Middle and lower course of the river

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“Hurricane force winds batter the UK. “ (bbc, 12 feb)
Why is this not a hurricane though?
HW
 Bring in a news paper article on the causes of the
flooding in Somerset
 Find out 10 impacts of flooding in Somerset (Figures
and place names)
 Due in on monday
Middle and lower course of the river
By the end of the lesson you will;
1) Be able to describe the key changes that occur as you move
down the river from source to mouth
2) Be able to explain how a range of features have been formed in
the middle and lower course of the river
3) Have applied your new knowledge on an exam question
Changes in the river;
Task
1.
Describe the main changes that occur as you move from the source to the mouth of
the river
2.
Add in as many key words as possible
Key words
Gradient
Velocity
Width
Deposition
Erosion
Transportation
Middle and lower course of the river
By the end of the lesson you will;
1) Be able to describe the key changes that occur as you move
down the river from source to mouth
2) Be able to explain how a range of features have been formed in
the middle and lower course of the river
3) Have applied your new knowledge on an exam question
Different features;
Task
Key features
You are going to have one feature in the middle and lower
course
Meander
Oxbow lake
Delta
Levee
You need to make notes as to how this feature is formed
You should;
1)
Explain how the feature is formed?
2)
Describe the key erosional methods occurring
3)
Add in a diagram
4)
Explain how the feature will change in the future
Oxbow lake;
An Oxbow lake is found in the middle and
Lower course of the river.
It is a depositional feature
Use the information to explain how it has
been formed
Gradually over time, On the bend of the
erosion will make the river, the water will
neck of the meander flow the fastest
come closer and
closer
An oxbow lake will
This will lead to the
happen on a meander formation of a river
in the middle course
beach
of a rive
On the inside of the
bend, the water will
flow the slowest
This will lead to the
formation of a river
cliff
During a period of
high energy, the river
will take the shortest
route, which is
straight across the
neck of the bend
Over time, there will
be deposition, which
will fill in the bend. It
will become
completely detached
from the river
Over time, the water
will be evaporated
away from the ox bow
lake and it will be dry.
This will cut the bend
off, and the river will
now flow in a straight
line
A* Detail;
An example of a delta is the
Mekong Delta in Vietnam
Lower course; Delta
Some of these methods include
traction, saltation and
suspension
The river will also reach the
mouth where it meets the sea
Over time, these will develop
into little islands which emerge
out of the water
This leads to any material being
deposited in the river channel
The river will loose the energy to
transport the sediment
This will lead to material being
deposited in the river channel
When the river reaches the
lower course, the gradient is
much smaller and the ground is
almost flat
This will mean that the water is
not moving
They will be held down by
vegetation, which will prevent
them from being eroded
Lower course; Levees
Upper / Middle/ Lower?
 Match up the following key features to the
section of the river which they occur in.
Upper
Middle
Lower
Lower course;
 Study the following picture
 Describe the changes in the landscape you can see
Pupils should be able to
describe relief and
landscape from a map using
terms such as ridge,
plateau, scarp, floodplain)
and adjectives such as
broad, flat, steep, deeply
cut, gently sloping) -
Middle and lower course of the river
By the end of the lesson you will;
1) Be able to describe the key changes that occur as you move
down the river from source to mouth
2) Be able to explain how a range of features have been formed in
the middle and lower course of the river
3) Have applied your new knowledge on an exam question
What have you learnt?
1. Describe the processes leading to the formation of a waterfall (5
marks)
Criteria
Erosional processes included
Key features included (cap rock, plunge pool, Gorge)
Examples of different rock type are included
Spelling and grammar is effective (less than 3 mistakes)
Achieved
Middle and lower course of the river
By the end of the lesson you will;
1) Be able to describe the key changes that occur as you move
down the river from source to mouth
2) Be able to explain how a range of features have been formed in
the middle and lower course of the river
3) Have applied your new knowledge on an exam question
What have you learnt?