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本文采用水库泥沙冲淤数学模型，预演紫坪铺水库运用６３年回水变动区河段泥沙淤积发展过程，计算初始条件（库区地形和河床组成）和边界条件（入库流量、沙量和级配过程、水库运行方式）与物理模型试验相同．结果总淤积量相近，淤积发展过程相符，沿程淤积分布基本一致．其次对入库悬移质全级配和扣除细颗粒（０．０８ｍｍ以下部分）的部分级配进行对比计算，结果全级配计算淤积量偏大，水库运用初期淤积速度较快，接近平衡阶段淤积速度较慢，淤积平衡后淤积速度基本一致．
In this paper, mathematical model of erosion and deposition of reservoir sediment is used to predict the development of sediment deposition in the riverbed of the Zhipingpu reservoir in the 63 years of backwater variation. The initial conditions (reservoir topography and riverbed composition) and boundary conditions (inflow, Volume and gradation process, reservoir operation) is the same as the physical model test. The results of the total amount of sediment similar to the deposition of the development process is consistent with the deposition along the silt basically the same. Secondly, the comparison of the grading of the whole suspension with the grading of the suspended solids (less than 0.08mm) was carried out. As a result, the siltation of the whole grading was too large, and the initial deposition of the reservoir was relatively fast, approaching the equilibrium stage Silt deposition rate is slow, the deposition rate is basically the same after deposition balance.