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DSD-INT 2019 New generation models for the Dutch government in Delft3D FM Suite - Spruyt

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Presentation by Aukje Spruyt & Iris Niesten, Deltares, at the Delft3D - User Days (Day 1: Hydrology and hydrodynamics), during Delft Software Days - Edition 2019. Monday, 11 November 2019, Delft.

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DSD-INT 2019 New generation models for the Dutch government in Delft3D FM Suite - Spruyt

  1. 1. 11 November 2019 New generation models for the Dutch government in Delft3D FM Suite Aukje Spruyt & Iris Niesten
  2. 2. Delft3D User Days 2019 Models Dutch water system Complete area for which Dutch government is responsible • 1D, 2D (3D) models for hydrodynamics • Including the seas
  3. 3. Delft3D User Days 2019 Application of models • Real-time forecast (flood and drought) • Permits • Scenario studies big projects • Strategic long term planning (e.g. climate) • Short term water distribution (e.g. at droughts) • Assessing dikes
  4. 4. Modelling train • Same model for all applications → Uniformity • Quality very important → Reproducability • Automation of the different steps as much as possible Delft3D User Days 2019
  5. 5. Model cycle • Every 5-6 year: renew modelling strategy + setting up models again with automatic calibration ➔ Delft3D FM • In-between: actualizing the model (e.g. new bed level) • Use of standard computations for easy comparison of models Delft3D User Days 2019
  6. 6. Modelling train – Baseline Delft3D User Days 2019 Baseline-schematisation: Geo-database with information of the area
  7. 7. Modelling train – Baseline Delft3D User Days 2019 • Geometry • Land use
  8. 8. Modelling train - Baseline Delft3D User Days 2019 • Geometry • Land use • Bed level • Bathymetry
  9. 9. Modelling train – projection on grid Delft3D User Days 2019
  10. 10. Modelling train – 2D-model Delft3D User Days 2019 Conversion to input for 2D-numerical model
  11. 11. Modelling train – 1D-model: SOBEK 3 (transition) Delft3D User Days 2019
  12. 12. Modelling train – Waq2Prof / FM2Prof Delft3D User Days 2019 Main channel floodplainfloodplain FM2Prof
  13. 13. Specificaties new generation models Delft3D User Days 2019 Setting up 2D hydrodynamic models, but taking into account future application for: • Morphology • Water quality • (Waves) • Meteorology • Global models • Regional models and models from abroad
  14. 14. Meuse river Delft3D User Days 2019 • 2D-grid • Curvilineair (where possible) • Aligned with main channel • Calibration on main channel: • Physical roughness • Calibration coefficient • Discharge dependent • Validation on recent periods • Including structures
  15. 15. Rhine branches Delft3D User Days 2019 Set up similar to Meuse model
  16. 16. Base rules for grid design Quality parameters: • Orthogonality: preferably 0 • Smoothness: < 1.2 • Resolution: - • Aspect ratio: < 6 Different approaches for different applications!
  17. 17. Base rules for grid design • Rivers: • Relatively high flow velocities • Constant flow directions • Lakes / seas: • Lower flow velocities • Varying flow direction (weakly dynamic) • Estuaries / deltas: • Lower flow velocities • Constant flow directions • Importance of salinity / density
  18. 18. Base rules for grid design - example • Preference for quadrangles in river-dominated area • Preference for triangles in wind-dominated area • Avoid large number of transitions
  19. 19. Base rules for design - example Conclusions overlap area: • Resemblance of geometry is more important than grid type • Wind-driven flow can still have a main direction
  20. 20. Base rules for grid design - example
  21. 21. Calibration • Calibration based on 5 discharge levels • For Rhine branches: Delft3D User Days 2019 Discharge Lobith (m3/s) L1 800 – 1000 Lowest discharge M1 2000 Almost bankfull M2 4000 Floodplains are flooded, but mostly for retention H1 8000 Highest discharge that was recently measured (2011) H2 12.000 Highest measured discharge (1995)
  22. 22. • “Physical roughness” based on data • Main channel: Simplified van Rijn: 𝑘 𝑠 = 𝐴ℎ0.7 1 − 𝑒−𝐵ℎ−0.3 • Dependent on dune height and grain size • Roughness uncertain → use of calibration factor 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 850 860 870 880 890 900 910 920 930 940 950 960 Alfa[-] Distance (km) Alfa Alfa_fit 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 850 860 870 880 890 900 910 920 930 940 950 960 Duneheight(m) Distance (km) Hd (m) Hd_fit mov. avg. (1.0 km) Calibration: background roughness
  23. 23. Use of calibration factor Calibration factor Roughness 1 Roughness 2 Roughness 3 Delft3D User Days 2019
  24. 24. Structures • Structure control with D-Real Time Control
  25. 25. Results 24 August 2018 IJssel (uncalibrated):
  26. 26. Questions? Delft3D User Days 2019 ? ? ? ? ? ?

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