Landslide Disaster Risk Identification on National Roads in West Java Province

Geographical and geological areas in Indonesia are prone to disasters. West Java Province itself is in an area with a moderate to a high level of disaster risk in 2015-2018. Based on recorded data, the highest type of disaster in West Java Province was landslides as many as 3, 232 times in 2020. The improper maintenance treatment taken after the disaster is often felt rushed so that the distresses will occur again at the same spot. Hence re-treatment is needed, which requires higher construction costs. For this reason, it is necessary to conduct a study of disaster risk. The research focuses on the natural disaster risk of landslides that impact roads and bridges on national highways in West Java Province. By obtaining disaster-prone locations, it is hoped that appropriate technical recommendations can be given to reduce the impact of disasters. The research method used is conducting a literature study, collecting primary data through field surveys, and collecting secondary data through relevant agencies. The risk index analysis was carried out using the Analysis Hierarchy Process (AHP) method. The weighting of factors and indicators was obtained based on survey results from expert respondents. Of the five factors analyzed, it was found that the hazard factor was the most dominant in the risk of landslides. The risk level of landslides on national roads in West Java Province is clarified into three classes, which 61 sections (63%) are in the low-risk group, 27 sections (27%) are in the moderate risk level, and nine sections (9%) are in the high-risk level.