黄河下游河道的冲淤变化是制定下游防洪规划措施的一项重要依据 ,黄河下游河道泥沙数学模型是研究下游河道冲淤变化的重要手段。利用多个泥沙数学模型对不同水沙系列以及小浪底水库不同运用方式条件下下游河道的冲淤变化进行了分析计算 ,预测了 2 0 2 0年以前下游河道的冲淤变化 Scouring and silting changes in the lower reaches of the Yellow River is an important basis for formulating downstream flood control planning measures. The sediment mathematical model of the lower Yellow River is an important means to study the variation of scouring and silting in the lower reaches of the Yellow River. Using multiple sediment mathematical models, the variation of scouring and silting in the downstream channels of different water-sediment series and Xiaolangdi Reservoir are analyzed and calculated, and the variation of scouring and silting in the lower reaches of the river before 2020 is predicted