考虑起动概率的岸坡均匀沙起动流速公式

Incipient velocity of uniform sediment with threshold probability on riverbank slopes

基于泥沙颗粒相对暴露度及起动概率对泥沙起动的影响,引入附加质量力,采用滑动起动模型,从理论上直接推导出了适用于河流岸坡不同起动概率的散粒体泥沙统一起动流速公式,完善了现有公式较少考虑起动概率的不足。经弯道与顺直岸坡、正负坡及平坡等不同岸坡条件下实测资料验证,公式计算结果与实测数据符合较好。

Based on concepts of relative exposure degree and threshold probability of non-cohesive sediment particles,the additional mass force were introduced in this article.On the basis of the sliding model,the theoretical formula of depth-averaged velocity applied to different threshold probability on the riverbank slopes and non-horizontal was deduced.In addition,the formula in this article can be simplified into sediment incipient motion velocity on positive and negative slopes.The calculated value were coincides well with the measured data by verification.Furthermore,the theoretical formula can be used to calculate incipient motion velocity of sediment particles on the straight and curve riverbank slopes.