中文摘要：

以水洞沟水库水沙运动为研究对象，利用二维水沙运动数学模型，使用非结构网格对计算区域进行了网格划分，采用有限体积法对水洞沟水库水沙运动进行了数值模拟，并与实测结果进行了对比分析，然后对两种设计供水工况下的水沙运动进行了数值模拟。结果表明：①所建立的二维水沙模型是合理的，能够较为精确地模拟水洞沟水库水沙的二维运动；②断面垂线平均流速、库底变形的模拟值和实测值较为一致，说明非结构网格有限体积法是适用的。

英文摘要：

The flow and sedimentation Shuidonggou Reservoir in Ningxia were studied by two-dimensional hydraulic and sediment mathematical model. The governing equations of the model were diseretized with finite volume method on unstructured grids. The simulated and observed values were compared and analyzed. And the water and sediment movement of two conditions were simulated. The results show that： a） the established two-dimensional model of water and sediment is reasonable, the model can accurately simulate the flow and sediment transport in Shuidonggou Res- ervoir; b） numerical results of vertical mean velocity and bed elevation are obtained and the results show that both the simulated and measured val- ues are in good agreement. It shows that the unstructured grid finite volume method is applicable in the study.