Stochastic landslide vulnerability modeling in space and time in a part of the northern Himalayas, India

• Published in: Environmental monitoring and assessment Vol. 178; no. 1-4; pp. 25 - 37
• Main Authors: Das, Iswar, Kumar, Gaurav, Stein, Alfred, Bagchi, Arunabha, Dadhwal, Vinay K.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.07.2011; Springer; Springer Nature B.V
• Subjects: Assessments; Atmospheric Protection/Air Quality Control/Air Pollution; Buildings; Disasters - statistics & numerical data; Earth and Environmental Science; Earth sciences; Earth, ocean, space; Earthquakes; Ecology; Ecotoxicology; Engineering and environment geology. Geothermics; Environment; Environmental Management; Environmental monitoring; Environmental risk; Exact sciences and technology; Geological hazards; Humans; India; Landslides; Landslides & mudslides; Landslides - statistics & numerical data; Marine and continental quaternary; Models, Statistical; Monitoring/Environmental Analysis; Natural hazards: prediction, damages, etc; Population; Random variables; Risk; Risk analysis; Risk Assessment; Roads; Roads & highways; Stochastic models; Stochastic Processes; Stochasticity; Storm damage; Structure Collapse - statistics & numerical data; Surficial geology; Traffic flow; Vehicles; Asia; Himalayas; India; Pakistan, Himalayas; Landslide; Elements at risk; Stochastic vulnerability; India; risk assessment; stochastic models; landslides; roads; vulnerability; communities
• ISSN: 0167-6369; 1573-2959
• DOI: 10.1007/s10661-010-1668-0

Little is known about the quantitative vulnerability analysis to landslides as not many attempts have been made to assess it comprehensively. This study assesses the spatio-temporal vulnerability of elements at risk to landslides in a stochastic framework. The study includes buildings, persons inside buildings, and traffic as elements at risk to landslides. Building vulnerability is the expected damage and depends on the position of a building with respect to the landslide hazard at a given time. Population and vehicle vulnerability are the expected death toll in a building and vehicle damage in space and time respectively. The study was carried out in a road corridor in the Indian Himalayas that is highly susceptible to landslides. Results showed that 26% of the buildings fall in the high and very high vulnerability categories. Population vulnerability inside buildings showed a value >0.75 during 0800 to 1000 hours and 1600 to 1800 hours in more buildings that other times of the day. It was also observed in the study region that the vulnerability of vehicle is above 0.6 in half of the road stretches during 0800 hours to 1000 hours and 1600 to 1800 hours due to high traffic density on the road section. From this study, we conclude that the vulnerability of an element at risk to landslide is a space and time event, and can be quantified using stochastic modeling. Therefore, the stochastic vulnerability modeling forms the basis for a quantitative landslide risk analysis and assessment.