Home Articles GIS-based data integration for landslide hazard zonation in the Garhwal Himalayas

GIS-based data integration for landslide hazard zonation in the Garhwal Himalayas

A. K. Saha1, R. P. Gupta1 and M. K. Arora2
1Department of Earth Sciences, University of Roorkee, Roorkee – 247 667
2Department of Civil Engineering, University of Roorkee, Roorkee – 247 667

Landslides lead to serious problem in the hilly regions causing loss of life and property and damage to natural resources. Landslide Hazard Zonation helps making strategic planning for the future developmental activities in areas prone to landslides. In this study a methodology has been developed using integrated GIS for Landslide Hazard Zonation. A 60-km stretch in the Bhagirathi Valley has been selected for this study. IRS-1B multispectral LISS II, IRS-1D PAN data, topographic map, geological and structural map and field data have been utilized to generate various thematic data layers, viz., thrusts and photo-lineaments, lithology, landuse/landcover map, drainage, slope angle map and relative relief map. All these data layers have been integrated using ordinal scale qualitative weighting-rating system based on evaluation of various parameters in a raster GIS. to compute Landslide Hazard Index (LHI). The LHI frequency diagram has been studied and used to subdivide the area into five landslide hazard zones: very low, low, moderate, high and very high. A landslide distribution map has been prepared from field observation and interpretation of IRS PAN images. These data layer has been used to evaluate the validity of Landslide Hazard Zonation map.