基于床沙随机分布的推移质输移统计规律  

Statistical law of bed-load transport based on stochastic distribution

作　　者：周双[1] 张根广[1] 刘余 王愉乐 ZHOU Shuang;ZHANG Gen-guang;LIU Yu;WANG Yu-le(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《泥沙研究》2020年第6期21-26,共6页Journal of Sediment Research

基　　金：国家自然科学基金项目(51879227;51279170)。

摘　　要：为了进一步完善推移质输移理论,采用暴露高度、暴露角定量分析床沙分布的随机特性,并通过试验对床沙随机分布特性进行研究。统计结果表明,暴露高度与暴露角均服从正态分布。基于微层起动概率概念及相对暴露高度与暴露角分布规律,建立了泥沙起动概率计算式。根据泥沙颗粒的受力平衡,推导推移质运动速度表达式,并且借鉴Engelund输沙模型的构建理念,推导了推移质输沙率公式,并利用经典的推移质输沙率实测数据检验了公式,表明该公式具有较好的适用性。Exposure height and exposure angle are used to quantify the stochastic characteristics of bed sediment positions.Result shows that the statistics of two parameters agree with the Gaussian distribution.Based on the vertical distribution at different flow-layers,the concept of micro-layer incipient probability and a calculation method are proposed and a formula is suggested for the probability based on relative exposure height and exposure angle.This paper derives the mean velocity of bed-load from equilibrium analysis and a formula based on the concept of bed-load transport rate by Engelund.Verification by observed data shows that the new formula shows promise as being reliable in estimating bed-load transport rates in a wide range of transport intensities.

关 键 词：暴露高度 暴露角度 床沙分布 起动概率 推移质输沙 

分 类 号：TV142.2[水利工程—水力学及河流动力学]