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草被覆盖度对坡面流水力学参数的影响及其减沙效应
引用本文:王玲玲,姚文艺,申震洲,杨春霞.草被覆盖度对坡面流水力学参数的影响及其减沙效应[J].中国水土保持科学,2009,7(1):80-83.
作者姓名:王玲玲  姚文艺  申震洲  杨春霞
作者单位:黄河水利科学研究院,450003,郑州
基金项目:国家重点基础研究发展规划(973计划),水利部黄河泥沙重点实验室基金,黄河水利科学研究院院长基金 
摘    要:为研究坡面生物措施减蚀作用,利用试验土槽和放水冲刷方法,探讨不同流量、覆盖度条件下坡面流水力学参数的特征,以及草被拦沙效应。结果表明,有草被覆盖的坡面薄层流的流态基本上呈过渡流和紊流;坡面流的弗劳德数与雷诺数分别为0.27~2.04和326~1538,阻力系数为8.30~16.29,且随着流量的增加,草被覆盖度对这些参数的影响减弱;与裸坡相比,30%和70%覆盖度坡面水流平均流速降低25%和47%,草被具有显著的减沙效应,但随着流量的加大,草被对坡面流的阻滞作用呈下降趋势。

关 键 词:草被覆盖度  坡面流  水力学参数  减沙效应

Effects of grass coverage on shallow flow hydraulic parameters and sediment reduction
Wang Lingling,Yao Wenyi,Shen Zhenzhou,Yang Chunxia.Effects of grass coverage on shallow flow hydraulic parameters and sediment reduction[J].Science of Soil and Water Conservation,2009,7(1):80-83.
Authors:Wang Lingling  Yao Wenyi  Shen Zhenzhou  Yang Chunxia
Affiliation:Yellow River Institute of Hydraulic,450003,Zhengzhou,China
Abstract:The experiment is to study the soil erosion characteristic under different grass coverage,flow amount on slope.The result shows that: the flow on slope covered by grass is turbulent flow or transition flow;the Re is changing between 0.27 and 2.04,the Fr is changing between 326 and 1 538,the f is changing between 8.3 and 16.29.Average velocity of flow on slope under 30% and 70% coverage is reduced by 25% and 47% respectively compared with bare slope,Grass cover could reduces the sediment yield,but the effect of drag flow will be weaken with the discharge increasing.
Keywords:grass coverage  shallow flow  hydraulic parameters  sediment reduction effect
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