川江卵石推移质输移的随机性

推移质运动及输沙率是河流动力学的基本问题之一。通过对川江河道实测卵石运动速度及输沙率的整理分析，可知卵石为运动距离短，停歇时间长，平均运动速度低，运动具有很强的随机性及不连续性。对卵石推移质输沙量的年际及年内的变化规律分析表明，卵石推移质输沙率的变差大，统计分布分散，也具有很强的随机性特征。河床断面形态及其相邻河道特性对输沙率也有较大的影响。

The Stochastic Nature of Gravel Bed Load Transport in Chuanjiang River

Bed load motion and its transport rate is one of the basic issues in river dynamics.The authors discuss the stochastic nature of bed load motion in Chuanjiang River in details. The characteristics of channel, hydrology and sediment in Chuanjiang River are introduced. Based on data analysis of gravel movement velocity and its sediment discharge measured in Chuanjiang River,it is found that the gravel not only has the characteristics of short movement distance, long cease time and low movement average velocity, but also its movement has very strong stochastic behavior and discontinuity. The reason for the stochastic nature and discontinuity of gravel movement has been analyzed. The gravel bed load transport rage also has very strong stochastic nature after studying its varying law within annual distribution and average annual distribution. In the meanwhile, the result also show that the section configuration and near watercourse characteristic has influenced gravel bed load transport rate.