Flow resistance and momentum flux in compound open channels

被引:33
|
作者
Cao, Zhixian [1 ]
Meng, Jian
Pender, Gareth
Wallis, Steve
机构
[1] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
[2] Wuhan Univ, Coll Informat Management, Wuhan 430072, Peoples R China
[3] Heriot Watt Univ, Sch Built Environm, Edinburgh EH14 4AS, Midlothian, Scotland
来源
JOURNAL OF HYDRAULIC ENGINEERING-ASCE | 2006年 / 132卷 / 12期
关键词
open channels; open channel flow; flood plains; flow resistance; roughness; flood routing; unsteady flow;
D O I
10.1061/(ASCE)0733-9429(2006)132:12(1272)
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
New formulations are presented for flow resistance and momentum flux in compound open channels. As implemented in the St. Venant equations, these formulations facilitate a physically enhanced approach to evaluating conveyance, roughness, stage-discharge relationship, and unsteady flood routing in compound open channels. An analysis using steady flow data from the well-controlled experiments at the large-scale Flood Channel Facility, FIR Wallingford, demonstrates the ability of the present approach to properly resolve the discontinuity of overall roughness across the main-channel bankfull level. Also, the proposed formulations are shown to be conducive to obviating the long-standing computational difficulty in unsteady flood routing due to small flow depths over flat and wide floodplains. The present work should find general applications in one-dimensional computation of river flows.
引用
收藏
页码:1272 / 1282
页数:11
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