利用紫色土区域某水保站1984-2017年7次典型降雨资料,应用WEPP(water erosion prediction project)模型模拟了不同降雨条件下不同地面坡度的紫色土坡面径流量和侵蚀量,提出了模型评价方法,将模拟值与实测值进行比较,验证WEPP模型及其内置参数在我国紫色土范围内模型预测的可行性及准确性.结果表明,WEPP模型对于紫色土区域水蚀模拟基本可行,产流量的预测比侵蚀量的预测更为合理,低坡度条件下的模拟结果优于高坡度条件.对于侵蚀量的模拟不够理想,高坡度条件下反而模拟较好.对于不同坡度下的侵蚀量进行相关分析,结果表明坡度是影响土壤侵蚀的动力因子,在一定的坡度范围内,随着坡度的增加,土壤侵蚀量与坡度呈幂函数递增关系.%Based on the 7 typical rainfall data from 1984 to 2017 in a soil and water conservation station in the particular purple soil area,the WEPP (water erosion prediction project) model was used to simulate the runoff and erosion amount of the purple soil slope under different rainfall conditions.The simulation method was compared with the measured values to verify the feasibility and accuracy of the WEPP model and its built-in parameters in the model of purple soil in China.The results showed that the WEPP model was basically feasible for the water erosion simulation in the purple soil area,and the prediction of the runoff was more reasonable than the prediction of the erosion amount,and the simulation result under the low slope condition was better than the high slope condition.The results showed that the slope was the dynamic factor that affected the soil erosion.In this slope range,the soil erosion and the slope were increasing with the increase of the slope.
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