Study on the influential factors of SCS-CN model parameter S in the Loess Plateau area

作者：Li Shexin; Li Zhanbin; Li Peng; Tiegang Zhang

来源：Nature Environment and Pollution Technology, 2016, 15(2): 707-713.

• Influential factors
• Loess Plateau area
• Model parameters
• Rainfall intensity
• Rainfall process
• Retention parameter (S)
• Scs-cn methods
• U.s. department of agricultures

SCS-CN method, developed by the U.S. Department of Agriculture, is simple, effective and can be used in the area having lack of rainfall process data, thus has been widely used to estimate the runoff. In this study, 213 runoff events from 9 plots at Zizhou located on the Loess Plateau area, were studied and applied to calibrate water storage capability of soil which is donated as S in the SCS-CN method. The influence factors of S parameter were then analysed. The results show that the main influence factor of S is initial abstraction Ia. The initial abstraction ratio (Ia / S) at Tuanshangou watershed is 0.03. The maximum 30-minute rainfall intensity, 5-day prior rainfall amount and soil moisture in the top 20 cm soil layer has no influence on the S parameter.

• 出版日期2016