对水库下游河床泥沙冲淤变化数值模拟研究已有很多报道 ,但对水库溢洪道下游具有天然覆盖层河道因未泄过洪水没有实测资料供模型验证、且覆盖层分层较明显和表层覆盖层具有粘性作用等 ,目前有关这方面研究成果报道较少 本文建立了正交曲线坐标系下平面二维泥沙数学模型 ,并应用于柘林水库下游河床泥沙冲淤变化计算 ,同时 ,对计算中的有关参数选择进行了详细地分析 ,计算结果可供有关部门参考 There have been many reports on the numerical simulation of sediment erosion and sedimentation in the lower reaches of the reservoir. However, there is no experimental data for the natural coverage in the downstream of the reservoir spillway because of the non-discharge of flood waters. There are few reports about the research results in this area at present. In this paper, a mathematical model of two-dimensional sediment transport in orthogonal curvilinear coordinate system is established and applied to the calculation of sediment scouring and silting changes in the lower reaches of Zhelin Reservoir. At the same time, In the choice of parameters were analyzed in detail, the calculation results available to the relevant departments for reference