Development of Topographical Factor Characteristic Correlation Equation for Debris Flow Disaster Prevention

Purpose: In this study, the relationship between each factor and soil erosion is evaluated in order to simply approximate the amount of soil erosion and sediment runoff in small-scale watersheds or disaster impact assessments. Method: In this study, Linear regression analysis between soil runoff, soil erosion, and topographic factors results in the following criteria: curve number, flow length, bare soil percentage, sand composition ratio, 30- minute maximum rainfall intensity, surface sand, maximum daily probability rainfall, and catchment area between Correlations were analyzed, and the relationship between soil runoff was analyzed and compared. Results: In the correlation analysis of soil erosion and soil runoff for each factor, it was analyzed that the correlation between the basin area and the slope was high. The results of the correlation analysis between the RUSLE equation and the factors did not show a high correlation. Conclusion: The regression equation presented in this study can be applied to the comparative review of the simple estimation and examination of soil runoff in small-scale disaster impact assessment.