Investigation of Landslide and Flood Disasters by Using the Geographic Information System in Trenggalek

Trenggalek Regency is an area that often experiences natural disasters, namely floods and landslides. Based on this, research was carried out, namely mapping flood and landslide-prone areas in each sub-district in Trenggalek Regency using a Remote Sensing and Geographic Information System (GIS). The data used to process flood-prone map and landslides-prone map is secondary data obtained from DEM data, soil type maps, BMKG Shapefile Ina-Geoportal data, Google Earth imagery, and Trenggalek Regency BPS data. The secondary data will be processed using ArcGis 10.7 software and produced parameter data for making flood-prone map and landslides-prone in slope, soil type, rainfall, land use, and exposed population in Trenggalek Regency. The parameter data will be used for classification, scoring, and overlay to produce a flood-prone map and landslides-prone map. The flood-prone map shows six districts with a high level of flood vulnerability, namely Tugu, Karangan, Trenggalek, Pogalan, Gandusari, and a small part of Kampak. In contrast, other districts have a moderate level of vulnerability. On the landslide-prone map, it is known that there are three sub-districts with a high level of landslide vulnerability, namely Trenggalek, Watulimo, and Panggul. In contrast, other sub-districts have an average level of landslide vulnerability. From the processing results, it can be concluded that sub-districts with a high population will be more prone to floods or landslides.