Study on laws of incipient motion for non-uniform sediment on sloping land

According to the incipient motion characteristic of the fine particle sediments,the binding power is one of the forces acting on the sediment,the idea of exposure degree is accepted in this paper to reflect the enclosed and exposed effect between sediments,and the exposure degree obtained by statistical method is used in the formula of incipient velocity of sediments.A formula for calculating the incipient motion of cohesion non-uniform sediment on sloping land is established by using the rolling mode and verified by experiment data.It shows that the calculated results are well agree with the experiment data,and the exposure degree of binding power acting on incipient motion of cohesion non-uniform sediment on sloping land is reasonable.