Slope Studies Mapping of Landslide Hazard: A Study on Namchi, Sikkim Using Gis

Abstract

This paper presents a case study of slope studies in Namchi, Sikkim, India, using Geographic Information System (GIS) to map landslide hazards. The GIS analysis was used to identify areas of steep slopes that have high potential for slope instability and thus landslide hazard. The results of the study showed that the highest landslide hazard was located in the areas of steep slopes and along the river channels. The study also found that the areas of high landslide hazard were also areas of high land cover change. As per the Centre for Research at the Epidemiology of Disasters (CRED), landslide positioned fifth in expressions of number of passing is out of top ten biggest significant disasters. Inside Himalaya district, Sikkim Darjeeling Himalayas is one of the best landslide inclined regions. AHP is widely used in site selection and suitability, habitat suitability analysis, and LHZ and mapping. A formal land use land cover classification was prepared using Arc GIS. A soil map was available from DRDO database. Geology and lithology map were given by DRDO database and weightage was given according to the importance. A layer of relief including slope and degree of aspect were included in the study. This research at is an attempt on this way and attempts to investigate the components assuming principle role inside the occurrence of landslide in this area.