文献类型： 外文期刊

第一作者： Xiao Bo

作者： Xiao Bo;Wang Qing-Hai;Xiao Bo;Fan Jun;Han Feng-Peng;Dai Quan-Hou

作者机构：

关键词： curve number;initial abstraction ratio;model performance;rainfall;soil and water loss

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2011 年 21 卷 6 期

页码：

收录情况： SCI

摘要： For reasons of simplicity, the most commonly used hydrological models are based on the Soil Conservation Service Curve Number (SCS-CN) model, which is probably a good choice for the estimation of runoff on the Loess Plateau of China; however, the high spatial heterogeneity, mainly caused by a fragmented landform and variations in soil type, may limit its applicability to this region. Therefore, applicability of the SCS-CN model to a small watershed, Liudaogou on the plateau, was evaluated and the most appropriate initial abstraction ratio (I-a/S) value in the model was quantified by the inverse method. The results showed that the standard SCS-CN model was applicable to the estimation of runoff in the Liudaogou watershed and the model performance was acceptable according to the values of relative error and Nash-Sutcliffe efficiency. The most appropriate I-a/S value for the watershed was 0.22 because with this modified I-a/S value, the model performance was slightly improved. The model performance was not sensitive to the modification of the I-a/S value when one heavy rainfall event (50.1 mm) was not considered, which implied that the model, using a standard I-a/S value, can be recommended for the Liudaogou watershed because single rainfall events exceeding 50 mm seldom occurred in that region. The runoff amount predicted for the Liudaogou watershed by the SCS-CN model, using the modified I-a/S value, increased gradually with increasing rainfall when rainfall values were lower than 50 mm, whereas the predicted amount increased rapidly when the rainfall exceeded 50 mm. These findings may be helpful in solving the problem of serious soil and water loss on the Loess Plateau of China.

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