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利用WEPP模型对不同参数组合模拟下土壤侵蚀实测值与预测值的合理性进行分析与评价.为紫色土区多年侵蚀的预测提供相关参数参考,进而科学有效地指导该区水土保持措施的合理布局与配置,对减轻紫色土坡耕地水土流失具有重要意义.通过不同预测参数组合模拟下,产流产沙量预测值与实测值的模型有效性系数ME、标准差以及Pearson相关系数等指标的对比分析,结果表明:(1)利用计算输入建立土壤参数下获得的预测结果要好于模型自动生成方式下的预测结果;(2)单次降雨侵蚀对产流产沙量的预测结果是合理的,现有WEPP模型对紫色土区水蚀的预测效果也是满足要求的;(3)WEPP模型模拟预测产流量相对于模拟预测产沙量更准确,且10°小区预测效果明显好于15°小区,同为15°农耕地小区预测效果远远好于林地小区.
The WEPP model was used to analyze and evaluate the rationality of soil erosion data and prediction under different combinations of parameters.The relevant parameters for the prediction of multi-year erosion in purple soil area were provided, and the reasonable layout of soil and water conservation measures in this area was guided scientifically and effectively And configuration of soil erosion are important to alleviate the soil and water loss on cultivated purple soil.Under the simulation of different forecasting parameters, the comparison and analysis of the model validity index ME, standard deviation and Pearson correlation coefficient between the predicted value of runoff and sediment yield and the measured value The results show that: (1) Prediction results obtained by using soil parameters of computational input are better than those predicted by model automatic generation; (2) Prediction results of single rainfall erosion on runoff and sediment yield are reasonable, WEPP model also meets the requirements of predicting water erosion in purple soil area. (3) WEPP model is more accurate than simulating predicted sediment yield, and the predicting effect of 10 ° plot is better than that of 15 ° plot. ° Cultivated land plot prediction effect is much better than woodland plots.