中文摘要：

搜索的导致 Dambreak 的床可以破坏桥墩和另外的结构的基础，并且那破坏能形成严肃的威胁。因而，这份报纸瞄准探索搜索和 armoring 的机制。第一，为不一致的沉积粒子的早期的速度被学习，并且一个公式基于不一致的沉积的休息的角度被导出。结果证明为沙和好石子的早期的运动的机制为粗糙的石子和卵石不同于那。另外，比较在之间试验性并且从建议公式的结果与那些同意很好的地数据表演为所有条件观察了。第二，出生死亡，移民移民 Markov 过程被开发描述与搜索和 armoring 联系的床负担运输率。尽管可以有一些限制，其首领是在通过实验坚定的模型有许多变量，在试验性的数据和计算结果之间的比较证明我们的模型能预言床负担运输率。这在河工程做它的应用程序不方便。

英文摘要：

Dambreak-induced bed scouring may undermine the foundation of bridge piers and other structures, and that destruction can pose a serious threat. Consequently, this paper aims at exploring the mechanisms of scouring and armoring. Firstly, the incipient velocity for nonuniform sediment particles was studied, and a formula was derived based on the angle of repose of nonuniform sediment. The results showed that the mechanism of incipient motion for sand and fine gravel differed from that for coarse gravel and cobbles. Also, comparison between experimental and field data shows that the results from the proposed formula agree well with those observed for all conditions. Secondly, a birth-death, immigration-emigration Markov process was developed to describe the bed load transport rate associated with scouring and armoring. The comparison between experimental data and computed results shows that our model can predict the bed load transport rate, although there may be some limitations, the chief of which is that there are many variables in the model to be determined through experiment. This makes its application in river engineering inconvenient.