Landslide Susceptibility Mapping Using AHP Along Mechuka Valley, Arunachal Pradesh, India

Abstract

An integrated approach based on remote sensing and GIS is described for generating Landslide Hazard Zonation and to identify the weaker zones in Mechuka valley in the West Siang district of Arunachal Pradesh. Remote Sensed images are combined in the GIS environment with other spatial factors which influences the occurrence of Landslides. Important terrain factors having an influence on the Landslide occurrence are identified and corresponding thematic layers are generated. These layers include DEM, Slope angle and direction, Lineaments, Drainage, Geomorphology, Landuse/Landcover, Topographic Wetness index and Stream power index. Analytical Hierarchy Process (AHP) modelling is used to assign weightage to the causative factors. Layers are first divided into classes for assigning the ratings and weighted are assigned to the factors on the basis of their influence on landslide occurrence. LHZ map of the study area is generated after assigning the weightages.