摘要
基于水槽试验,系统的研究了在5种流量、3种植被组合和3种覆盖密度情况下的坡面流的水力参数、水力因子间的关系和阻力规律。结果表明,坡面流一般为湍流,植被的存在增强了坡面流的湍流强度。平均流速与单宽流量幂函数相关,且拟合结果良好。柔性植被对流速的减缓作用大于刚性植被。柔性植被坡面和刚性植被坡面的阻力系数均随雷诺数的增加呈幂函数递减。
Based on flume experiments,the hydraulic parameters,the relationship among hydraulic factors and the law of resistance under 5 discharges,3 vegetation combinations and 3 coverage densities are systematically studied.The results show that the flow pattern of the thin and sheet layer flow on the slope is generally turbulent,and the presence of vegetation enhances the turbulent intensity of the flow.The power function can be used to simulate the relationship between average velocity and discharge per width,and the fitting results are good.The mitigation effect of flexible vegetation on velocity is greater than that of rigid vegetation.The resistance of both the flexible vegetation slope and the rigid vegetation slope decreases as a power function with the increase in Reynolds number.
作者
谢艳
朱崇林
雷孝章
XIE Yan;ZHU Chong-lin;LEI Xiao-zhang(College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China;State Key Laboratory of Hydraulics and Mountain River Protection,Chengdu 610065,China)
出处
《中国农村水利水电》
北大核心
2021年第2期18-23,共6页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(41772321)。
关键词
坡面流
柔性植被
刚性植被
水流流态
阻力规律
overland flow
flexible vegetation
rigid vegetation
flow patterns
law of resistance
