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Een geïntegreerde aanpak voor de Durme: sub report 7. The effect of upstream discharge and flushing
Nguyen, D.; Stark, J.; Meire, D. (2024). Een geïntegreerde aanpak voor de Durme: sub report 7. The effect of upstream discharge and flushing. Version 4.0. FH reports, 19_016_7. Flanders Hydraulics: Antwerp. VI, 38 + 3p. app. pp. https://dx.doi.org/10.48607/238
Een geïntegreerde aanpak voor de Durme: sub report 7. The effect of upstream discharge and flushing

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Document type: Project report

Keywords
    Hydraulics and sediment > Hydrodynamics > Current velocities  and patterns
    Hydraulics and sediment > Hydrodynamics > Tides
    Numerical modelling
    Belgium, Durme R. [Marine Regions]
Author keywords
    upstream discharge, upstream dredging

Authors  Top 
  • Nguyen, D.
  • Stark, J., more
  • Meire, D., more

Abstract
    In the Durme valley, various management measures are foreseen, such as implementation of new intertidal  areas, changes in the upstream flushing regime and deepening of the river. In this report, the effects of the  changes in upstream discharge and upstream deepening on the hydrodynamics of the Durme river are  evaluated using a hydrodynamic Telemac model of the Durme river.
    A series of model runs was carried out in which the upstream discharge was varied and the upstream  bathymetry was altered. The results show variable responses of the water level, current velocity and tidal  asymmetry. As the changes occur at the river upstream, the effects on river hydrodynamics are stronger in  the upstream river section.
     Upstream deepening causes higher velocity asymmetry within the deepened section, which enhances flood  dominance (for case with small upstream discharge) or weakens ebb dominance (higher upstream discharge  scenarios). Further downstream, the effect reverses and velocity asymmetry weakens. Higher river flow  naturally results in a decrease of flood velocity and an increase of ebb flow. The flood dominant tidal  asymmetry is therefore weaker for higher upstream discharge. An increase in the river discharge could even  result in a transition from flood dominance to ebb dominance in some river sections. In terms of sediment  transport, this could imply that accumulated sediment can be redistributed within the Durme river.

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