人民长江2025，Vol.56Issue(4)：176-185,10.DOI:10.16232/j.cnki.1001-4179.2025.04.024
植被密度对工程陡坡径流水动力特性影响
Impact of vegetation densities on hydrodynamic characteristics of runoff on engineering steep slopes
摘要
Abstract
To explore the impact of vegetation density on hydrodynamic characteristics of runoff on engineering steep slopes,based on field simulated rainfall experiments,bare slopes(Bare slope,BS)were used as controls to analyze the hydrodynamic characteristics of two densities of Paspalum notatum Flugge(PF10:10 cm × 10 cm,PF20:20 cm × 20 cm)under three rainfall intensities and their differences from bare slopes,revealing the dynamic mechanism of vegetation-protected steep slope erosion.The results showed that:① Both bare slopes and vegetated steep slopes exhibited laminar flow(Reynolds number＜100),but the flow pattern varied between slow and rapid flows depending on different rainfall intensities.PF10 and PF20 reduced the average Reynolds number by 54.49％and 5.95％,respectively,and reduced the average Froude number by 41.69％ and 33.80％,re-spectively.② When rainfall intensity was less than or equal to 1.5 mm/min,vegetation reduced flow velocity,but at 2.0 mm/min,PF20 increased flow velocity while PF1O still reduced it.The benefit of PF1O in reducing average flow velocity was 1.98 times that of PF20.However,both densities of vegetation significantly increased the runoff resistance coefficient,with PF10 in-creasing the resistance coefficient by 1.47 times that of PF20.③ PF 10 reduced the average runoff shear stress and runoff power by 23.06％ and 54.89％,respectively,while PF20 reduced the average runoff power by 9.79％ but increased the average runoff shear stress by 22.87％.From the aspect of runoff power,an optimal hydrodynamic parameter for characterizing steep slope ero-sion,the erodibility of PF20 and PF10 was 98.44％ and 48.43％ of that of the bare slope,respectively.The research results can provide scientific guidance for vegetation restoration on engineering steep slopes.关键词
工程陡坡/水动力/植被密度/模拟降雨Key words
engineering steep slopes/hydrodynamics/vegetation density/simulated rainfall分类
农业科技引用本文复制引用
李季孝,郭锐,谢淑彦,徐小坤,吴光耀..植被密度对工程陡坡径流水动力特性影响[J].人民长江,2025,56(4):176-185,10.基金项目
云南省科技计划项目"星云湖东西大河流域农业面源污染监测关键技术研究"(202402AE090024) （202402AE090024）
云南省重点研发计划项目"智慧水电工程安全运行关键技术研究"(202203AA080009) （202203AA080009）
