Comparative evaluation of two models in predicting storm soil loss from erosion plots in semi-arid Spain
Comparative evaluation of two models in predicting storm soil loss from erosion plots in semi-arid Spain
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DOI：
10.1016/0341-8162(89)90010-6
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发表时间：
1989-06
期刊：
影响因子：
6.2
通讯作者：
J. Montoro;M. Stocking
中科院分区：
文献类型：
--
作者：
J. Montoro;M. Stocking
土壤流失模型通常用于获取侵蚀估计以用于规划目的。本文询问在未设计的条件下使用两种广泛使用的模型（通用土壤流失方程 (USLE) 和南部非洲土壤流失估算模型 (SLEMSA)）是否安全。报告了半干旱西班牙东南部的三个小型流域侵蚀地块，其中提供了 24 个测量到的风暴土壤流失事件。将实际土壤流失与 USLE 和 SLEMSA 的预测结果进行比较表明，根据当前方程因子值的知识，这两个模型都不能完全应用。 USLE 给出了大约正确的预测幅度，但值的分布太小，SLEMSA 给出了更好的土壤流失排名预测，但大大低估了幅度。必须得出的结论是，盲目地将经验模型应用于未测量的情况不会给出可靠的土壤流失预测。
Soil loss models are commonly applied to obtain estimates of erosion for planning purposes. This paper asks whether it is safe to utilise two widely-used models, the Universal Soil Loss Equation (USLE) and the Soil Loss Estimation Model for Southern Africa (SLEMSA), to conditions for which they were not designed.Three mini-catchment erosion plots in semi-arid SE Spain are reported, which between them gave 24 measured storm soil loss events. Comparing this actual soil loss with what would be predicted by USLE and SLEMSA indicated that neither model can completely be applied with current knowledge of equation factor values. USLE gave approximately the right magnitude for prediction but with too low a spread in values and SLEMSA gave the better prediction of rank order of soil loss but greatly underestimated magnitude. It must be concluded that the blind application of empirical models to unmeasured situations will not give reliable predictions of soil loss.