Flow resistance and momentum flux in compound open channels
被引:33
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作者:
Cao, Zhixian
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机构:
Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R ChinaWuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
Cao, Zhixian
[1
]
Meng, Jian
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机构:Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
Meng, Jian
Pender, Gareth
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机构:Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
Pender, Gareth
Wallis, Steve
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机构:Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
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
JOURNAL OF HYDRAULIC ENGINEERING-ASCE
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2006年
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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.