均匀沙起动概率试验研究  

Experimental study on the probability of uniform sand incipient motion

作　　者：麻卉港 张根广[1] 周双[1] 许晓阳 MA Hui-gang;ZHANG Geng-guang;ZHOU Shuang;XU Xiao-yang(Collge of Water Resources and Archiecural Enginering,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》2022年第4期8-14,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：为揭示均匀沙起动概率与水流强度、颗粒床面位置间的关系,基于高速摄影技术,设计了泥沙起动概率水槽试验。通过对不同暴露角及不同水流条件下单颗粒泥沙起动试验观测及统计分析,建立了不同暴露角条件下泥沙起动概率与水流强度间的关系。基于暴露角概率分布及全概率概念,构建了考虑水流紊动作用和泥沙位置随机性的泥沙起动全概率公式。通过与Einstein、Engelund等公式比较,泥沙起动概率概念明确,床面泥沙起动等待时间和起动持续时间观测准确,公式理论推导过程合理,计算结果符合实际。In order to reveal the relationship between the incipient probability of uniform sediment and flow intensity, particle bed position, a flume experiment for sediment initiation probability was designed by high-speed photography technology. Based on the experimental study of single sediment incipient motion under different exposure angles and different flow conditions, the relationship between incipient motion probability and flow intensity under different exposure angles is established. Based on the probability distribution of exposure angle and the concept of total probability, the incipient total probability model of sediment under the action of turbulence and considering the random distribution of position is established. The theoretical derivation of the formula is rigorous, and the calculation results agree with the observed data.

关 键 词：起动概率 全概率 高速摄影 起动等待时间 起动持续时间 暴露角 

分 类 号：TV142.2[水利工程—水力学及河流动力学]