GeoWEPP在黄土高原地区应用的适用性评价

Evaluation of applicability of GeoWEPP model on Loess Plateau in China

WEPP模型是由美国农业部组织开发的土壤水蚀预报模型,研究从两方面来探讨流域版GeoWEPP在黄土高原地区应用的适用性:①GeoWEPP模拟时输入的基本气象参数精度检验;②GeoWEPP对流域侵蚀产沙模拟的精度评价。结果表明,由WEPP模型CLIGEN气候发生器生成气象数据不仅较好反映了实测值,而且精确表达了普通或极端天气的实际分布;GeoWEPP对黄土高原流域径流和输沙进行模拟,模拟值与实测值的绝对误差小于30%,相关系数大于0.90,Nash-Sutcliffe系数大于0.80,模拟值较好反映了实测值。

The paper discusses the applicability of the GeoWEPP model on the Loess Plateau in China.First,the accuracy of simulated meteorological data produced by the CLIGEN weather generator was examined.Then,the performance of simulated soil erosion by the GeoWEPP model was evaluated.The results show that the simulated meteorological data produced by the CLIGEN weather generator were not only performed a good agreement with the observed data,but also reproduced the distributions of normal and extreme conditions.The absolute errors between the simulated and observed values of both of water yield and sediment yield were lower than 30%.Their coefficients of determination were higher than 0.90 and the Nash-Sutcliffe coefficients of them were lager than 0.80,which meant the simulated had a good agreement with the observed.