水科学进展2024，Vol.35Issue(2)：256-264,9.DOI:10.14042/j.cnki.32.1309.2024.02.007
淹没刚性植被明渠紊流沿程流动特性差异
A study on the differences of turbulent flow properties along the open channel with submerged rigid vegetation
摘要
Abstract
Submerged rigid vegetation causes uneven vertical distribution and streamwise differences of hydraulic parameters such as time-averaged flow velocity,turbulence intensity,and Reynolds stress by altering the flow structure.ADV is adopted to measure the flow velocity under three submergence ratios of 3.0,4.0,and 5.0,combined with statistical methods,the differences in velocity and turbulence characteristics within the vegetation section and its upstream and downstream transition sections are systematically analyzed.The results show that vegetation significantly enhances water flow turbulence,and the values of turbulence characteristics are positively correlated with submergence ratios.Within the vegetation segment,the differences in velocity are more significant in the two vertical zones:one is the vegetation layer under low submergence and the other is the free flow layer under high submergence.Furthermore,the values of turbulence characteristics are enhanced along the path,and the vertical distribution has similarity,with the location of maximum point is near the top of the canopy.When the submergence ratio meets the formation and development conditions of KH vortices,the turning point appears gradually in the vertical distribution curves of turbulent characteristics within the vegetation segment,near which the gradient value sharply decreases and approaches 0.In addition,the number of cross sections with turning points increases with submergence ratios increasing.It is verified that this point can serve as the upper boundary point of KH vortices in the fully developed turbulent flow region.关键词
刚性植被/淹没度/时均流速/紊动特性/声学多普勒测速仪Key words
rigid vegetation/submergence ratio/time-averaged velocity/turbulence characteristics/ADV分类
建筑与水利引用本文复制引用
陈月君,赵连军,王瑶,朱子春,谈广鸣,王明阳..淹没刚性植被明渠紊流沿程流动特性差异[J].水科学进展,2024,35(2):256-264,9.基金项目
国家重点研发计划资助项目(2023YFC3206201) （2023YFC3206201）
国家自然科学基金资助项目(U2243219) The study is financially supported by the National Key R&D Program of China(No.2023YFC3206201)and the National Natural Science Foundation of China(No.U2243219). （U2243219）
