不均匀床沙组成及起动  

Composition and competent velocity of non-uniform bed load

作　　者：方红卫[1] 

机构地区：[1]清华大学水电系

出　　处：《水利学报》1994年第4期43-49,共7页Journal of Hydraulic Engineering

摘　　要：文中首先应用概率统计方法研究了不均匀床沙位置之间相互遮蔽的关系，并将暴露度的概念引入不均匀床沙的研究中．然后再根据暴露度并结合底速的随机脉动探讨了床沙起动的规律计算结果表明，这种方法较符合实际．Different compositions of non-uniform bed load often result in different river bed boundaries. Near the river bed boundary, generation of eddy has pronounced effect on the assignment and transfer of the flow energy.Past research seldom concentrated on the stochastic composition of bed load affecting the river bed boundary and competent velocity of bed load.This paper takes the exposition height,which is probability of different diameter particle compositions, as characteristic value of the stochastic compositions of bed load,and takes account of the flow turbulence of bottom velocity to establish the formula of competent velocity of bed load.

关 键 词：不均匀床沙 随机变量 起动 流速 

分 类 号：TV142[水利工程—水力学及河流动力学]