|
|
|
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.
|
|
|