IJSR - International Journal of Scientific Research

Malathi .V.

Volume : VI, Issue : XI, November - 2017

Landslide Hazard Zonation And Validation In The Hilly Terrains Of Nilgiris District Using Remote Sensing And Geographical Information System

Malathi . V.

Abstract :

Landslides are defined by professionals like Engineers and Geologists in a unique and different way. The important factors responsible for the landslides area were assigned numerical values or ranks on a 1 to 5 scale in order of importance. Weights were assigned to the classes of the factors on a scale of 1– 100 percent influence. All the thematic maps were ranked before overlaying. The Landslide Hazard Zonation map was determined for different categories of the thematic layers on the basis of the estimated significance in causing instability. In the present study, weighted indexing method has been used to demarcate the landslide hazard zones. The classes with higher values indicate the Most Hazardous zones, followed by More Hazardous zones, followed by Moderately Hazardous zones and Less Hazardous zones and Very less Hazardous zones. Validation was done by the frequency ratio of the each of the factors slope, drainage density, soil, Lithology, geomorphology and land use/ land cover for landslide hazard zonation with the percentage occurrences of landslides