Landslide susceptibility assessment using three bivariate models considering the new topo-hydrological factor: HAND |
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Authors: | Aiding Kornejady Majid Ownegh Omid Rahmati Abdolreza Bahremand |
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Institution: | 1. Department of Watershed Management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iranaidin.kornejady@gmail.com;3. Department of Arid Zone Management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran;4. Faculty of Agriculture, Department of Watershed Management, Lorestan University, Khorramabad, Iran;5. Department of Watershed Management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran |
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Abstract: | AbstractThe main objective of this study is to assess the relative contribution of the state-of-the-art topo-hydrological factor, known as height above the nearest drainage (HAND), to landslide susceptibility modellling using three novel statistical models: weights-of-evidence (WofE), index of entropy and certainty factor. In total, 12 landslide conditioning factors that affect the landslide incidence were used as input to the models in the Ziarat Watershed, Golestan Province, Iran. Landslide inventory was randomly divided into a ratio of 70:30 for training and validating the results of the models. The optimum combination of conditioning factors was identified using the principal components analysis (PCA) method. The results demonstrated that HAND is the defining factor among hydrological and topographical factors in the study area. Additionally, the WofE model had the highest prediction capability (AUPRC = 74.31%). Therefore, HAND was found to be a promising factor for landslide susceptibility mapping. |
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Keywords: | Weight of evidence Index of entropy certainty factor empirical conditional probability Iran |
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