Impact of Different Grass Coverages on the Sediment Yield Process in the Slope-gully System

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  • 1. Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China;
    2. Yangtze River Scientific Research Institute, Changjiang Water Resources Commission, Wuhan 430010, China

Received date: 2004-08-02

  Revised date: 2004-12-28

  Online published: 2005-09-25

Supported by

Joint Fund of National Natural Science Foundation of China and Yellow River Conservancy Commission, No.50239080

Abstract

By scouring experiments, the changeable process and characteristics of sediment yield in the slope-gully system with different coverages and spatial location of grass were studied. Results showed that the sediment yield decreased with increasing grass coverage at smaller water inflow rates in scouring experiments. The sediment yield with different grass locations on the sloping surface was in the order of upper > middle > lower. At larger water inflow rates, the differences of sediment yield among various grass coverage were enlarged, whereas the changeable tendency of sediment yield with different grass locations on the sloping surface was not very obvious. The proportion of sediment yield from the gully increased in an exponential relationship with increasing grass coverage, and the increasing degree for large water inflow rate is larger than that of the small one. When the grass was located on the lower position on sloping surface, the influence for accelerating gully erosion is the largest. The changeable process of sediment yield in slope-gully system was to increase first and then to decrease.

Cite this article

LI Mian, YAO Wenyi, CHEN Jiangnan, DING Wenfeng,YANG Jianfeng, LI Li, YANG Chunxia . Impact of Different Grass Coverages on the Sediment Yield Process in the Slope-gully System[J]. Acta Geographica Sinica, 2005 , 60(5) : 725 -732 . DOI: 10.11821/xb200505003

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