No.20 Chegongzhuang West Road, Haidian District, Beijing, China China Institute of Water Resources and Hydropower Research
To study the impact of waterway regulation engineering on river regime adjustment and river evolution, a two-dimensional mathematical model for hydrodynamics and sediment transport of the typical bend reach of the Shaying River (the largest tributary of the Huai River in China) - the Sanba Village bend reach was constructed. After model calibration and validation, it is used to simulate and analyze the impact of the bend beach cutting project on the flow conditions of the bend reach and to reveal the changes in river regime before and after the project. We selected a representative 10-year water and sediment series to simulate the changes in hydraulic and sediment factors before and after the Sanba Village bend beach cutting project, analyzed the beach stability of the newly opened channel, the riverbed undercutting speed, and the sedimentation rate of the old river retained on the left side (before the beach cutting project). It is found that after cutting the bend beach, the flow velocity in the main channel of the river increases, while the flow velocity in the beach decreases. The erosion thickness of the main channel of the Sanba Village bend reach under the condition of cutting the beach is smaller than that under the condition of not cutting the beach, while the sedimentation on the convex bank weakens. Based on the results of water and sediment changes and river evolution laws, the erosion and sedimentation characteristics of the Sanba Village bend reach after channel regulation and the future development trends were estimated.
