采用有限体积和有限差分相结合的数值方法,建立了一维溃坝水沙数学模型,基于新集水库库区泥沙淤积演算成果,分别对其在蓄水初期进行纯水溃坝计算和淤积一定年限以后进行水沙溃坝计算,合理地模拟了溃坝后断面流量和水位变化过程、河床冲淤变形等结果,并分析了泥沙因素对溃坝洪水波传播的影响. Based on numerical calculation of finite volume and finite difference, a one-dimensional dam-break mathematical model for water and sediment was established. Based on the results of sediment deposition in the reservoir area of ​​Xinji Reservoir, After a certain number of years, the calculation of water and sand dam breakage is carried out, and the result of cross-section flow and water level change and riverbed scouring and silting deformation is reasonably simulated. The influence of sediment on dam wave flood wave propagation is also analyzed.