不同水库拦沙期黄河下游河道调整对比分析

Comparison analysis of river adjustment in different reservoir storage period in downstream of Yellow River

利用实测资料,从实测水沙条件入手,对比分析了三门峡和小浪底水库蓄水拦沙初期,黄河下游冲淤效果,认为小浪底水库拦沙初期,由于水沙量、洪水场次、历时和洪峰流量均减小,导致黄河下游河槽冲刷效率低,且流量较小时,存在上冲下淤的现象;流量在4000m3/s左右时,下游冲刷效率较大。研究成果对小浪底水库运用方式和调水调沙研究有指导意义。

Based on the observed data, the sedimentation and erosion effect in Xiaolangdi Reservoir initial storage period was contrasted with Sanmenxia Reservoir initial storage period. It is considered that the erosion efficiency in downstream of Yellow River was decreased due to the water-sediment amount, flood times, flood duration and peak flow decreased. And there is a phenomenon of erosion in upstream and sedimentation in downstream in lower discharge. When the discharge was about 4000 m^3/s, the erosion efficiency in downstream of Yellow River was larger. The result was significant to reservoir operation model and water and sediment regulation experiment.