Author(s): Jurui Yang; Duo Fang; Wenshe He; Xingnian Liu; Shuyou Cao
Linked Author(s): Xingnian Liu
Keywords: Non-uniform sediment; Incipient motion velocity; Additional force; Flow structure
Abstract: Based on the differences of transport mechanism between the uniform and non-uniform sediment, the additional force acted on non-uniform sediment has been divided into two parts in this paper. One is caused by the force-arm acted on non-uniform sediment. The other is caused by the influence of the non-uniform sediment to the flow structure near river-bed with non-uniform bed material. A formula used to compute the threshold velocity of the non-uniform sediment is established. Based on the experiment and filed data the coefficients in this formula are determined. The results fully reflect the characteristics of threshold motion of non-uniform sediment.