Development of Web-based Mapping Program for Spatially Distributed Slope Stability Analysis

Abstract

Rainfall-induced landslide is considered as the deadliest disaster in Indonesia. Many efforts have been made to mitigate the landslide, such as landslide hazard mapping in the landslide-prone area. The traditional landslide mapping is commonly conducted using scoring method which is based on field investigation and data collection. The underlying mechanical theory of this method is vague. In this study, a web based slope instability mapping program was developed using well established geotechnical theory in slope stability. This program is based on infinite slope method. To calculate the infiltration depth, Green-Ampt model was employed. In order to investigate performance of the program, a case study is conducted in Gerdu, Karanganyar, Central Java, Indonesia. The result shows that the program can map the spatial distribution of the safety factor nicely. The program also works well with the raster and vector data.