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| Effects of grass coverage on shallow flow hydraulic parameters and sediment reduction |
| Wang Lingling,Yao Wenyi,Shen Zhenzhou,Yang Chunxia |
| Yellow River Institute of Hydraulic,450003,Zhengzhou,China |
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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.
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Received: 26 March 2008
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