摘要
为探明河道灌木植被分布区阻水规律,对灌木植被主干、分枝产生的水流阻力特性及其定量特征进行研究。提出原型植被体积修正系数和灌木植被水力半径确定方法,理论推导灌木植被阻力系数计算公式,并结合水槽试验建立植被阻力系数与植被水力半径为特征长度的植被雷诺数之间的关系式。研究结果表明:引入原型植被体积修正系数和灌木植被水力半径使灌木植被阻力计算更为准确;植被阻力系数与植被雷诺数之间呈指数函数关系,随植被雷诺数的增加呈单调减小的趋势,与水槽试验结果吻合很好。
The water blocking law of the shrub vegetation distribution area in a river was ascertained by examining the characteristics and quantitative characteristics of flow resistance generated by shrub vegetation trunks and branches.Here,we present a prototype vegetation volume correction coefficient and a method for determining shrub vegetation hydraulic radius.The calculation formula of the shrub vegetation resistance coefficient is theoretically derived,and the relationship between the vegetation resistance coefficient and the vegetation Reynolds number with the characteristic length of the vegetation hydraulic radius is established in combination with a flume experiment.Our results indicate that:introduction of a prototype vegetation volume correction coefficient and a shrub vegetation hydraulic radius results in a more accurate shrub vegetation resistance calculation.The relationship between vegetation resistance coefficient and vegetation Reynolds number is an exponential function,and it decreases monotonically with an increase in the vegetation Reynolds number.Results from our flume experiment are in strong agreement with these findings.
作者
陆彦
王唯旭
陆永军
宋云涛
鄢栋梁
LU Yan;WANG Weixu;LU Yongjun;SONG Yuntao;YAN Dongliang(State key laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Nanjing Changjiang Waterway Engineering Bureau,Nanjing 210011,China)
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2020年第4期556-564,共9页
Advances in Water Science
基金
国家重点研发计划资助项目(2016YFC0402108)
江苏省水利科技项目(2017044)。
关键词
灌木植被
体积修正系数
植被水力半径
阻力系数
植被雷诺数
shrub vegetation
vegetation volume correction coefficient
vegetation hydraulic radius
resistance coefficient
vegetation Reynolds number
