Flow over and around submerged groynes
Numerical modelling and analysis of a groyne flume experiment
Lindert Ambagts (TU Delft - Civil Engineering & Geosciences)
Wim Uijttewaal – Mentor (TU Delft - Environmental Fluid Mechanics)
Erik Mosselman – Graduation committee member (TU Delft - Rivers, Ports, Waterways and Dredging Engineering)
Robert Jan Labeur – Graduation committee member (TU Delft - Environmental Fluid Mechanics)
Kees Sloff – Graduation committee member (TU Delft - Rivers, Ports, Waterways and Dredging Engineering)
Mohamed Yossef – Graduation committee member (Deltares)
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Abstract
In submerged conditions groynes add resistance to a river, thereby increasing the water levels for a particular discharge. Groynes are modelled in two ways, either they are included in the bed topography when the grid resolution is sufficiently high or with a sub-grid parametrisation when the grid cell-size is larger than the geometry of the groyne. To investigate the flow patterns over and around groynes, data from a groyne flume experiment, as carried out by the BAW, is analysed. This to investigate to what extent a groyne behaves as a weir. The experiment is modelled in 2DH and in 3D to compare the performance of the sub-grid parametrisation with full 3D non-hydrostatic simulations.