基于全概率的推移质输沙率公式  

Formula of bed-load sediment transport based on full threshold probability

作　　者：李林林[1] 张根广[1] LI Lin-lin;ZHANG Gen-guang(College of Water Resource 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

出　　处：《泥沙研究》2018年第6期15-22,共8页Journal of Sediment Research

基　　金：国家自然科学基金项目(51279170)

摘　　要：对于床面泥沙而言,起动过程中主要受水流随机性及床面泥沙颗粒相对位置的随机性等两方面因素的影响,其中床面泥沙颗粒相对位置的随机性用相对暴露度表示。在前人研究的基础上,同时将水流的随机性及泥沙相对位置的随机性考虑到起动概率的研究中,采用滑动起动模型,从理论上推导出泥沙起动的全概率公式,弥补了已有研究的不足。然后根据Einstein的假定,从单宽输沙率的定义出发,引入泥沙起动的全概率,得到了床面上泥沙起动的单宽推移质输沙率公式及输沙强度计算公式;通过水槽试验及野外实测资料验证表明,本文公式结构合理,计算精度较高,适用范围更广。Main factors infect sediment incipient motion on bed surface sediment are the randomness and the relative position of sediment particles,randomness of water flow,and the position of sediment particles reflec- ted by relative exposure degree.On the basis of previous studies,the randomness of water flow and relative lo- cation of sediment are considered into the study of full threshold probability.At the same time,theoretical full threshold probability formula of sediment incipient motion using sliding model is derived.According to the as- sumption by Einstein,the full threshold probability of sediment was introduced,and the formula of bed-load sediment transport based on the definition of sediment transport rate on per unit width was derived.Verified by the flume test and field measured data,the formula of bed-load sediment transport based on full threshold probability possesses reasonable structure,higher calculation accuracy,and wider application scopes.

关 键 词：全概率 相对暴露度 水流条件 随机性 推移质输沙率 

分 类 号：TV142.2[水利工程—水力学及河流动力学]