Einstein均匀沙推移质输沙率公式的修正  

Modification of Einstein uniform bed load transport rate formula

作　　者：许晓阳 张根广[1] 周双[1] XU Xiao-yang;ZHANG Gen-guang;ZHOU Shuang(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 1\2\00,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》2022年第1期23-29,共7页Journal of Sediment Research

基　　金：国家自然科学基金面上项目(51879227,51279170)。

摘　　要：为更好地完善推移质输移理论,采用无后效的Markov过程描述床沙、推移质和悬移质运动的随机性,推导了新的推移质输沙率公式结构。引入隐蔽角的概念,进一步量化分析床沙位置分布特性。采用全概率泥沙起动概念,推导了考虑水流条件随机性和床沙位置分布特性的泥沙起动全概率。基于垂向脉动流速,得到了泥沙起悬概率,最终构建了新的推移质输沙率公式。经实测资料的验证及与经典的推移质输沙率公式的对比,表明该公式具有更清晰的物理概念及更高的计算精度。Bed load sediment transport rate is significance to river dynamics and the practical application of water conservancy projects.In order to reflect the influence of the randomness of bed sediment,bed load and suspended load movement on sediment transport,the Markov process with no after effect was used to derive a new structure of the bed load transport rate formula.The concept of shelter angle was introduced to quantify the distribution characteristics of the bed sediment position,and the concept of total threshold probability was used to derive the entrainment probability.Considering the vertical fluctuating velocity,the suspension probability was derived,and finally a new bed load sediment transport rate formula was constructed.

关 键 词：均匀沙 泥沙交换 起动全概率 起悬概率 推移质输沙 

分 类 号：TV142.2[水利工程—水力学及河流动力学]