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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Modelling the effects of longitudinal dams
on the river morphology
Case study of Waal River
Amgad Omer

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Modelling the effects of longitudinal dams on the river
morphology: Case study of Waal River
Amgad Omer (amgad.omer@deltares.nl)

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Modelling the effects of longitudinal dams on the river
morphology: Case study of Waal River
Amgad Omer (amgad.omer@deltares.nl)

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5. The objective
❑ Long-term morphological modelling
(30 years)
❑ Opening of the side channels
(inflow)
❑ Model provision
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6. Model setup and boundary conditions
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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
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8. Morphological setup
❑ Modified Van Rijn 1984
❑ Spin-up for 10 years
❑ Simulation management tool (SMT)
and variable Morfac
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9. Hydraulic validation: Discharge distribution
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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
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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. Morphological results
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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. Morphological results
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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. Change in water level
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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. 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
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Inlets of secondary channels

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