Date of Publication: 30-Nov--0001
Landslide Susceptibility Mapping: A Case Study in Thenmala Sub-Watershed, Southern Western Ghats, India
Author: Sudha Hariharan, Smitha Asok V., Rajesh Reghunath
Category: Research Article
The study intended to evaluate the landslide susceptibility in sub-watershed area with contrasting structural elements in the southern Western Ghats, Kerala India, using remote sensing and GIS techniques. In order to model landslide susceptibility, data from various sources, such as, topographical maps, geological data and satellite images were collected and processed to generate a spatial database in a GIS platform. As landslides are influenced by several environmental determinants, different factors, such as slope, distance from drainage segments, lithology, distance from lineaments, land use/land cover, and precipitation distribution, should be considered for the analysis. Further, landslide locations of the study area could be identified from satellite images and field survey. The main objective of the study was to describe the association between landslide and landslide conditioning factors for Thenmala sub-watershed regions using the weights-of-evidence method and to create landslide susceptibility map of the study area. Landslide locations were used to validate the results of the landslide susceptibility map. Hence, the study has special significance with respect to the planning and management of mountainous landscapes in the State of Kerala.
Keywords: GIS, India, landslide hazard zonation, mountainous regions, slope