Vulnerability Analysis of Landslide Disaster in Nagari Sungai Pinang, Sungai Nyalo and Mandeh, XI Tarusan Sub-District, Pesisir Selatan

Abstract

Natural disasters are disasters caused by events or a series of events caused by nature, including earthquakes, tsunamis, volcanic eruptions, floods, droughts, hurricanes, and landslides. Landslide is a phenomenon that causes vertical movement of the ground surface, especially in sloped areas and often causes property and even life losses. The condition of vulnerability to landslides can be supported by natural factors such as rainfall, geological conditions, soil types, and slopes as well as factors that can come from nature with human intervention such as land cover.  The combination of anthropogenic factors and natural factors is basically the main cause of the emergence of this level of landslide vulnerability so that it is important to design mitigation efforts, both preventive and repressive, by analyzing the potential for landslide disasters that may arise in an area.  One of the steps to support this problem is to provide an overview related to disaster vulnerability analysis supported by the appearance of data information from the results of GIS processing (Geographical Information System). This research focused on 3 (three) nagari areas including the Sungai Pinang, Sungai Nyalo, and Mandeh. The results of the initial description of the research area based on regional characteristics from secondary data used related to information on slope, soil type, geology, land use, and rainfall as a reference, each of which has a role that is interrelated with one another. The result found that, the parametric overlay by GIS that been used produce a description of the analysis that the level of vulnerability to landslides in the Nagari Sungai Pinang, Sungai Nyalo, and Mandeh areas is at the moderate to high level. The landslide susceptibility level starts from very low, low, medium, high, and very high levels, respectively, in the percentages of 1.30%, 6.24%, 42.93%, 41.74%, and 7.80%.