Effect of using various weighting methods in a process of landslide susceptibility assessment
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Effect of using various weighting methods in a process of landslide susceptibility assessment Kamila Hodasová1 · Martin Bednarik2 Received: 19 June 2020 / Accepted: 11 September 2020 © Springer Nature B.V. 2020
Abstract This study discusses the evaluation of the effect of using different weighting approaches in the process of landslide susceptibility assessment. Weighting process is needed, especially for landslide susceptibility assessment using bivariate statistical analysis, and can radically affect the resulting susceptibility map. The bivariate analysis belongs to a set of quantitative methods. The initial point for the bivariate analysis is selection and processing of input factors in the form of parametric maps, factors that play a dominant role in slope stability. The parametric maps were subsequently evaluated related to landslide inventory map. Another essential part of the bivariate analysis is the determination of the weight of the given input factors. Herein, four methods were applied to determine the weights of each class within reclassified input factors, as well as the total weight of the individual input factors. As a study area, the district of Kysucké Nové Mesto in Slovakia was chosen. Four prognostic maps were the result using entropy index, AHP method (AHP—analytic hierarchy process) (the input factors weighted as a whole), frequency ratio and landslide index (the weights were calculated for each class of input factor). Final landslide susceptibility maps were verified trough ROC curves (ROC—receiver operating characteristics). The accuracy of maps was ascertained by the size area (AUC—area under curve) under ROC curve. The highest accuracy was obtained for maps using weights calculated from the landslide index (88.5%) and the frequency ratio (88.4%). Keywords Bivariate statistical analysis · Entropy index · AHP · Frequency ratio · Landslide index · Prognostic maps
* Martin Bednarik [email protected] Kamila Hodasová [email protected] 1
Department of Hydrogeology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovak Republic
2
Department of Engineering Geology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovak Republic
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Natural Hazards
1 Introduction Landslides are an unwanted natural phenomenon which threaten the lives of humans, complicate the completion of construction and threaten existing buildings, which were built without consideration of the geological conditions around them. In these conditions, where landslides are present, it must be observed in all qualitative requirements resulting from the future usage of the building, which is associated with increased demands on the foundations, possibly on the remediation measures. The elimination of problems associated with landslides can be achieved by creating susceptibility maps, which define the area based on a susceptibility degree of landsliding. Such maps would, therefore, enable the possibility of preventing an incorrect choice of locat
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