Flood Plain Hydraulic Model Case Study: Poyo Creek ERANET-CRUE

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Efficiency of non-structural flood mitigation measures: “room for the river” and “retaining water in the landscape” Flood Plain Hydraulic Model Case Study: Poyo Creek By: Enrique Ortiz - HidroGaia, S.L. Water and Environment Technology

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Our contribution to this project WP1: Generating scenarios

WP2: Basin Hydrology

T1.1. Land -uses T2.1. Model parameters estimation T1.2. Flood retention T2.2. Simulations

WP3: Flood prone area analysis

T1.3. Hydrological inputs T2.3. Statistical analysis

WP3: Flood prone area analysis T3.1. DEM and hydraulic characteristics estimation

T3.2. Hydraulic simulations

T3.3. Hazard mapping

ERA-NET CRUE Funding Initiative

WP4: Flood impact and non-structural measures evaluation T4.1. Vulnerability

T4.2. Flood impact

T4.3. Non-structural measures evaluation

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

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

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Hydraulic modelling area

188 Km2

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model • Sources – Aerial Photogrammetry • Two Fligths • Scale of restitution 1:2,000

– DEM 10 meter resolution • Merging sources – Coupling three sources

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model

DEM lake Albufera Two Sources of aerial Photogrammetry Final Product: Two DEM 5 meter resolution DEM flood plain ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model Intersection area and elevation differences of two DEMs

Âą 10 cm

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model Merging two DEMs

5 m resolution ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model

Two missing areas of altimetric data But there is Regional DEM with 10 meter resolution property of regional Government

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model First task is resample our DEM of 5 meter resolution to 10 meter resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model Second task is merge resample DEM with Regional DEM

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model Add buildings to the DEM with 10 meter resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model Final DEM with 10 meter resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Digital Elevation Model Final DEM with 10 meter resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Scale Analysis of Digital Elevation Model We would like to study different scales for flood plain hydraulic Model (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

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Scale Analysis of Digital Elevation Model 5 meter DEM resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Scale Analysis of Digital Elevation Model 10 meter DEM resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Scale Analysis of Digital Elevation Model 20 meter DEM resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Scale Analysis of Digital Elevation Model 30 meter DEM resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Scale Analysis of Digital Elevation Model 50 meter DEM resolution

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

SOBEK RURAL WL|Delft Hydraulics • SOBEK is a powerful 1D and 2D instrument for flood forecasting, drainage systems, irrigation systems, sewer overflow , ground-water level control, river morphology, salt intrusion and water quality.

• The system is designed to deal with any kind of flows, sub- or supercritical including hydraulic jumps or floodwave bores.

• The computational domain is splitted into a one-dimensional network, with general volumes of arbitrary shapes, and a twodimensional part with rectangular computational cells.

• The equations to be solved are based upon the momentum balance and the conservation of mass. Saint Venant equations.

Conservation ∂ ζ ∂ ( uh ) ∂ ( vh ) + + =0 ∂t ∂x ∂y

Momentum uV ∂u ∂u ∂u ∂ζ + u + v + g + g + au u = 0 ∂t ∂x ∂y ∂x C 2h vV ∂v ∂v ∂v ∂ζ + u + v + g + g + av v = 0 ∂t ∂x ∂y ∂y C 2h

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

SOBEK RURAL WL|Delft Hydraulics Implicit coupling of 1D and 2D schematisations can be based upon the concept that both are to be defined on separate computational layers, similar to the concept of the storage of spatial data on different layers in a GIS.The 2D layer describes, on the basis of a rectangular computational grid, flow over DTM-defined topographies adjusted for objects blocking flow in floodplains, such as dikes and natural 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

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

SOBEK RURAL WL|Delft Hydraulics Both computational layers have finite difference formulations for volume and momentum balance equations, based upon astaggered grid approach.The water level compatibility between both layers is obtained by adding fluxes from the1D and 2Dschematisations through substitution into a shared continuity equation at the common grid points where water levels are l =K dVi , j (ς ) defined. Referring to Frank et al. + ∆y ((uh)i , j − (uh)i −1, j ) + ∆x ((vh)i , j − (vh)i , j −1 ) + ∑ (Qn )l = 0 dt l=K (2001),the shared continuity equation is formulated as follows: Li , j i, j

1 i ,k

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Paiporta Massanasa

Pista de S illa

SOBEK RURAL WL|Delft Hydraulics SOBEK 1D/2D

Catarroja

SUPERFICIE MAX. AGUA MARGEN Y FONDO

5. Results 4. Overland Flood Simulation 3. 1D River Network 2. Digital Elevation Model 1. Cartography/orthophoto ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

1D Computational Domain 383 Cross Sections Obtained from TIN

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

2D Computational Domain

493272 Cells 30 x 30 meter

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

1D/2D Computational Domain

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Roughness spatially distributed

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Boundary Conditions Upstream

1 1

Basin Area (km²)

UTM-X

UTM-Y

1 Pozalet Creek at motorway A7

33.26

711550

4374050

2 Gallego Creek at motorway A7

59.68

710750

4371550

190.13

710850

4372350

94.36

717650

4368850

Hydrograh (TETIS Model)

3 Poyo Creek at motorway A7 4 Horteta Creek

2 2 3 3

4 4

Downstream Water Level in Albufera Lake

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Preliminary Results

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Preliminary Results

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Preliminary Results

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Preliminary Results

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Preliminary Results

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

Preliminary Results (Flood Hazard Mapping)

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "

Integrate, Consolidate and Disseminate European Flood Risk Management Research

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

ERA-NET CRUE Funding Initiative

Efficiency of non-structural flood mitigation measures: "room for the river" and "retaining water in the landscape "