Effect of Slope on Landslide Potential at Kuranji Watershed

Abstract

The Kuranji watershed is one of the largest watersheds in the city of Padang. Several landslides and floods have been reported in this area. Many factors cause landslides, both natural and non-natural factors. One of the natural factors that cause landslides is the topography/slope condition. The sloping/steep topography in the downstream area of the Kuranji watershed causes a high potential for landslides in this area. Landslides occur due to balance disturbances that cause the movement of soil and rock masses from a higher place to a lower place. Therefore, it is necessary to analyze slope stability to determine the effect of slope conditions on the potential for landslides. In this study, an analysis of the potential for slopes stability was carried out using the Ordinary Method of Slices. The analysis is carried out by making different slopes so that the value of the safety factor will be obtained from each slope. The slope variation used in this study is the ratio of height to slope width of 1:5, 1:4, 1:3, 1:2, 1:1, 1:0.5, 1:0.25. The results showed that the smaller the slope and the height of the slope, the more stable the slope will be, on the contrary, the larger the slope, the more unstable the slope. This can be assessed from the value safety factor (SF) of slope stability which is obtained from the calculation, which is getting smaller as the slope and height of the slope decrease.

Assessment of factors causing landslides using the Analytical Hierarchy Process (AHP) method

“…One method that can be used is to look for the major factors of landslides. The causes of landslides can vary greatly, including geological, hydrological, climatic, topographic, and anthropogenic factors [8,9,10].…”