水土保持学报2024，Vol.38Issue(3)：19-28,10.DOI:10.13870/j.cnki.stbcxb.2024.03.011
柔性植被倒伏对地表径流水力特性及侵蚀的影响
The Impact of Flexible Vegetation Lodging on the Hydraulic Characteristics of Surface Runoff and Erosion
摘要
Abstract
[Objective]This study was aimed at exploring the influence of nearsurface coverage formed by the collapse of flexible vegetation in reducing runoff and erosion yield,and in modulating the hydraulic properties of surface runoff.[Methods]Based on fundamental principles of fluid mechanics and hydraulics,the erosion patterns and hydrodynamic characteristics under lodged flexible vegetation were systemically investigated through indoor hydrodynamic experiments across five levels of coverage,five slope gradients,and three flow rates.[Results](1)The distribution of erosion volume demonstrated an initial increase followed by a decrease with the increment of slope angle,with the influence of flow rate on the erosion process being more pronounced at steeper slopes.(2)Corresponding to an increase in the coverage of flexible vegetation,and taking 50％coverage as a threshold,the erosion volume generally exhibited a trend of initial reduction followed by an increase.(3)The average flow velocity(v)decreased with increasing vegetative coverage,with the rate of decline becoming gradual as coverage intensified.The variation in Froude number(Fr)mirrored the trend in average flow velocity.The friction coefficient(f)was positively linear correlated with coverage and decreased with an increase in slope gradient;the Reynolds number(Re)demonstrated a higher sensitivity to soil erosion compared to Fr,v,and f.(4)With the increase in vegetation coverage,morphological shear stress intensified(while particle shear stress diminished),playing a pivotal role in the changes in total shear stress,which was positively correlated with vegetation coverage.[Conclusion]The study establishes a solid theoretical foundation for the erosion patterns of slope flow vegetation and facilitates the expansion of open channel hydraulic theories in the realm of slope flows.关键词
坡面流/柔性植被/侵蚀机理/剪切力Key words
slope flow/flexible vegetation/erosion mechanisms/shear stress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,封瑞坤..柔性植被倒伏对地表径流水力特性及侵蚀的影响[J].水土保持学报,2024,38(3):19-28,10.基金项目
国家自然科学基金项目(42377332) （42377332）
