Analysis of the landslides vulnerability level using frequency ratio method in Tangka Watershed

Abstract

In Indonesia, the number of landslide disasters case increase each year, especially in watershed. The main factor of landslide is a gravity in slope. Another factor like the high intensity of rainfall, the wrong use of sloping land and geology structure. Focusing the many cases of landslide, this project is aim to Analysis of the Landslides Vulnerability Level Using Frequency Ratio Method in Tangka Watershed. This research was started from July-September 2019. We used Tangka Watershed Map, Imagery of Landsat 7, DEM National Imagery resolution 8-meter, geology map scale 1: 50.000, rainfall intensity from BMKG 10 years ago and imagery time series from Google Earth Pro to analyze the landslide factor, like slope, river distance, fracture distance, lithology, land cover, curvature, and aspect. Frequency Ratio Method used to analyze and get the landslide vulnerability level. There are 191 polygons in landslide inventory among 2004-2014. The frequency ratio in land cover is 5.99. It means there are higher potency of landslide in land cover area than another area.

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