摘要
为探明卵石耦合不同植被类型下坡面流阻力变化规律,基于明渠水力学理论,在5°缓坡条件下,通过5个流量和3个覆盖度组合条件下的室内放水冲刷试验,系统研究了卵石压盖坡面下植被水流的阻力特征。结果表明,卵石压盖下,曼宁系数n随单宽流量q的增加而缓慢增加,最后趋于稳定值0.027;卵石耦合植被作用下n随q先有一个缓慢下降的过程,最后呈上下波动的趋势;曼宁系数和平均流速U、弗劳德数Fr呈递减的幂函数关系,与阻力系数f呈递增的幂函数关系;明渠中n与f的关系式应用于卵石压盖的裸坡时还需进一步验证,但对卵石耦合植被下的坡面水流拟合度较好。
Based on open channel hydrodynamics theory,at the slope gradient of 5°,the resistance characteristics of overland flow under vegetation coupled with pebbles were systematically investigated under five flow discharges and three coverage degrees so as to explore the variation rule of overland flow resistance of pebble coupled with different vegetation types.The results show that under pebbles covered,the Manning coefficient nincreases slowly with unit width discharge q and then tends to be a constant value of 0.027;Under the action of pebble coupling vegetation,the value of ndecreases slowly with qand fluctuates up and down in the end.The Manning coefficient is negatively correlated with the average velocity Uand Froude number Fr and positively correlated with the resistance coefficient f.Further verification is needed when nand fequations of open channel are applied to pebble capping slope,but the equations has a good fitting degree for the cobble coupling vegetation.
作者
何贵平
谢艳
雷孝章
HE Gui-ping;XIE Yan;LEI Xiao-zhang(College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China;State Key Laboratory of Hydraulics and Mountain River Protection,Sichuan University,Chengdu 610065,China)
出处
《水电能源科学》
北大核心
2021年第6期25-28,54,共5页
Water Resources and Power
基金
国家自然科学基金项目(41772321)
震后农村小流域土质边坡稳定性提升的生态恢复研究(2020YFN0011)。
关键词
柔性植被
刚性植被
曼宁系数
坡面流
flexible vegetation
rigid vegetation
Manning coefficient
overland flow
