排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2012, Vol. 30 Issue (3): 309-314    DOI: 10.3969/j.issn.1674-8530.2012.03.013
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Vertical distribution of streamwise velocity and its prediction in Ushaped channel
 YANG  Shi-Hong1, HAN  Jin-Xu2, PENG  Shi-Zhang1, GAO  Xiao-Li1, GU  Hong3, LI  Jiang-An3
(1. State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Yellow River Institute of Hydraulic Research, Zhengzhou, Henan 450003, China; 3. Gaoyou Municipal Water Affairs Bureau, Gaoyou, Jiangsu 225600, China)
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Abstract To find a guide to water management in field irrigation, the vertical distribution of streamwise velocity in a Ushaped open channel was clarified by means of indoor and field experiments. In addition, a twopower law for such a distribution was established by using the law of velocity in asymmetric closed channel. The methods for defining the parameters in the twopower law were given, and then the law was validated by the experimental data. The results showed that the flow velocity was lowered with increasing water depth, but the peak velocity appeared under the free surface. The predicted velocity distribution by the twopower law agreed with the experimental data in the 0.10-0.95 dimensionless depth so well that the error was as small as 5%, suggesting the law can involve the effect of free surface and channel wall. Compared with the traditional law of velocity distribution, the twopower law is more accurate, and may be used in an open channel with a crosssection of other shape.
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YANG Shi-Hong
HAN Jin-Xu
PENG Shi-Zhang
GAO Xiao-Li
GU Hong
LI Jiang-An
Key wordsU shaped channel   streamwise velocity   vertical distribution of velocity   two power law   irrigation district     
Received: 2011-12-22; Published: 2012-04-10
Cite this article:   
YANG Shi-Hong,HAN Jin-Xu,PENG Shi-Zhang et al. Vertical distribution of streamwise velocity and its prediction in Ushaped channel[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(3): 309-314.
 
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