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DSD-INT 2019 Modelling the effects of longitudinal dams on the river morphology - Omer

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Presentation by Amgad Omer, Deltares, at the Delft3D - User Days (Day 3a: River morphodynamics), during Delft Software Days - Edition 2019. Wednesday, 13 November 2019, Delft.

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DSD-INT 2019 Modelling the effects of longitudinal dams on the river morphology - Omer

  1. 1. D e l f t 3 D U s e r D a y s 2 0 1 9 Modelling the effects of longitudinal dams on the river morphology Case study of Waal River Amgad Omer
  2. 2. Delft3DUserDays2019 2 Modelling the effects of longitudinal dams on the river morphology: Case study of Waal River Amgad Omer (amgad.omer@deltares.nl)
  3. 3. Delft3DUserDays2019 3 Modelling the effects of longitudinal dams on the river morphology: Case study of Waal River Amgad Omer (amgad.omer@deltares.nl)
  4. 4. Delft3DUserDays2019 4
  5. 5. The objective ❑ Long-term morphological modelling (30 years) ❑ Opening of the side channels (inflow) ❑ Model provision Delft3DUserDays2019 5
  6. 6. Model setup and boundary conditions Delft3DUserDays2019 6
  7. 7. Model schematization and roughness field ❑ Full model schematizations from Baseline (Rijn_j18 and Rijn_J14) ❑ Roughness is based on Trachy- tope function, Baseline (rijn_j18/j14) and previous studies Delft3DUserDays2019 7
  8. 8. Morphological setup ❑ Modified Van Rijn 1984 ❑ Spin-up for 10 years ❑ Simulation management tool (SMT) and variable Morfac Delft3DUserDays2019 8
  9. 9. Hydraulic validation: Discharge distribution Delft3DUserDays2019 9
  10. 10. Scenarios (variants): 30 yrs simulations Variant Description V0 Without the longitudinal dams (Baseline Rijn- j14) V1 With the longitudinal dams (Baseline Rijn-j18) Open inlets (Baseline Rijn-j18 geometry) V2 With the longitudinal dams (Baseline Rijn-j18) closed inlets (dam crest extended) V3 With the longitudinal dams (Baseline Rijn-j18) Open inlets (As-built survey geometry) V4 With the longitudinal dams (Baseline Rijn-j18) Open inlets (Baseline Rijn-j18 geometry) Including river maintenance Delft3DUserDays2019 10 Variant Description V0 Without the longitudinal dams (Baseline Rijn- j14) V1 With the longitudinal dams (Baseline Rijn-j18) Open inlets (Baseline Rijn-j18 geometry) V2 With the longitudinal dams (Baseline Rijn-j18) closed inlets (dam crest extended) V3 With the longitudinal dams (Baseline Rijn-j18) Open inlets (As-built survey geometry) V4 With the longitudinal dams (Baseline Rijn-j18) Open inlets (Baseline Rijn-j18 geometry) Including river maintenance
  11. 11. Morphological results Delft3DUserDays2019 11 Variant Description V0 Without the longitudinal dams (Baseline Rijn-j14) V1 With the longitudinal dams (Baseline Rijn-j18) Open inlets (Baseline Rijn-j18 geometry)
  12. 12. Morphological results Delft3DUserDays2019 12 Variant Description V1 With the longitudinal dams (Baseline Rijn-j18) Open inlets (Baseline Rijn-j18 geometry) V2 With the longitudinal dams (Baseline Rijn-j18) closed inlets (dam crest extended)
  13. 13. Change in water level Delft3DUserDays2019 13 Variant Description V0 Without the longitudinal dams (Baseline Rijn- j14) V1 With the longitudinal dams (Baseline Rijn-j18) Open inlets (Baseline Rijn-j18 geometry)
  14. 14. Some of the model findings and recommendations ❑ 3 locations => Depositions. High flow: ❑ Closing of Ophemert inlet to the main channel ❑ Closing of Dreumel inlet to the main channel ❑ Closing of Wamel inlet to the main channel ❑ Low flow ❑ DS of Dreumel outlet ❑ Fixation of the side channel ❑ Morphological equilibrium Delft3DUserDays2019 14
  15. 15. Delft3DUserDays2019 15 Inlets of secondary channels
  16. 16. 16 Delft3DUserDays2019

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