Abstract
The disastrous phenomena of landslide is known as downward and outward movement of the materials forming the slope under the influence of gravitational forces as well as human interference. The state of Himachal Pradesh, India often gets disrupted due to monsoonal rainfall triggered mass movements in the form of debris flows, slides, falls, etc. from the past three decades. To assess the loss of life and property because of landslide activities in the region through hazard zonation mapping is an important task which is helpful for future developmental and constructional activities along the transport road corridors. Road section from Lahru up to Chamba district headquarters via Banikhet in Chamba, Himachal Pradesh was chosen for landslide hazard zonation mapping in the present study based on the numerous landslide causative factors in the form of thematic maps delineated through ArcGIS. The raster and vector type of datasets were collected from the available sources for the software analysis. In addition to this, desk and field investigations were performed for selecting the study area and to collect landslide related information from various departments and the local public in the region. The certainty factor approach was adopted for delineating landslide hazard zonation map of the study area to categorize the map into five hazard zones. Depending upon the severity, landslide hazard map (LHZ) was further divided into five different categories like very low (17%), low (27%), moderate (26%), high (20%), and very high (10%). The accuracy of the hazard zonation map was evaluated using the area under the curve method. This map will be helpful for various stakeholders like geologists, geo-technicians, engineers, Public Works Department for future development along the selected road corridor to mitigate landslide geohazard activities.
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