flood plain hydraulic model case study: poyo creek eranet-crue
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Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Efficiency of non-structural flood mitigation measures:
“room for the river” and “retaining water in the landscape”
Flood Plain Hydraulic ModelCase Study: Poyo Creek
By:
Enrique Ortiz - HidroGaia, S.L. Water and Environment Technology
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Our contribution to this project
WP1: Generating scenarios WP2: Basin Hydrology
WP3: Flood prone areaanalysis
WP4: Flood impact andnon-structuralmeasures evaluation
T1.1. Land -uses
T1.2. Flood retention
T1.3. Hydrological inputs
T2.1. Model parametersestimation
T2.2. Simulations
T2.3. Statistical analysis
T3.1. DEM and hydrauliccharacteristics
estimation
T3.2. Hydraulicsimulations
T3.3. Hazard mapping
T4.1. Vulnerability
T4.2. Flood impact
T4.3. Non-structuralmeasures evaluation
WP3: Flood pronearea analysis
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
WP3: Flood prone area analysis
• DEM and hydraulic characteristics estimation– Sensitivity to DEM resolution
• Hydraulic simulations with appropiate model:– SOBEK-Rural (WL| Delft Hydraulics) 1D/2D– Interpolation of previous simulations
• Flood hazard mapping
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Hydraulic modelling area
188 Km2
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
• Sources– Aerial Photogrammetry
• Two Fligths• Scale of restitution 1:2,000
– DEM 10 meter resolution• Merging sources
– Coupling three sources
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Two Sources of aerial Photogrammetry
Final Product: Two DEM 5 meter resolution
DEM lake Albufera
DEM flood plain
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European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Intersection area and elevation differences of two DEMs
± 10 cm
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Merging two DEMs
5 m resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Two missing areasof altimetric data
But there is RegionalDEM with 10 meter resolution property
of regional Government
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European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
First task is resample our DEM of5 meter resolution to 10 meter resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Second task is merge resample DEM with Regional DEM
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Add buildings to the DEM with 10 meter resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Final DEM with 10 meter resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Digital Elevation Model
Final DEM with 10 meter resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Scale Analysis of Digital Elevation Model
We would like to study different scales for flood plain hydraulicModel (Unidimensional topology is obtained from the best Carthography resolution, 5 X 5 meters in all cases)
We choose five scales:
• 5 meters DEM resolution• 10 meters DEM resolution• 20 meters DEM resolution• 30 meters DEM resolution• 50 meters DEM resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Scale Analysis of Digital Elevation Model
5 meter DEM resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Scale Analysis of Digital Elevation Model
10 meter DEM resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Scale Analysis of Digital Elevation Model
20 meter DEM resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Scale Analysis of Digital Elevation Model
30 meter DEM resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Scale Analysis of Digital Elevation Model
50 meter DEM resolution
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
SOBEK RURAL WL|Delft Hydraulics
• SOBEK is a powerful 1D and 2D instrument for flood forecasting, drainage systems, irrigation systems, sewer overflow , ground-waterlevel control, river morphology, salt intrusion and water quality.
• The system is designed to deal with any kind of flows, sub- orsupercritical including hydraulic jumps or floodwave bores.
• The computational domain is splitted into a one-dimensional network, with general volumes of arbitrary shapes, and a two-dimensional part with rectangular computational cells.
• The equations to be solved are based upon the momentum balance and the conservation of mass. Saint Venant equations.
0y
)vh(x
)uh(t
=∂
∂+
∂∂
+∂ζ∂
02 =++∂∂
+∂∂
+∂∂
+∂∂
vavhC
Vvg
yg
yv
vxv
utv ζ
02 =++∂∂
+∂∂
+∂∂
+∂∂
uauhC
Vug
xg
yu
vxu
utu ζ
ConservationMomentum
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Implicit coupling of 1D and 2D schematisations can be based uponthe concept that both are to be defined on separate computational
layers, similar to the concept of the storage of spatial data ondifferent layers in a GIS.The 2D layer describes, on the basis of a
rectangular computational grid, flow over DTM-defined topographiesadjusted for objects blocking flow in floodplains, such as dikes andnatural levees. All sub-grid conveyance objects, such as channels,
including remnants of dead river branches and similar local depressions, and all kinds of hydraulic structures are described on
the 1D schematisation layer. Subsequently,1D and 2D schematisations will be linked to each other via water level
compatibility at selected computational nodes
SOBEK RURAL WL|Delft Hydraulics
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Both computational layers havefinite difference formulations forvolume and momentum balance equations, based uponastaggered grid approach.Thewater level compatibility betweenboth layers is obtained by addingfluxes from the1D and2Dschematisations throughsubstitution into a sharedcontinuity equation at the commongrid points where water levels are defined. Referring to Frank et al. (2001),the shared continuityequation is formulated as follows:
( ) ( )( ) ( )( ) ( )∑=
=−− =+−∆+−∆+
jiLji
ki
Kl
Kllnjijijiji
ji Qvhvhxuhuhydt
dV,
,
1,
0)()(
1,,,1,, ς
SOBEK RURAL WL|Delft Hydraulics
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
SOBEK 1D/2D
1. Cartography/orthophoto
2. Digital Elevation Model
3. 1D River Network
4. Overland Flood Simulation
5. Results
MassanasaPaiporta
Pis
ta d
e S
illa
Catarroja
SUPERFICIE MAX. AGUA
MARGEN Y FONDO
MassanasaPaiporta
Pis
ta d
e S
illa
Catarroja
SUPERFICIE MAX. AGUA
MARGEN Y FONDO
SOBEK RURAL WL|Delft Hydraulics
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
1D Computational Domain
383 Cross SectionsObtained from TIN
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
2D Computational Domain
493272 Cells
30 x 30 meter
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
1D/2D Computational Domain
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Roughness spatially distributed
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European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Boundary Conditions
1
2
3
4
11
22
33
44
1
2
3
4
11
22
33
44
436885071765094.364 Horteta Creek
4372350710850190.133 Poyo Creek at motorway A7
437155071075059.682 Gallego Creek at motorway A7
437405071155033.261 Pozalet Creek at motorway A7
UTM-YUTM-XBasin Area(km²)Hydrograh (TETIS Model)
Upstream
Downstream
Water Level in Albufera Lake
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Preliminary Results
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Preliminary Results
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Preliminary Results
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Preliminary Results
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Preliminary Results
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Preliminary Results (Flood Hazard Mapping)
Integrate, Consolidateand Disseminate
European Flood RiskManagement Research
ERA-NET CRUE Funding Initiative Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "
Preliminary Results
Examples the hydraulic simulations with SOBEK
• Complete Model 1D/2D 30 meters DEM resolution• Little area into complete Model 2D 5 meters DEM resolution
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