Landslide consequence analysis: a region-scale indicator-based methodology

• Published in: Landslides Vol. 11; no. 5; pp. 843 - 858
• Main Authors: Puissant, A., Van Den Eeckhaut, M., Malet, J.-P., Maquaire, O.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2014; Springer Nature B.V; Springer Verlag
• Series: Landslides
• Subjects: Agriculture; Alps; Civil Engineering; Damage; Data analysis; Earth and Environmental Science; Earth Sciences; Economic impact; Environmental risk; Estimating; Exposure; Geography; Geological hazards; Hazards; Humanities and Social Sciences; Land use; Landslides; Landslides & mudslides; Methodology; Natural Hazards; Original Paper; Risk; Risk assessment; France, Alps Mts; Socio-economic impacts; Direct and indirect consequences; Landslide; Physical injury; Structural and function impacts; Damage index; structural and fonction impacts; direct and indirect consequences; socio-economics impacts; damage index; physical in jury
• ISSN: 1612-510X; 1612-5118
• DOI: 10.1007/s10346-013-0429-x

Consequence analysis is, together with hazard evaluation, one of the major steps of landslide risk assessment. However, a significant discrepancy exists between the number of published landslide hazard and landslide consequence studies. While various methodologies for regional-scale hazard assessment have been developed during the last decade, studies for estimating and visualising possible landslide consequences are still limited, and those existing are often difficult to apply in practice mainly because of the lack of data on the historical damage or on landslide damage functions. In this paper, an indicator-based GIS-aided methodology is proposed with an application to regional-scale consequence analysis. The index, called Potential Damage Index, allows describing, quantifying, valuing, totalizing and visualising different types of consequences. The method allows estimating the possible damage caused by landslides by combining weighted indicators reflecting the exposure of the elements at risk. Direct (physical injury, and structural and functional damage) and indirect (socio-economic impacts) consequences are individually analysed and subsequently combined to obtain a map of total consequences due to landsliding. Geographic visualisation of the index allows the delineation of the areas exposed to any type of possible impacts that could be combined with a corresponding map displaying landslide probability of occurrence. The method has been successfully applied to analyse the present consequences in the Barcelonnette Basin (South French Alps). These maps contribute to development of adequate land use and evacuation plans, and thus are important tools for local authorities and insurance companies.