长江科学院院报2017，Vol.34Issue(7)：7-11,5.DOI:10.11988/ckyyb.20160402
基于概率统计理论的泥沙起动流速研究
Research on Sediment Incipient Velocity Based onProbability Statistics Theory
摘要
Abstract
In order to fully reflect the randomness of sediment''s incipient movement, we deduced a formula of incipient velocity suitable for both coarse and fine grains by using a sediment rolling initiation model based on the probability density distribution of dimensionless exposure degree of the grains.The stochastic characteristics of instantaneous flow velocity and sediment particle arrangement on a bed surface were also considered in this paper.Then, the incipient velocities calculated by the proposed formula were compared with measured data and those by several classical incipient velocity formulae.The results show that the incipient velocities calculated by the proposed formula are in more agreement with the measured data than those calculated by the classical formulae.Therefore, the proposed formula''s reliability and superiority in predicting incipient movement of coarse and fine sediment are testified.关键词
泥沙/起动流速/暴露度/瞬时流速/概率统计Key words
sediment/incipient velocity/exposure degree/instantaneous velocity/probability statistics分类
建筑与水利引用本文复制引用
吴彰松,张根广,寇潭,高远,李林林..基于概率统计理论的泥沙起动流速研究[J].长江科学院院报,2017,34(7):7-11,5.基金项目
国家自然科学基金项目(51279170) （51279170）
