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DSD-INT 2018 Flood modeling in rural areas due to extreme precipitation or levee breaches - Verhoeven

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Presentation by Govert Verhoeven (Deltares) at the Delft3D - User Days (Day 1: Hydrology and hydrodynamics), during Delft Software Days - Edition 2018. Monday, 12 November 2018, Delft.

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DSD-INT 2018 Flood modeling in rural areas due to extreme precipitation or levee breaches - Verhoeven

  1. 1. Delft Software Days - Edition 2018 Flood modeling in rural areas due to extreme precipitation or levee breaches Towards an integrated approach using Delft3D FM Govert Verhoeven, Deltares
  2. 2. Recent Floods due to extreme rainfall 29 november 2018
  3. 3. Rainstorm in Delft Deltares Delft, Thursday 31st of May
  4. 4. Flooding due to heavy rainstorm 31st of May
  5. 5. Flooding due to heavy rainstorm 31st of May Office is 1 year old
  6. 6. Back home Newly build sewer system in 2015
  7. 7. Stress test Climate proof stress test for municipalities
  8. 8. Waterboard Rivierenland using Delft3D FM Delft3D FM applications: Hazard Map of Rainfall induced Flooding Levee breach scenario project
  9. 9. Model
  10. 10. Automatic grid refinement
  11. 11. Impact grid refinement
  12. 12. Analyze results location: Breedeweg (Groesbeek)
  13. 13. Subgrid post processing • Post processing water depths to DTM resolution (0.5x0.5 m) using conservation of flood volume.
  14. 14. Final product – Web Map
  15. 15. Visualizing results Inspect model results in GIS: • Water levels • Water depths • Flow velocities • Stream lines • Velocity vectors
  16. 16. Communication
  17. 17. Water safety: Levee breach scenarios Uit: Leidraad voor het maken van Overstromingssimulaties,Deltares 2018 Februari 2018, In opdracht van RWS-WVL en in samenwerking met het Productieteam Kaarten van de ROR (de EU Richtlijn Overstromingsrisico’s)
  18. 18. Scenario analyse dike ring Hoenzadriel
  19. 19. Start: Delft3D FM Meuse model Developed as a sixth generation model for Rijkswaterstaat: • Follow-up of the WAQUA models • Concept developed in 2017; Implemented in 2018 Compute grid resolution: 8 cells in transverse direction summer bed 40 meters in length direction and in winter bed Geometric data: from Baseline schematizations (j17) Calibrated on different hydrographs: 2014 (Low), 2011 (Medium) and 1995 (High) Boundary conditions: Hydrograph 4000 m3 / s (TMR2006)
  20. 20. Building the model grid
  21. 21. Levee breach
  22. 22. Flooding due to breach
  23. 23. Flow velocities
  24. 24. Comparison with existing scenarios 29 november 2018 No breach growth, instant width
  25. 25. Final remarks: • Delft3D FM has added value in simulating rural flooding compared to conventional modeling (SOBEK). ➢ More flexibility in generating model grid ➢ Better computational performance ➢ Higher level of detail ➢ Better options to visualize and communicate results • Delft3D FM enables a more integrated modeling approach by combining different domains (River - Rural – Urban) into one model schematization. This benefits our understanding of the water system and ultimately should lead to better decision making in our climate change adaptation efforts.

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