In order to predict the sedimentation deposition in the Shuidonggou Reservoir in next few years, the flow in this reservoir is studied using a two dimensional (2-D) hydraulic mathematical model, and the governing equations are modeled with finite volume method (FVM) on unstructured grids. Using the measured data to verify the correctness of the model, and then the 2-D flow movement of several different conditions was simulated. The results show that: when the amount of the water inflow and with the same quantity of the water drawn are the same and unchanged, as the water level drops, water flow velocity increases in the reservoir;the water directly flows to the water intake point, gradually shift to the right bank deviation, and then shift to the left, gradually transformed along the left bank and flow to the intake;the recirculation zone on the left of the water intake point becomes smaller, and the effects of the influent on the right recirculation zone increases gradually. When the amount of the water inflow and quantity of water drawn are not the same and unchanged, as the water level drops, water flow velocity increases in the reservoir;the water directly flows to the tail dam, and then gradually to the right bank deviation, and the effects of the influent on the water intake point increases gradually. Through the simulation of different conditions, movement of the flow in the reservoir was obtained. Combined the measured sediment concentration of the water inlet and water intake, the sedimentation deposition in the reservoir is analyzed and some management suggestions are put forward.%为了预测未来几年水洞沟水库的冲淤情况，在考察库区水流运动规律的基础上，建立平面二维水流运动数学模型，采用非结构网格的有限体积法，利用实测流场数据验证了所建数学模型的正确性。采用该模型对不同工况下水洞沟水库的平面二维水流运动进行数值模拟。结果表明：当进水量与取水量相同且不变时，随着水位的下降，库区流速增大；进水直接流向取水口，然后逐渐向右岸偏移，再向左岸偏移，最后转变为贴着左岸流向取水口；取水口左侧回流区逐渐变小，右侧回流区受进水影响逐渐增大。当进水量大于取水量且不变时，随着水位的下降，库区流速增大，进水主流先向尾坝流动，逐渐偏移为向右岸流动，取水口附近流场受进水影响逐渐增大。通过对不同工况的水流运动数值模拟，得到库区水流运动基本规律，结合进水口、取水口泥沙含量实测数据对库区冲淤情况进行分析，并提出了一些水库运行管理的建议。
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