Analisis Kerawanan Longsor di Kabupaten Aceh Tengah Berdasarkan Faktor Alam dengan Sistem Informasi Geografis

Abstract

The Aceh Tengah District is an area prone to landslides. This is due to the fact that the topography of Aceh Tengah District is in the form of hills and many micro faults. To reduce the risk of landslide impacts, the authors utilise the Geographic Information System (GIS) as an application for mapping landslide-prone areas. According to Peraturan Menteri Departemen Pekerjaan Umum No. 22 tahun 2007, landslide vulnerability is divided into 3, which are low vulnerability, moderate vulnerability, and high vulnerability. In determining the vulnerability, Peraturan Menteri Pekerjaan Umum divides 2 aspects that cause landslides, notably the natural aspect and the human aspect. This research was conducted according to natural aspects which consisted of 7 indicators, which includes slope, soil type, rock type, rainfall, seismicity, flow density, and vegetation. The mapping in this study was carried out using one of the GIS software, namely Q-GIS. In accordance with this research, the results of mapping the landslide-prone areas were divided into 3 levels of vulnerability. For a low vulnerability level in Aceh Tengah District, is 19,83% or an area of 877,83 km², for a medium vulnerability level is 74,24%or an area of 3286,79 km², and for a high vulnerability level is 5,91% or an area of 262,05 km².