水土保持研究2024，Vol.31Issue(6)：74-85,12.DOI:10.13869/j.cnki.rswc.2024.06.013
植被组合方式对坡面流水动力特性的影响
Effects of Vegetation Combinations on Hydrodynamic Characteristics of Overland Flow
摘要
Abstract
[Objective]Indoor flume experiments were conducted to clarify the response trend of overland flow dynamics to various vegetation combinations,to explore the composition of resistance covered by different vegetation combinations,and to explore the regulation mechanism of vegetation combination on overland flow,so as to provide reference basis for rational layout of slope water storage and soil conservation projects.[Methods]The research analyzed the response law,flow resistance variation,and resistance composition of overland flow hydrodynamic parameters under the conditions of different vegetation combinations(single shrub,single grass cover,single row alternation of shrub and grass,alternation of shrub and grass,and bare slope),3 different slope gradients(1°,5°,9°)and 5 kinds of discharge(20,30,40,60,80 L/min).[Results]Vegetation had significant effects on water depth,average velocity,flow pattern,and resistance coefficient(p＜0.05).Compared to bare slope,water depth was 1.07～4.17 times higher with vegetation,and the velocity decreased 2.35％～64.7％.Besides,most experimental flow fell in the transition states.Turbulence intensity of different vegetation combinations followed the order:shrub-grass combination＞single vegetation＞bare slope.Furthermore,the resistance coefficient under vegetation cover was 1.25～25.45 times larger than bare slope,and the effect of water blocking and velocity slowing followed the order:single shrub＞shrub-grass combination＞single grass cover＞bare slope.Resistance was affected by vegetation combination and stem characteristics(p＜0.05).The flow resistance was mainly composed of particle resistance and vegetation resistance under single vegetation cover.However,the interference of rough elements produced additional resistance under shrub-grass combination cover,which weakened the flow resistance with an increase of slope gradient,but strengthened the flow resistance with an increase in discharge under the same slope condition.[Conclusion]The effect of single shrub group is the best,and the effect of interleaved shrub group is similar.关键词
坡面流/植被组合/阻力系数/阻力构成Key words
overland flow/vegetation combination/resistance coefficient/resistance composition分类
农业科技引用本文复制引用
朱艳,王平,马岚,胡杰..植被组合方式对坡面流水动力特性的影响[J].水土保持研究,2024,31(6):74-85,12.基金项目
国家自然科学基金"湿地表面流中物质弥散过渡过程机理研究"(52179056) （52179056）
