黄河三门峡建库前后44年下游河道冲淤变化特征分析

An Analysis of Varying Behaviors of Scoring and Silting of Downstream River Channel in 44 Years Before and After the Construction of Reservior of the Yellow River Samen Gorge

对三门峡建库前后44年下游河道的冲淤变化特征作了全面系统地分析研究。黄河下游河道逐年淤高，原因是来水少、来沙多，超过河床输沙能力所致，下游河床只适应于平均含沙量50kg／m3左右的洪水。本研究可为下游防洪、河道整治以及小浪底水库运用方式提供科学依据。

This paper analyses and studies varying behaviors of scoring and silting of donstreamriver channel in 44 years before and after the construction of reservoir in an overall and systematicway. The silting up of the downstream river channel of the yellow River increases year by year,whose cause is that there are less incoming water and more incoming sediments, which surpassthe sediment carrying capacity of the river channel. The downstream river bed can only be adapt-able to flood water with sediment content of 50kg/m3 on the average. This research can provide acertain scicntific base for the downstream flood control, realignment of river channel and opera-tional pattern of Xiaolangdi Reservoir.