摘要
根据分流河道的水沙特性,对现有的水沙输移计算模式进行了分类,总结了分汊河道分流分沙计算模式在国内外研究发展的现状,并进行了简要的分析评论,继而通过水槽试验对分汊河道整体水流结构和底沙输移演化特征进行了初步的探讨.试验结果表明:在汊道洲头和洲尾的局部范围内流速减小较明显,洲尾处出现水流分离区且左右两侧为高流速区;主、支汊流量的分配决定底沙输移强度,最大冲刷深度在主汊分流口下游.
Based on the characteristics of flow and sediment in braided channels, the computational models current used for flow and sediment diversion are classified; and their development at home and aboard is briefly summarized. By means of flume experiment, the flow structure and bed load transport in brai- ded channel are analyzed. The results show that near the head and tail part of island, the decrement of velocity is obvious. At the same time, a zone separated immediately downstream of the confluent channel and high velocity zone at both sides are appeared; the bed load transport and local scour strongly depend on the flow and sediment conditions of mainstream and tributary; the maximum scour depth occurs in the outlet of main-branch.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2007年第4期9-12,17,共5页
Engineering Journal of Wuhan University
基金
国家重点基础研究项目(973项目)资助(编号:2003CB415200)
国家自然科学基金项目资助(编号:50579054)
关键词
分汉河道
分流分沙
含沙量
distributaries channel
diversion of flow and sediment
sediment concentration
