DSD-INT 2023 Fast compound flood modelling using reduced complexity model - de Goede
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Presentation by Roel de Goede (Deltares, Netherlands) at the Symposium on Emulating 2D flood modelling, during the Delft Software Days - Edition 2023 (DSD-INT 2023). Wednesday, 27 September 2023, Delft.
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DSD-INT 2023 Fast compound flood modelling using reduced complexity model - de Goede
- 1. Roel de Goede 27-09-2023 Fast compound flood modelling using reduced complexity model SFINCS
- 2. • Provide order of magnitude(s) faster assessments of compound flooding as an additional quickscan tool as part of Deltares numerical modelling solutions SFINCS: Super-Fast INundation of CoastS 2
- 3. Modeling needs to be faster: need for speed! − Large-scale brute force computations − Rapid assessments for desktop studies − Forecasting 100s of ensemble member for extreme weather impacts But, − Bathtub models too simple: lack of physics − Advanced models (e.g. Delft3D, ADCIRC, XBeach) too heavy for very large areas and/or large amounts of scenarios An alternative are reduced-complexity solvers as SFINCS, about 100 times faster (and increasing still). Higher computational efficiency, while still including physics Leijnse et al. 2021, https://doi.org/10.1016/j.coastaleng.2020.103796 Why SFINCS needed: faster computations! 3
- 4. What is SFINCS? • Linear Inertial Equations (Bates et al., 2010) • First order explicit numerical scheme • No morphological change • Variable time-stepping • Single precision for most variables • Streamlined code build for speed • Challenge: keep it simple! 4 Momentum equation: Continuity equation:
- 5. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 5
- 6. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 6
- 7. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 7
- 8. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 8
- 9. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 9
- 10. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 10
- 11. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 11
- 12. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography 12
- 13. Other terms and features • Advection • Point sources (rivers and pumps) • Levees (weir formula) • Rainfall and infiltration • Wind forcing and atmospheric pressure • Coriolis • Viscosity • Geographic coordinates • Sub-grid topography − Compute water levels at much lower resolution but preserve the topgraphic variation at high resolution 13
- 14. 14 500m grid without subgrid Example in reality – 100km of St.Johns river, FL 500m grid with subgrid
- 15. 1. New desktop tool to support adaptation planning Voettekst van de presentatie 15 • Objective: new tool to remove modeling bottlenecks and to empower local communities to understand risk & evaluate • Computational core: − Hazard model: SFINCS − Damage model Delft-FIAT • Commissioned Department of Homeland Security. The City of Charleston pilot application • Easy coupling with FIAT damage tool makes numbers relatable
- 16. 12-FOOT WATER LEVEL (+NAVD88) Damages
- 17. 12-FOOT WATER LEVEL (+NAVD88) Damages
- 18. 2. Operational forecasting Forecasting Hurricane Impacts on CoastS FliFS PoC – Delft Software Days 2022 18 - Operational forecasts during hurricanes of flooding (SFINCS) - 12-hourly 4-day forecasts forced by COAMPS-TC weather model - Continental shelf models forced with tidal components along the 500 m depth contour
- 19. 19 Hurricane Ian SFINCS SW Florida domain Tide + storm surge No rain!
- 20. Hurricane Ian – flood map no rain
- 21. Ensemble members days before landfall (n=1000) created with DeMaria method to account uncertainty Projects with SFINCS overseas at Deltares USA – Kees Nederhoff 21
- 22. Time series Fort Myers show large spread & necessity of probabilistic forecasting days before landfall Projects with SFINCS overseas at Deltares USA – Kees Nederhoff 22
- 24. Latest developments • Quadtree approach • Refinements where you need them • NVIDIA GPUs - speed-ups with a factor 30-50 24
- 25. • SFINCS is Deltares’ super fast flood solver • Already applied in a lot of places over the world • SFINCS is open source: https://www.deltares.nl/en/software/sfincs/ • In case of questions, ask one of us or email: sfincs@deltares.nl Take home 25