Abstract
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.
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Acknowledgments
This study has been carried out in the framework of the EU-FP6 Marie Curie Research and Training Network ‘Mountain Risks: from prediction to management and governance’ (grant agreement MCITN-35298) and the EU-FP7 project SafeLand ‘Living with landslide risk in Europe: Assessment, effects of global change, and risk management strategies’ (grant agreement 226479). The authors thank everybody that contributed to the collection of the information stored in the elements at risk database, and the staff of the ONF-RTM Service of Department Alpes-de-Haute-Provence for regular discussion meetings on the conceptual approach and the assignment of the index value.
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Puissant, A., Van Den Eeckhaut, M., Malet, JP. et al. Landslide consequence analysis: a region-scale indicator-based methodology. Landslides 11, 843–858 (2014). https://doi.org/10.1007/s10346-013-0429-x
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DOI: https://doi.org/10.1007/s10346-013-0429-x