斜坡上泥沙起动流速统一公式的建立  

A Unified Formula of Sediment Incipient Velocity on Slopes

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,陕西杨凌712100

出　　处：《长江科学院院报》2018年第4期13-17,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51279170)

摘　　要：为了建立斜坡上泥沙起动流速的统一公式,基于概率论与力学相结合的方法,考虑了细颗粒泥沙之间的黏结力及附加下压力对泥沙起动的影响,引入起动概率与附加质量力,采用滑动起动模型,从理论上推导了该统一公式,包括近底作用流速和垂线平均流速。通过实测资料验证,该公式的计算结果与实测数据符合较好。与其他公式相比,该公式形式简单,计算精度较高,可以用来计算斜坡及平坡条件下黏性、非黏性泥沙的临界起动流速。In line with probability and mechanics theory,a unified formula for the incipient velocity of sediment on slopes(including near bed velocity and average velocity along vertical direction)is deducted by introducing incipient probability and additional mass force in incipient sliding model.The influence of adhesive force and additional downward force among fine sediment particles are taken into consideration.Tested results reveal that calculated data from the formula are well consistent with observed data.The formula is of simple form and good calculation accuracy,hence can be used for the calculation of critical incipient velocity of adhesive and non-adhesive sediment particles on slopes with different dip angles.

关 键 词：黏性泥沙 起动概率 滑动模型 起动流速 统一公式 

分 类 号：TV142[水利工程—水力学及河流动力学]