基于三角形网格划分 ,应用破开算子原理 ,建立了平面二维非均匀沙水流泥沙数学模型 ,并使用了平面二维非均匀沙水流挟沙力公式 .着重对河床冲刷过程中悬移质含沙量、河床变形和床沙级配等沿时空变化特性进行了计算分析 ,模拟了概化河道中床沙粗化层的形成过程 .数值实验表明 ,该方法边界符合良好 ,计算量小 ,能准确地模拟出河床冲刷过程中水沙的变化规律 Based on the triangle mesh and the broken operator principle, a two-dimensional mathematical model of inhomogeneous sand flow and sediment in plane is established, and a two-dimensional in-plane sediment carrying capacity formula of inhomogeneous sediment flow is used. The sediment concentration, bed deformation and sediment distribution were analyzed along the spatial and temporal variations to simulate the formation process of coarse sand bed in the generalized channel.The numerical experiments show that the boundary of the method is in good agreement with the small calculation , Can accurately simulate the changes of water and sediment in the process of river bed scouring