RUSLEモデルによる山地流域の土壌侵食予測値と観測値の比較に関するケーススタディ

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  • A Case Study for Comparison of Predicted and Measured Soil Loss in Mountain Watershed using RUSLE Model
  • Case Study for Comparison of Predicted and Measured Soil Loss in Mountain Watershed using RUSLE Model

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The purpose of this research is to evaluate an availability of the Revised Universal Soil Loss Equation (RUSLE) for predicting soil loss values for a mountain watershed in Japan. Estimates of the erosion index (EI30) and the rainfall erosivity factor (R) of RUSLE can be obtained from daily rainfall data from 1993 to 1998. The soil erodibility and topographic factors of RUSLE were evaluated using soil sampling and digital elevation data respectively. The data of soil loss at a measurement station in the Kawamukai watershed was used for verification of this model. The average values of annual soil loss measured and predicted for the watershed are 27.7 kg·ha-1·y-1 and 28.9kg·ha-1·y-1 respectively. The difference between them is only 4 percent. Thus, it is concluded that the RUSLE model can predict reasonable soil loss in Kawamukai watershed during the study period.

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