In this paper, the life distribution of a sand particle in four states, the transition strength of sediment from one state to another and the distribution of the beginning of the rest particles on ded surface are given.

• 本文给出了泥沙四种运动状态的寿命分布；处于各种状态的泥沙之间的转移强度以及床面静止颗粒的起动分布等.