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近１０年来，黄河的来水来沙发生了变化，粗泥沙来量也有所减少，这些变化对水库和河道冲淤都将产生很大影响。本文以研究不同级配泥沙输移特性和冲淤规律为基础，分析不同地区来水来沙对水库和下游河道的影响，三门峡水库正常运用对粗细泥沙的调节作用，以及下游不同河段各粒径级泥沙沿程调整过程，拦减粗泥沙对下游河道冲淤的影响，为水库制定合理运用方式及下游防洪减淤治理决策提供依据。
In the past 10 years, the incoming and outgoing sand of the Yellow River has changed, the amount of coarse sediment also decreased, and these changes will have a great impact on the reservoir and channel erosion and deposition. Based on the study of sediment transport characteristics and scouring and silting laws at different gradation levels, this paper analyzes the influence of incoming and outgoing water and sediment on reservoirs and downstream channels in different areas, the regulation effect of Sanmenxia Reservoir on coarse and fine sediments and the influence of different river sections The adjustment process of sediment along each particle size class and the influence of coarse sediment reduction on the scouring and silting in the lower reaches of the river are provided to provide basis for rational utilization of reservoir and decision-making of flood control and siltation reduction.