Study Of Slope Vulnerability And Landslide Potential On Gang Singa Region – Ambon City

Nusye M. Leweharila, Novita L. Lebang, Vector Johannes, Felix C.J. Kastanya, Ricardo F. Nanuru, Maya Laisila

The slope structure is dominated by densely populated residential areas with a slope of 3.6°- 20.25° and the height of the location varies from the highest with an altitude of more than 113 m above sea level, and the lowest with an altitude of 12-23 m above sea level. This structure requires practical and efficient solutions especially in the rainy season. This greatly affects the stability of the slope associated with the carrying capacity of the soil and the stability of the slope. The purpose of this study was to detect early potential vulnerability to slopes, especially during the rainy season and determine the steps to handle slopes or cliffs that are considered prone to landslides. The analysis of slope vulnerability and stability in Gang Singa area were analyzed based on geomorphological, topographic and watershed data according to satellite radar image maps and results of soil investigations and field instrumentation. It is known that the landslide is strongly influenced by an increase in water content. The most dangerous causes of the increase in water content for the soil are seepage in the direction of the landslide field, an increase in ground water level and infiltration that exceeds the capacity of soil infiltration. From the results of the study it was found that the highest rainfall took place around May - July, which was 805.1 mm, with the highest number of rainy days in 2017 totaling 265 days. The slope which reached 20° also affected the surface water flow rate, erosion of surface soil layers, and soil structure dominated by sandy soil.Thus, forest conservation, availability of drainage, and vegetation (soil bioengineering) became the main solution in maintaining slope stability from potential landslides in addition to optimizing embankment and sediment traps as flood control structures on Alat Way river and slopes in Gang Singa area that can hold soil sediment and function restore land cover, so that the slope is maintained and safe from landslides.

Volume 12 | Issue 6

Pages: 612-617

DOI: 10.5373/JARDCS/V12I6/S20201070