黄河下游游荡河道萎缩过程中的河床演变趋势

Tendency of Channel Change of the Lower Yellow River During Its Shrinkage

由于人类活动与自然因素影响下的水沙变化 ,黄河下游自 2 0世纪 70年代初期特别是 80年代中期以来发生了明显的河床萎缩。河宽束窄 ,宽深比减小 ,主流线摆动幅度减小 ,深泓线弯曲系数增大。这表明 。

Due to the changes in runoff and sediment load induced by human activities and the changing natural factors, marked channel shrinkage has occurred in the lower Yellow River since the 1970s, especially since the mid\|1980s. The bankfull width of the channel became smaller, the width to depth ratio became lower, the lateral shifting of thalweg was greatly reduced, and the thalweg sinuosity became higher. All these indicate that the intensity of \!wandering\' of the lower Yellow River declined to some degree.