论文部分内容阅读
基于水深平均挟沙水流浅水控制方程,引入透水密度系数和阻力项考虑植被群对水流和泥沙运动的影响,建立了充分考虑水流-泥沙-障碍物之间相互作用的耦合数值模型.基于有限体积法离散控制方程,采用Godunov-type中心迎风格式求解单元界面通量.该模型通过水槽洪水实测数据验证,用于研究植被群对溃决洪水和泥沙运动的影响.结果表明:本模型能够模拟溃决洪水演进及底床冲淤变形问题,植被群的存在使得底床冲淤复杂多变,导致植被上游区水位抬升,植被下游区水位明显降低,有助于洪水风险管理.
Based on the shallow water mean sediment-laden flow control equation, the influence of vegetation groups on the water flow and sediment movement was introduced by introducing the water-permeable density coefficient and resistance term, and a coupled numerical model was established to fully consider the interaction between water flow, sediment and obstacles. The finite volume method is used to solve the discrete governing equations, and the Godunov-type center upwind scheme is used to solve the elemental interface fluxes. The model is verified by the measured data of sink floods and used to study the effect of vegetation on the flood and sediment movement. The results show that this model can Simulating the evolution of floods and the scouring and silting deformation of the bed, the existence of vegetation makes the bed scouring and silting complex and changeable, leading to the elevation of water level in the upper reaches of vegetation and the decrease of water level in the lower reaches of the vegetation, contributing to the flood risk management.