拦减粗泥沙对黄河下游河道冲淤的影响

Influence of Coarse Sediment Retention on the Siltation and Erosion of the lower Reaches of the Yellow River

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。

he water and sediment in the Yellow River has changed with inflowed coarse sediment decreased in the last over 20 years,and these changes will influence greatly on the siltation and erosion in river channel and the reserviors. Based on research of the delivery features and siltation and erosion laws of sediment with different sizes,the paper analysed the influence of water and sediment inflow from various region on the reserviors and lower reaches,the regulation role of Sanmenxia reservior normal operation to the coarse and fine sediment,the realignment of sediment with different size along the reaches,and the influence of coarse sediment retention on the siltation and erosion in the lower reaches,all of that mentioned above provide the basis for decid ing the reservior reasonable operation model and the decision making of flood protection and siltation reduction.