Bed Load Transport Rates during Scouring and Armoring Processes  

作　　者：YANG Fengguang LIU Xingnian CAO Shuyou HUANG Er 

机构地区：[1]State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China

出　　处：《Journal of Mountain Science》2010年第3期215-225,共11页山地科学学报（英文）

基　　金：supported by 973 Program (2008CB425803);the National Natural Science Foundation of China (Grant No. 50979064)

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.

关 键 词：Nonuniform sediment angle of repose bed scour armoring incipient velocity bed loadtransport 

分 类 号：TV142.2[水利工程—水力学及河流动力学] TV147