黄土区小流域水沙对降雨及土地利用变化响应研究

刘卉芳; 曹文洪; 张晓明; 秦伟

Response of water and sediment to land use in watershed of Losses plateau

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DOI：10.7606/j.issn.1000-7601.2010.02.48

Key Words: Loess area watershed rainfall runoff quantity sediment quantity Soil and Water Assessment Tool model

Author Name	Affiliation
LIU Huifang	Department of Sedimentation, China Institute of Water Resource and Hydropower Research， Beijing 100048, China
CAO Wenhong	Department of Sedimentation, China Institute of Water Resource and Hydropower Research， Beijing 100048, China
ZHANG Xiaoming	Department of Sedimentation, China Institute of Water Resource and Hydropower Research， Beijing 100048, China
QIN Wen	Department of Sedimentation, China Institute of Water Resource and Hydropower Research， Beijing 100048, China

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Abstract:

Rainfall and land use/covering change are two main affecting factors of runoff and sedimentation in a watershed, The study simulate runoff and sediment by SWAT model. This purpose is to study the response on water and sediment to rainfall and land-use change in watershed of Losses plateau in different time scales. The study estimate the effects of rainfall and land use/covering change to runoff and sediment by fixing one of the two factors and changing another method. In the scale of year that the impacts of rainfall on contribution rate of runoff is 84.20%, land-use impacts on contribution rate of runoff is 28.63%. In the month scale, the contribution of rainfall to the runoff is greater than the contribution of land use to runoff, especially in the rainy season, the largest contribution ratio of rainfall and land use to runoff can be 4.5. The results show that the contribution of rainfall to runoff are far greater than the land use to runoff regardless on the scale of year or the moon. In addition to, The results also show the runoff modulus, or sediment modulus are exponentially related to annual precipitation and forest vegetation cover.