LANDSLIDE HAZARD ZONATION OF TEHRI GARHWAL DISTRICT, UTTARAKHAND

Abstract

As we know landslide is a natural phenomenon as well as extremely catastrophic natural hazard. It has a potential to damage any natural landscape, road, railway track, human life, and property. India has many landslide prone states wherein with each passing day, an increase in the population of the country has become a concern for landslide. A larger part of Uttarakhand is already affected by the landslide. This makes it compulsory for us to have a proactive approach for the prevention from landslide rather than waiting for a disaster to occur (NDMA, 2009). To quantify the susceptibility of landslide, the Central Building Research Institute (CBRI), Roorkee uses Landslide Susceptibility Score (LSS), while Bureau of Indian Standards (BIS 14496 Part 2) for uses Landslide Hazard Evaluation Factor (LHEF). Once the problem of landslide is quantified, various decision regarding planning and mitigation can be made in a more logical and systematic manner. In respect to that, a Landslide Inventory of the Tehri Garhwal District of Uttarakhand was created, along with it various causative factors such as slope, curvature, aspect, geology, drainage etc. were studied. The various methods employed for hazard zonation were studied thoroughly and Overlay method was employed to give weightage to the various causative factors. Finally GIS (Geographic Information System) was used for the analysis and display of the result