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DSD-INT 2018 Floodplain Circulation Dynamics - van der Steeg

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Presentation by Shailesh van der Steeg, University of South Carolina, USA, 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 Floodplain Circulation Dynamics - van der Steeg

  1. 1. Floodplain Circulation Dynamics Shailesh van der Steeg | University of South Carolina
  2. 2. Floodplain Circulation Dynamics N
  3. 3. 3River Floodplain Floodplain Circulation Dynamics
  4. 4. What do we want to do? Insight into conditions, processes and complexity of floodplain circulation • Flooding and drainage of surface water Why? • Floodplain circulation has not been studied extensively • Provide a baseline of how flow in a natural regime occurs • Hazard mitigation or ecosystem stability 4 Floodplain Circulation Dynamics
  5. 5. No exchange 5 River-floodplain exchange Flow and Transport Exchange • Below bank full flow conditions • No surface water exchange • Stage rises above levee elevation • Surface water exchange Figures not drawn to scale A’ A A’: Innerbank A: Outerbank by overbank flow Top view Stage Stage
  6. 6. • There are other forms of exchange • Floodplain channels 6 River-floodplain exchange Flow and Transport Figures not drawn to scale • Different types of floodplain channels: • Long-lived, permanent • Transient A’ A Top view A’: Innerbank A: Outerbank Stage
  7. 7. 7 River-floodplain exchange Levee Channel Bed River bed Figures not drawn to scale Levee
  8. 8. Congaree River & Floodplain Study Site
  9. 9. Study Site: Where in the world? 9 South Carolina Southwest of Columbia, South Carolina
  10. 10. Study Site: Congaree River & Floodplain 10 N
  11. 11. Study Site: Topography 11 N Elevation [m], NAVD88 38 22
  12. 12. • Floodplain channels with levees • Range in dimensions of channels • Oxbow lakes • Scroll bars 12 Study Site: Relief Local Relief
  13. 13. Acoustic Doppler Current Profiler: • During high flow events 13 Study Site: Data collection Pressure sensors: • 32 sensors employed in the field
  14. 14. Study Site: Data collection 14 N
  15. 15. 15 Study Site: Data collection Waterlevel,detrended[m] Time
  16. 16. Study Site: Data collection 16 N 0.12 0.63 0.08 0.71 0.17 0.71 Pearson Correlation Coefficient
  17. 17. Hydrodynamic modeling High resolution modeling using Delft3D FM Suite
  18. 18. • Channelized and overland flow • 2D or 3D • Floodplain topography important (e.g. Alsdorf et al., 2007) • Adequate representation of topographic features • Computational grid • Efficient • Sufficient resolution • Resolve ‘small’ scale flow dynamics • Sediment transport 18 Floodplain hydrodynamic modeling
  19. 19. Northern Floodplain Congaree River Southern Floodplain Computational Grid N
  20. 20. Computational Grid: Structured Mesh? N
  21. 21. Computational Grid: Flexible Mesh! N
  22. 22. Computational Grid: Flexible Mesh! N
  23. 23. Observation Cross-sections Computational Grid: Grid Snapped Features N
  24. 24. Computational Grid: Flexible Mesh! N Local mesh refinement
  25. 25. • Collected data will provide a high level of validation • Different (artificial) flow scenarios to investigate inundation patterns • Sediment transport • Implications for sediment transport 25 Looking forward…
  26. 26. 26 Looking forward…
  27. 27. Floodplain Circulation Dynamics Shailesh van der Steeg | University of South Carolina

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