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| Application of the SCS-CN method on runoff estimation in small watershed on Loess Plateau |
| Wang Ying<sup>1,2</sup>,Huang Mingbin<sup>1,3</sup> |
| 1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Science and Ministry of Water Resources,712100,Yangling,Shaanxi;2.Graduate University of Chinese Academy of Science,100049,Beijing;3.Northwest Science and Technology University of Agriculture and Forestry,712100,Yangling,Shaanxi: China |
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Abstract The Soil Conservation Service curve number(SCS-CN) method is widely used for predicting direct runoff from rainfall for the areas without observed runoff data,the application of this method in the Loess Plateau was limited because that the difference of climate,hydrology and underlying surface.Focus on the characteristic of rainfall,initial abstraction ration λ was optimized by using 303 rainfall-runoff events from 3 watersheds in the Loess Plateau.And further more,a rainfall intensity adjusting factor for rainfall was developed and incorporated into the SCS-CN method,and its model parameters were optimized with an <i>E</i> value of 0.812,and the <i>R</i><sup>2</sup> of regression equation between the measured and estimated values was 0.822.The results showed that the improved SCS-CN method can be used to estimate runoff in small watershed on Loess Plateau.It has important meaning for predicting direct runoff and soil erosion from rainfall for the area without observed runoff data on Loess Plateau,for guiding configuration and design of soil and water conservation engineering.
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Received: 19 November 2007
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