Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (20): 4240-4247.doi: 10.3864/j.issn.0578-1752.2011.20.011

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Calibration of SCS-CN Initial Abstraction Ratio of a Typical Small Watershed in the Loess Hilly-Gully Region

 ZHOU  Shu-Mei, LEI  Ting-Wu   

  1. 1.中国科学院水利部水土保持研究所/黄土高原土壤侵蚀与旱地农业国家重点实验室
    2.中国科学院研究生院
    3.中国农业大学水利与土木工程学院
  • Received:2010-09-16 Online:2011-10-15 Published:2011-04-18

Abstract: 【Objective】 The initial abstraction ratio, as one of the basic inputs of SCS-CN method, plays an important role in watershed rainfall-runoff simulation. In this study, attempt was made to determine the initial abstraction ratio of a typical small watershed in the Loess hilly-gully region, in order to supply some references for regional applicability assessment of SCS-CN method. 【Method】In SCS-CN method, the proportion of initial abstraction (Ia) to the maximum retention (S) is defined as initial abstraction ratio, which was believed to have a standard value of 0.2. However, many studies indicate that variations of the ratio exist in different regions. In this study, 14 typical rainstorms in 1987-2006 in Qiaozi-West watershed were selected to calculate the initial abstraction ratio using Back Calculation (BC) and Event Analysis (EA) methods.【Result】Results showed that most of the values calculated by the two methods were lower than the standard value of 0.2. Moreover, the value (0.17) determined by EA method was a little higher than that (0.1) by BC method. By assigning 0.1, 0.17 and 0.2 to initial abstraction ratio, the runoff depth of each study event was calculated, respectively. Through five evaluation criteria of Pearson correlation coefficient (r), model efficiency coefficient (E), relative error (RE), absolute error (AE) and curve fitting, 0.1 was found to be the appropriate value for the watershed initial abstraction ratio. The results indicated that the derived initial abstraction ratio by the two methods differed markedly from the standard value. This may be due to the discrepancies in geologic, geomorphologic and climatic circumstances between the loess hilly-gully region and the originally intended areas of SCS-CN method. 【Conclusion】 It is essential to calibrate the initial abstraction ratio using locally observed data prior to SCS-CN method application.

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