Long-term change of SPM
¿. i
a
í
■
in the Scheldt
r>
department
M o b i li t y a n d
W. V a n d e n b ru w a e n e , K. l/Vildem eersch, J. v a ille
1
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f P I I
iM IIM B H
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S ch eld t-E m s w o rk e d
V la a m s e o verheid
fla n d e rs
&
fla n d e r s ® ^
HYDRAUL CS RESEARCH
department
_ _
.
M o b i li t y a n d
The project
putnc works
Mud balance Sea Scheldt
I
Historical evolution of SPM in the Sea Scheldt
Is there an increase in
SPM in the long-term?
What’s the effect of mud
disposal on SPM values?
r>
&
fla n d e r s ® ^
HYDRAUL CS RESEARCH
department
Long-term SPM: Data
M o b i li t y a n d
Public Works
DONAR
CEME
( 1971-2012)
(1989-2004)
SPM database
* Surface SPM *
* Tide-independent *
OMES
(1976-2012)
flanders
HYDRAUL CS RESEARCH
L
.
department
M o b i li t y a n d
Public Works
Long-term SPM: Data
Vlissingen
SPM database
* Surface SPM *
* Tide-independent*
ntwerpen
O
Te m se
DONAR + OM ES + CEME
15 mTAW
-15 mTAW
Gent
10 Km
flanders
HYDRAUL CS RESEARCH
department
Long-term SPM: Methods
M o b i li t y a n d
Public Works
Attribute relevant parameters to SPM sampling time
1) Time difference with nearest extrema
2) Spring, mean or neap tide
3) Season
4) Distance to mouth
5) .....
&
fla n d e rs ® ^
HYDRAUL CS RESEARCH
department
Long-term SPM: Methods
Public Works
Split surface SPM database by:
Spatial entities (10 km)
Time entities (10 year)
Spring-mean-neap tide
Time from HW/LW
Season (Spring-Summer-Autumn-Winter)
Calculate for clusters summarizing SPM statistics: median,
Q25, Q75, mean, etc.
flanders
HYDRAUL CS RESEARCH
department
m
A
-
M o b i li t y a n d
Long-term SPM: Results
250-
1971-1980
1981-1990
1991-2000
SPM [mg/l]
2001-2012
200
-
150
-
100
-
n=137
n=165
n=395
50-
n=31
n=12
n=78
o
20
40
60
80
100
Distance to Vlissingen [km]
120
140
160
Long term SPM: Results
Neap tide
Mean tide
250-
250
1971-1980
1981-1990
1991-2000
2001-2012
200
200-
SPM [mg/l]
1971-1980
1981-1990
1991-2000
2001-2012
150-
100-
O)
E
150
o.
100
<f )
50-
0-
~i—
20
40
60
80
100
120
140
0
160
20
Distance to Vlissingen [km]
40
60
250-
1971-1980
1981-1990
1991-2000
2001-2012
200-
150-
g;
loo H
100
120
Distance to Vlissingen [km]
Spring tide
O)
E
80
50-
0 -
20
40
60
80
100
120
Distance to Vlissingen [km]
140
160
140
160
Long term SPM: Results
LW+2h to LW+4h
250 -
200
1971-1980
1981-1990
1991-2000
2001-2012
Flood phase
-
150 -
100
-
50-
HW+2h to HW+4h
0
20
40
60
80
100
120
140
1971-1980
1981-1990
1991-2000
2001-2012
Ebb phase
Distance to Vlissingen [km]
200-
O)
E
150 -
S
o.
co
100
-
50-
0
20
40
60
80
100
120
Distance to Vlissingen [km]
140
160
flanders
HYDRAUL CS RESEARCH
department
u
*
_
Ä
.
Long-term SPM: Conclusions
•
M o b i li t y a n d
putucworks
Increase in surface SPM between 1980’s and 1990’s in
the lower Sea Scheldt (60-100 km from mouth)
• ETM occurs at 100-120 km from mouth (last 2 decades)
• ETM occurs at mean and spring tide, no distinct ETM at
neap tide
• 2 distinct ETM’s during flood in the last decade (70 km
from mouth and 100-120 km from mouth)
&
fla n d e rs ® ^
HYDRAUL CS RESEARCH
department
_ _
.
M o b i li t y a n d
The project
pubuc works
Mud balance Sea Scheldt
I
Historical evolution of SPM in the Sea Scheldt
Is there an increase in
SPM in the long-term?
r>
flanders
HYDRAUL CS RESEARCH
department
M o b i li t y a n d
Public Works
Mud disposal and SPM
Continuous SPM
(2008-2012)
Mud disposal
flanders
HYDRAUL CS RESEARCH
department
Mud disposal and SPM
Public Works
PunmSaA
Oosterweel
rm ke )
^•Antwerpen
Oosterwej
A
SPM continu
□
SlibStort 2008_2012
_
15 mTAW
-15 mTAW
5 Km
J
^Temse
legoten
flanders
HYDRAUL CS RESEARCH
department
M o b i li t y a n d
Public Works
Mud disposal and SPM
14
12
CO
0
0)
m
Total dum p quantity per year
X 10
I Schaar Ouden Doei
I Punt van Melsele
] Oosterweel
] Plaat van Boomke
I boei 102
10
1
ti
E8
f,
CT
"O
0
Cl
I 4
O
2008
2009
2010
Year
2011
2012
flanders
HYDRAUL CS RESEARCH
department
Mud disposal and SPM
Public Works
Punm SaA
Oosterweel
rm ke )
^•Antwerpen
Oosterwej
A
SPM continu
□
SlibStort 2008_2012
_
15 mTAW
-15 mTAW
5 Km
J
^Temse
legoten
flanders
HYDRAUL CS RESEARCH
department
Mud disposal and SPM
M o b i li t y a n d
Public Works
S P M at O oste rw e e l + nearby d isposal
X 10
800
SPM shallow
— SPM deep
o
Nearby disposal
600
400
200
as>
Jan09
Jan10
Tim e
&
fla n d e rs ® ^
HYDRAUL CS RESEARCH
department
mm
u
■-
■
■
Mud disposal and SPM
•
M o b i li t y a n d
pubucmna
We observe a correlation between mud disposal and
SPM signal
• Quantification of this correlation
• What is the effect of mud disposal in time and space?
r>
&
fla n d e rs ® ^
HYDRAUL CS RESEARCH
department
M o b i li t y a n d
Public Works
QUESTIONS?