Simulated Study of the interaction between horizontal flow structure and suspended sediment transport in partially vegetated channel
Jiaqi Liu (TU Delft - Water Resources, IHE Delft Institute for Water Education)
Francesco Bregoli (IHE Delft Institute for Water Education)
Wim S.J. Uijttewaal (TU Delft - Environmental Fluid Mechanics)
Alessandra Crosato (IHE Delft Institute for Water Education)
Giulio Calvani (École Polytechnique Fédérale de Lausanne)
Michael McClain (IHE Delft Institute for Water Education, TU Delft - Water Resources)
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Abstract
The presence of instream and riparian vegetation significantly affects the flow field of rivers, which in turn impacts sediment transport (Vargas-Luna et al., 2016, Calvani et al., 2023). Few studies, however, have investigated the interaction between horizontal flow structure and suspended sediment transport. Hamidifar (2019) conducted a flume experiment investigating the flow field structure in a halfvegetated channel configuration and found strong horizontal vortices. Other experimental works observed the strong transverse sediment transport process along the interface area between vegetation and open channel (Box et al., 2018; Xu et al., 2022). As for numerical simulations, few studies focus on the reproduction of the physical processes between the partially channel vegetated flow and suspended solids. The present simulation studies mainly focus on the small-scale large eddy simulation model, which has not been applied in practice (Wang et al. 2021). This study focuses on the effect of horizontal viscosity models on the simulation of suspended solid transport in a partly vegetated channel in the most applied Reynolds-averaged Navier-Stokes model. Three viscosity models: the constant model, the Elder model, and the Hybrid viscosity model are applied to reproduce an experimental work selected from the literature.