水资源与水工程学报2024，Vol.35Issue(1)：133-142,153,11.DOI:10.11705/j.issn.1672-643X.2024.01.16
柔性植被叶片近地表覆盖对坡面流水力学特性的影响
Impact of near-surface coverage by flexible vegetation foliage on the hydrodynamic characteristics of overland flow
摘要
Abstract
The presence of flexible vegetation on slopes has a significant impact on the hydrodynamic prop-erties of overland runoff,which in turn contributes greatly to slope erosion.Prior research has concentrated on the entirety of flexible vegetation,encompassing both stems and foliage.To further elucidate the impact of near-surface flexible vegetation foliage on hydraulic characteristics,simulated slope scouring experiments were conducted to study the hydrodynamic features of overland runoff under three flow rates(0.5,1.0,and 1.5 L/min),five slope gradients(2°,4°,8°,12°,and 16°),five coverage degrees,and two coverage types.This research aims to reveal the influence of near-surface coverage by flexible vegetation foliage on the erosion characteristics of slope soil.To delve into the effects of the foliage of near-surface flexible vege-tation on the hydrodynamic properties,we employed simulated slope erosion tests to examine the hydrody-namics of overland runoff under seven coverage types at flow rates of 0.5,1.0,and 1.5 L/min,so as to uncover how near-surface foliage coverage of flexible vegetation influences the erosion traits of slope soils.The findings indicate that the average flow velocity decreases with the increase of the coverage of flexible vegetation foliage,and the rise in flow rate and slope angle mitigates the reduction in average flow velocity.Both Reynolds number(Re)and Froude number(Fr)diminish as the coverage of flexible vegetation foliage expands,with a pronounced reduction in Fr and a more gradual decrease in Re.The interplay between foli-age coverage and slope gradient significantly influences the flow state.The resistance coefficient increases with the increase of the foliage coverage,suggesting the coverage's role in augmenting resistance.Variations in slope gradient result in a fluctuating resistance coefficient,which decreases first,then increases,and de-creases again,with the transverse morphological resistance of various coverage types under identical condi-tions constituting a larger share of the total resistance.The research results can provide a technical support for the management of slope soil erosion and ecological environment in the Loess Plateau.关键词
柔性植被叶片/坡面流/水力学特性/阻力机制/流态/土壤侵蚀Key words
flexible vegetation foliage/overland runoff/hydrodynamic characteristics/resistance mecha-nism/flow regime/soil erosion分类
农业科技引用本文复制引用
蔡泽康,王健,陈俞池,王晨沣,广彗冰,李锋..柔性植被叶片近地表覆盖对坡面流水力学特性的影响[J].水资源与水工程学报,2024,35(1):133-142,153,11.基金项目
国家自然科学基金项目(41771308) （41771308）
"十四五"国家重点研发计划子课题(2022YFF130080105) （2022YFF130080105）
