Landslide hazard assessment based on human activity in the upstream area

Abstract

Hazard is an event that can cause damage, loss of human life, or environmental damage. One of the hazards that often occurs in the upstream area is landslides. Karangkobar is one of the region in the upstream area that had experienced a major landslide at 2014 which resulted 105 houses buried in land and 95 people were dead. The landslide disaster that has occurred in the Karangkobar catchment area is caused by the topography of the hills, high slopes, thick soil solum, soil texture, cropping pattern and treated land that inconsistent with conservation rules. This research aimed to analyse the hazard of landslide disaster based on physics and human activity aspects in the Karangkobar catchment area. Assessment of hazard analysis made by overlay between physics and human activity aspects then given scores and weights. Overlay created with Arc GIS 10.4.1 and scoring is given to assign values to each parameter disaster. The weighting was analysed by Analytical Hierarchy Process (AHP) with pairwise method and using Expert Choice V.11 software. The result showed that the percentage of landslide hazard in the Karangkobar catchment area based on physics are 42.06% low, 38.03 % medium, and 19.38 % high, while based on physics that combine with human activities are 34.64% low, 46.05 % medium, and 19.3 % high. This shows that total area for medium hazard was increase in the Karangkobar catchment area. It caused not only by natural conditions, but also human activities give effect on it.