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DSD-INT 2019 Large scale 2D-river modelling in German waterways-Promny

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Presentation by Markus Promny, Federal Institute of Hydrology (BfG), Germany, 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 Large scale 2D-river modelling in German waterways-Promny

  1. 1. Large scale 2D-river modelling in German waterways – experiences, results and wishes for the future Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 Dr.-Ing. Markus Promny Dipl.-Ing. Matthias Hammer M.Sc. Wiebke Schramm M.Sc. Steffen Holl Dipl.-Geoökol. Marcus Hatz promny@bafg.de Federal Institute of Hydrology (BfG) Am Mainzer Tor 1 D-56068 Koblenz
  2. 2. Our aim: Modelling and understanding of all aspects of our river systems Three main fields of work: water quantity, quality and ecology 2 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 Weser river (360 km) • contractor: Hydrotec • main objective: improved rating curves for 22 gauges Elbe + Havel rivers (410 km) • BfG modelling team • main objective: improved flood protection (triggered by 2013 flood event) Delft3D FM models at BfG
  3. 3. Elbe-Havel models Layout 3 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 Elbe (free flowing) 2 planned polders dike relocations vegetation and flood plain measures Havel polder region (3 impoundments) 6 existing polders (filled by dike removal) optimization of flood retention scheme Havel + Spree region (4 impoundments) optimization of weir operation directly coupled (storage of Elbe water in Havel polders)
  4. 4. Data base and model specifications 4 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 • curved rectangular grid in main channels • triangles in flood plains and polders • groynes as grid-independent fixed weirs • 1-D elements for small tributaries and connecting channels topography: digital terrain models (1m-resolution) roughness: • digital land-use models (trachytope type in flood plain) • simplified van Rijn equation in main channels with parameter A used for calibration data base: machine: Dell LINUX high-performance -cluster >300 cpu
  5. 5. meas./mod. 2013 flood 5 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 Calibration and Validation gauge measurements, water level measurements, discharges, inundation maps calibration validation meas./mod. 2011 flood
  6. 6. 6 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 depth averaged velocities 10 June 2013 at 00:00 Video polder inlet Warnau Simulation of past flood events example: flow patterns at 2013 flood event
  7. 7. 7 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 Simulation of past flood events inundation of 2013 flood inundation on 15 June 2013 model result aerial photo source: LfU Brandenburg
  8. 8. Scenarios for optimization 8 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 • scenarios without actual dike breaks • position and size of polder inlets • retention scheme based on impoundment operation of Havel / Spree • operation scheme of inlet weir from Elbe to Havel „Neuwerben“
  9. 9. Situation of Havel mouth into Elbe 9 Elbemodell (seit 2014) Havelpoldermodell (seit 2016) Havel-Spree-Modell (seit 2019) weir group including weir Neuwerben weir Gnevsdorf Schafhorst/Twerl Vehlgast/Flöthgraben Gr. Grabenniederung Warnau Trübengraben Kümmernitz 2013 flood: Havelberg hydrograph (mod./meas.) Havel inflow hydrograph (mod./meas.)
  10. 10. RTC of weir Neuwerben 10 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 effective observation point at existing gauge „Neuwerben EP“ new observation point gauge „Neuwerben new“? rating curve influenced by weir discharge! increasing weir discharge 0 … 700 m³/s weir Neuwerben
  11. 11. 11 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 RTC of weir Neuwerben effective control scheme: w.r.t. pre calculated discharge (of weir Neuwerben) for capping of gauge Wittenberge (Elbe) suggested control scheme: w.r.t. pre calculated water level (at gauge „Neuwerben new“) modelled water level effective suggested of gauge Wittenberge
  12. 12. Outlook 14 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 existing Delft3D FM models at BfG step-by-step extension of Delft3D model network possibly first by import of 1D- SOBEK-models or existing other 2D- models
  13. 13. Thank you very much for your attention! 15 Delft3D - User Days (Day 1): Hydrology and hydrodynamics – 11.11.2019 PolderHavel polder inlet Warnau 10 June 2013 (photo: LHW Sachsen-Anhalt) model result for inlet Warnau 10 June 2013 Polder

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