i n,c oola nd c onde ns ea ndr a i noc c ur sont heSout hEa s t e r ns l ope sort he wi ndwa r ds l ope soft hemount a i n. Ont hel e e wa r ds i deoft hemount a i ni ti sdr y. Thede s c e ndi ngSEt r a de sa r edr ya ndwa r mr e s ul t i ngi nl i t t l et ono r a i nf a l l . Thel e e wa r ds i dei ss ome t i me sknowna sar a i ns ha dowa r e a . Exa mpl e si nc l udeSa veva l l e ya ndMa r a ngea r e a . Re l i e fr a i nf a l loc c ur si na l la l t i t ude s Mos toft her a i noc c ur sont heEa s ts i deoft hes l ope .