排灌机械工程学报2012，Vol.30Issue(3)：309-314,6.DOI:10.3969/j.issn.1674-8530.2012.03.013
U形渠道水流流速垂向分布规律及模拟
Vertical distribution of streamwise velocity and its prediction in U-shaped channel
摘要
Abstract
To find a guide to water management in field irrigation, the vertical distribution of stream-wise 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 lowered 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 di-mensionless 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.关键词
U形渠道/水流/流速垂向分布/双幂律/灌区Key words
U-shaped channel/streamwise velocity/vertical distribution of velocity/two-power law/irrigation district分类
农业科技引用本文复制引用
杨士红,韩金旭,彭世彰,高晓丽,顾宏,李江安..U形渠道水流流速垂向分布规律及模拟[J].排灌机械工程学报,2012,30(3):309-314,6.基金项目
"十二五"国家科技支撑计划项目(2011BAD25B07) （2011BAD25B07）
黄河水利科学研究院中央级公益性科研院所基本科研业务费专项资金资助项目(HKY-JBYW-2012-15) （HKY-JBYW-2012-15）
