Reproducing Suspended Sediment Transport in Half-Channel Vegetated Flow Using 2D Horizontal Eddy Viscosity Models
Jiaqi Liu (IHE Delft Institute for Water Education, TU Delft - Surface and Groundwater Hydrology)
Francesco Bregoli (IHE Delft Institute for Water Education)
Wim Uijttewaal (TU Delft - Lab Hydraulic Engineering)
Alessandra Crosato (IHE Delft Institute for Water Education)
Giulio Calvani (École Polytechnique Fédérale de Lausanne)
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Abstract
In river systems, transported suspended sediment interacts with in-channel and riparian vegetation. The involved physical processes are complex and still poorly reproduced by numerical models. This study compares the performance of background horizontal eddy viscosity models in reproducing flow fields and suspended sediment transport processes inside partially vegetated flows. Particularly, we selected an experiment with a partly-vegetated flume which we numerically replicated with the Delft 3D-2DH model. We applied three existing horizontal eddy viscosity approaches: constant value, Elder model and hybrid model. Besides, we represented the vegetation by using Baptist formulation. The results show that the Elder viscosity model reproduces the explicit development of vortices along the flume, while all three viscosity models show an underestimate of the sediment deposition in the vegetated area and an overestimation of sediment deposition in the non-vegetated area. Further investigation is needed to reproduce the experimental introduction of the sediment and to link transversal suspended sediment dynamics with the resolved dynamics in numerical models.