Analysis of Landslide Susceptibility Using Frequency Ratio Methods in the Lisu Watershed, Barru Regency

Abstract

Barru Regency is an area with a relatively high frequency of landslides according to BNPB data for 2015. This can be seen in several incidents from 2017 to 2021. The purpose of this research is to identify and determine the level of vulnerability of landslides that occur in an area by utilizing the method Frequency Ratio. The Lisu watershed study area is a research study because it is included in the largest local watershed in Barru Regency. This study uses landslide occurrence point data by including nine factors that cause landslides such as land cover, slope, slope aspect, elevation, rainfall, curvature, distance from river, distance from fault, and lithology. These nine factors are divided into five classes, namely very low, low, medium, high, and very high. The results of the analysis show that the AUC model success rate and prediction accuracy are 0.80 and 0.83. The very high vulnerability to landslides is spread over the Tanete Riaja and Pujananting Districts. This indicates that the frequency ratio method is appropriate as a basis for analyzing the level of landslide vulnerability in the Lisu watershed.