Abstract
The purpose of this study is to evaluate and to compare the results of multivariate (logical regression) and bivariate (landslide susceptibility) methods in Geographical Information System (GIS) based landslide susceptibility assessment procedures. In order to achieve this goal the Asarsuyu catchment in NW Turkey was selected as a test zone because of its well-known landslide occurrences interfering with the E-5 highway mountain pass.
Two methods were applied to the test zone and two separate susceptibility maps were produced. Following this a two-fold comparison scheme was implemented. Both methods were compared by the Seed Cell Area Indexes (SCAI) and by the spatial locations of the resultant susceptibility pixels.
It was found that both of the methods converge in 80% of the area; however, the weighting algorithm in the bivariate technique (landslide susceptibility method) had some severe deficiencies, as the resultant hazard classes in overweighed areas did not converge with the factual landslide inventory map. The result of the multivariate technique (logical regression) was more sensitive to the different local features of the test zone and it resulted in more accurate and homogeneous susceptibility maps.
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Acknowledgements
This study was financially supported by the Middle East Technical University Research Project No: AFP-99–03–09–04.
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Süzen, M.L., Doyuran, V. A comparison of the GIS based landslide susceptibility assessment methods: multivariate versus bivariate. Env Geol 45, 665–679 (2004). https://doi.org/10.1007/s00254-003-0917-8
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DOI: https://doi.org/10.1007/s00254-003-0917-8