基于相对暴露度的河床冲刷率及推移质输沙率公式  

Channel scour rate and bed load transport formula based on relative exposure degree

作　　者：刘佳琪 张根广[1,2,3] 李林林 LIU Jia-qi;ZHANG Gen-guang;LI Lin-lin(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;Arid&Cold Regions Water Engineering Safety Research Center,Yangling 712100,China;Shaanxi Water Engineering Safety&Construction Research Center,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 [2]旱区寒区水工程安全研究中心,陕西杨凌712100 [3]陕西省水工程安全与建设研究中心,陕西杨凌712100

出　　处：《泥沙研究》2020年第4期1-6,共6页Journal of Sediment Research

基　　金：国家自然科学基金项目(51879227,51279170)。

摘　　要：爱因斯坦推移质输沙率公式的理论框架得到普遍认可,但公式在细节处理上尚存在一些不足,很多学者对其进行了修正和改进,但至今有关床面泥沙随机分布特性仍欠考虑。基于床面泥沙相对暴露度概念,计入床面泥沙随机分布特性,采用滚动起动模式,建立了床面泥沙冲刷概率,并对爱因斯坦推移质输沙率公式进行了修正与完善。经实测资料验证,修正后的输沙率公式与实测资料符合良好。Bed load sediment transport rate formula developed by Einstein has been widely recognized,but with defects in theoretical derivation. The formula has been corrected and improved by some scholars. But bed surface sediment characteristics of the random distribution has not been considered in detail. Based on the concept of sediment relative exposure degree on bed surface,the bed surface sediment random distribution characteristics are considered in this paper. Based on rolling incipient mode,a new bed surface sediment erosion probability is developed. Einstein’s theory on bed load transport rate is corrected and improved as well. The revised formula is in good arrangement with observed data.

关 键 词：推移质输沙率 冲刷概率 滚动模型 相对暴露度 

分 类 号：TV142.2[水利工程—水力学及河流动力学]