ANALISIS TINGKAT RAWAN LONGSOR DI DAERAH ALIRAN SUNGAI (DAS) DOLAGO KECAMATAN PARIGI SELATAN KABUPATEN PARIGI MOUTONG BERBASIS SISTEM INFORMASI GEOGRAFIS

Abstract

Flash floods occurred in South Parigi District on Sunday, July 12, 2020, which resulted in piles of pieces of wood hitting residents' houses, 7 houses were missing and 12 houses were submerged in water mixed with mud. Efforts to overcome the problem of landslides due to flooding, namely by knowing the causes of landslides, such as the characteristics of climatology, hydrology, and physical conditions of the area. One of the disciplines that influence the problem of landslides is Geographic Information Systems (GIS), for the identification and mapping of areas that have the potential for landslides, such as in the Watershed (DAS). The purpose of this study is to determine the level of vulnerability to landslides in the Dolago Watershed (DAS) South Parigi District, Parigi Moutong Regency. This study uses the overlay method from several maps as a parameter determining landslide-prone areas and is carried out by scoring and weighting the factors that influence the occurrence of landslides to determine the level of landslide-prone areas in the Dolago watershed. Based on the research conducted, it can be concluded that the Dolago watershed has a moderate to high vulnerability to the occurrence of landslides. Dolago watershed with high rainfall intensity, which is in the range of 2,232.8 mm/year. The soil is dominated by red-yellow podzolic and cytosol then the rock type is dominated by Breakthrough/volcanic rocks and the slope is dominated by a slope of >45% where the high values ​​of all these parameters affect and have the potential for landslide disasters.