水科学进展2016，Vol.27Issue(6)：832-840,9.DOI:10.14042/j.cnki.32.1309.2016.06.005
植被淹没程度对坡面流水动力学特性影响
Experimental study on hydraulic characteristic of submergence degree to flow under vegetation coverage
摘要
Abstract
In order to explore the inherent law of slope flow structures under vegetation, we systematically re-searched, by testing via artificial vegetation simulation, the influence of submergence on the kinetic characteristics of slope flow in conditions where the vegetation is submerged or unsubmerged. According to the research:given the same gradient, both the average flow velocity and Reynolds number have a positive correlation with the degree of submer-gence;under flexible vegetation, slope flow changes from slow to rapid as the degree of submergence increases, the o-verall resistance coefficient drops with the increase of submergence degree;while under rigid vegetation, slope flow al-ways remains slow, the overall resistance coefficient varies in a curve like single hump, the degree of submergence is 0. 9 when the resistance coefficient peaks. The influence of submergence on the relative friction velocity is opposite to that on the resistance coefficient, the coefficient of determination of an empirical equation for calculating the resistance can be more than 0. 97 based on the degree of submergence; the influence of submergence degree on hydrodynamic parameters is dependent on the slope gradient, so for conservation of soil and water on slopes, appropriate vegetation heights should be determined according to the slope and water depth of hilly regions.关键词
植被覆盖/淹没度/相对摩阻流速/阻力系数/水动力学特性/坡面流Key words
vegetation coverage/submergence degree/relative shear velocity/resistance coefficient/hydraulic characteristic/slope flow分类
农业科技引用本文复制引用
杨帆,张宽地,杨明义,杨婕..植被淹没程度对坡面流水动力学特性影响[J].水科学进展,2016,27(6):832-840,9.基金项目
国家自然科学基金资助项目 （）
