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Generation of a national landslide hazard and risk map for the country of Georgia

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Abstract

Landslide risk assessment for large areas at a country level requires a different approach and data than what is standard practice at large scales. The main goal of this research was to design a methodology for a nationwide landslide risk assessment for Georgia taking into account the limitations in data availability and detail, which do not allow the use of physically based models or statistical methods. Given these limitations, we decided to generate a qualitative landslide risk index using spatial multicriteria evaluation (SMCE). An attempt was made to compile a national landslide inventory, using old and partly destroyed archives from the Soviet period, combined with information from annual field surveys. A web-based interface for the reporting of landslide events was developed to improve the updating of the inventory in future. Relevant factor maps were prepared for the entire country, partly based on remote sensing data. As the available landslide inventory was not sufficient to use statistical methods, the factor maps were weighted using the expert-based SMCE method, and the resulting susceptibility map was validated using the available landslide inventory. The inventory was also used to make an estimation of the spatial probability of landslide occurrence within the various susceptibility classes. The resulting map was used in combination with element-at-risk maps to calculate exposure maps and to make a tentative assessment of the expected landslide losses in a 50-year time period .

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Acknowledgments

The authors would like to thank the National Environmental Agency of the Ministry of Environment and Natural Resources Protection of Georgia, CENN for providing various datasets used in this study and colleagues from the MATRA Project: Nana Janashia (CENN), Dr. M. W. (Menno) Straatsma, Dr. Ulan Turdukulov, W.F. (Wim) Feringa (ITC), Koert Sijmons (GeoMapa), Kakha Bakhtadze, Tchichiko Janelidze, Nino Kheladze, Levan Natsvlishvili (CENN) for their collaboration.

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Authors and Affiliations

  1. Department of Geology, Ministry of Environment and Natural Resources Protection of Georgia, National Environmental Agency, 0112, Tbilisi, Georgia

    George Gaprindashvili

  2. Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, 7500 AE, Enschede, The Netherlands

    Cees J. Van Westen

  3. Institute of Geography, Ivane Javakhishvili Tbilisi State University, 0179, Tbilisi, Georgia

    George Gaprindashvili

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  1. George Gaprindashvili
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Correspondence to George Gaprindashvili.

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Gaprindashvili, G., Van Westen, C.J. Generation of a national landslide hazard and risk map for the country of Georgia. Nat Hazards 80, 69–101 (2016). https://doi.org/10.1007/s11069-015-1958-5

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