基于中间量L的黄河泥沙冲淤问题研究

Study on Intermediate-Volume-Based Scour and Fill Issue of the Yellow River

针对黄河水少沙多、水沙不均衡的现状，首次将河道时段来沙总量和时段平均流量的比值L作为判别河道冲淤的中间量，对兰州至巴彦高勒河段冲淤情况进行了研究，结果表明：①L小于0．5时河道处于冲刷状态；②L介于0．5～2．5时，河道基本上处于冲淤平衡状态；③L大于2．5时河道处于淤积状态，明显具有来沙多、淤得多的特点。

The paper studies the scour and fill of Lanzhou-Bayangaole section by firstly using the proportionality L of the total volume of coming sediment of channel time interval and mean discharge of time interval as intermediate volume for discriminating the scour and fill of channel in the light of the present status of uneven runoff and sediment of the Yellow River. The outcomes show the following characteristics: a) when L<0.5,the channel is in the state of scour;b) when L between 0.5~2.5,the channel is basically in equilibrium and;c) when L>2.5,the channel is in the state of fill,obviously possessing the characteristic of more coming sediment and more deposition.