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Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe...
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Transcript of Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe...
![Page 1: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/1.jpg)
Modellierung von Sedimenttransporten im Wattenmeer
- Gerold Brink-Spalink -
Forschergruppe BioGeoChemie des Watts TP 4
Gerold Brink-Spalink Jörg-Olaf Wolff Emil Stanev
BioGeoChemistry of Tidal Flats (SP 4)
Modelling Mud and Sand Transport in the East-Frisian Wadden Sea
![Page 2: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/2.jpg)
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
![Page 3: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/3.jpg)
Study Area: Spiekeroog Island
Spiekeroog
Otzumer Balje
![Page 4: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/4.jpg)
Model Area: East Frisian Wadden Sea
7 Basins
Volume High Water: 184 Mio m³
Volume Low Water: 39 Mio m³
Area: 71 Mio m²
Inlet width: 2500 m
Inlet area: 11000 m²
Spiekeroog Basin:(spring tide)
Maximum channel depth: 12 m
![Page 5: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/5.jpg)
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
![Page 6: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/6.jpg)
uA
z
uA
zxg
z
uwfv
y
uv
x
u
t
uHV
22
vA
z
vA
zyg
z
vwfu
y
v
x
uv
t
vHV
22
Hydrodynamic Model (GETM)
0
z
w
y
v
x
u
Momentum equations:
Vertical mixing:
1tVA
,2
4
kct
k and from k--turbulence-model
,,1minmin
min
DD
DD
crit
Drying:
critDD for 1
critminfor 10 DDD
minfor 0 DD
![Page 7: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/7.jpg)
•3D-model
•horizontal resolution: 200 m
•vertical resolution: D/10 (D=water depth)
•vertical grid: -coordinates
•Time discretization: mode splitting
• t1=3s for sea level, vert. integr. Velocities
• t2=15s for 3D-fields: turbulent variables, ...)
Hydrodynamic Model
![Page 8: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/8.jpg)
Sediment Transport Model
erosiondeposition
settlingdiffusionadvection
EDcvzz
cA
zz
cw
y
cv
x
cu
t
csV
Deposition: d
dsb vcD
0
0 1
Erosion:e
eeME
0
0 1
Settling velocity:2
0
0
18d
gvs
sm
ss ckv or
(Sand) (Mud)
![Page 9: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/9.jpg)
• Sediment on ground (Sand: 100µm, Mud) unlimited• Morphologic changes during model run are not
considered in topography data• Water flowing into model area carries no sediment• Sediment flowing out of model area is „lost“ • Sediment model is initialized half a tide after
hydrodynamic model
Forcing on northern boundary:
Boundary conditions:
![Page 10: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/10.jpg)
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
![Page 11: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/11.jpg)
Mean bottom shear velocity
Maximum bottom shear velocity
Duration of erosion of mud (top) and sand (bottom) during one spring tide cycle in percent:
u*=1,4 cm/s
u*=2,0 cm/s
Hydrodynamic conditions for erosion
![Page 12: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/12.jpg)
flood
high water
ebb
low water
Integrated suspended sediment concentration
![Page 13: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/13.jpg)
![Page 14: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/14.jpg)
![Page 15: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/15.jpg)
Sediment movements after 3 tidal cycles
![Page 16: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/16.jpg)
Model estimate of sediment types:
Measurement of sand content in sediment:
250-125 µm 125-63 µm
![Page 17: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/17.jpg)
Time evolution of vertical concentration profiles
![Page 18: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/18.jpg)
Vertical average of concentration: Transport through inlet:
![Page 19: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/19.jpg)
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
Overview:
1. Model Area: East Frisian Wadden Sea
2. Sediment Transport Model
3. Model Results
4. Conclusions
![Page 20: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/20.jpg)
• A 3D-model for sediment transport has been set up, that accounts for the main processes (erosion, settling, deposition, advection, turbulent mixing)
• Suspended sediment concentration patterns show consistent behaviour with observations
• Spatial distribution of sediment types matches observations in large areas
• Further calibration with measurements necessary
• Waves need to be taken into account
Conclusions:
![Page 21: Modellierung von Sedimenttransporten im Wattenmeer - Gerold Brink-Spalink - Forschergruppe BioGeoChemie des Watts TP 4 Gerold Brink-Spalink Jörg-Olaf Wolff.](https://reader036.fdocuments.net/reader036/viewer/2022062304/56649f395503460f94c56354/html5/thumbnails/21.jpg)