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为了研究土质路面草本植被降低水土流失的作用,采用室内人工降雨及放水试验的方法比较了裸露路和植物路的产流产沙过程及径流水动力学特征,结果表明:相对于裸露路,不同覆盖度植物路总径流量降低幅度为3.94%～25.10%,总泥沙量降低幅度为9.65%～45.69%;在大致相同放水量条件下,植物路的土壤侵蚀速率、径流流速和过水断面单位能量均低于裸露路;植物路的Darcy-weisbach阻力系数和曼宁糙率系数分别是裸露路的2.62～9.00倍和1.74～3.53倍;植物路通过降低径流流速、减小过水断面单位能量和增大路面粗糙度及径流阻力起到减轻道路侵蚀的作用。该文为广大土质山坡道路侵蚀防治和植物路铺设提供理论支持。
In order to study the role of herbaceous vegetation in soil pavement in reducing soil and water loss, indoor artificial rainfall and water release tests were used to compare the runoff and sediment yield processes and runoff hydrodynamic characteristics of exposed and vegetated roads. The results showed that compared with bare roads, The decrease of total runoff of degree of vegetation was 3.94% ~ 25.10% and the total amount of sediment decreased by 9.65% ~ 45.69%. Under the same water discharge, the rate of soil erosion, runoff velocity and cross section The energy of Darcy-weisbach drag coefficient and Manning roughness coefficient of plant path are 2.62-9.00 times and 1.74-3.53 times that of bare road respectively. By reducing the runoff velocity and reducing the unit energy of cross-flow section, And increase the roughness and runoff resistance play a role in reducing road erosion. This paper provides theoretical support for the prevention and control of road erosion and the laying of plant roads on the vast soil slopes.