Geographia Technica, Vol 12, Issue no. 2/2017, pp. 97-109
LANDSLIDE SUSCEPTIBILITY ASSESSMENT IN ALMAS BASIN BY MEANS OF THE FREQUENCY RATE AND GIS TECHNIQUES
Ioan-Aurel IRIMUȘ, Sanda ROȘCA, Mădălina-Ioana RUS, Flavia Luana MARIAN, Ștefan BILAȘCO
ABSTRACT: Landslides alongside the erosion are part of the geomorphological processes, specific of Romanian territory, that require agricultural land management issues and processes that lead to increased risk and damage on the population, housing and transport infrastructure. Almaș hydrographic basin, situated in North-West side of Romania, in Almaș - Agrij Depression, is strongly affected by landslides. The purpose of this study is to assess the landslide susceptibility by using the calculation pattern of landslide frequency rate and of the susceptibility index, by means of GIS techniques. Therefore, four groups of landslide susceptibility have been identified: very low, low, moderated and high. The results indicate that 60,36% of the study area is moderately and highly susceptible to landslides. Emphasis was placed in this study both on identifying spatial susceptibility to landslides, but also on the analysis of causal and releaser factors and on the individual and cumulated influence on the apparition probability so needed in order to make predictions. In order to validate the obtained results, the area under the ROC curve was calculated, whose value of 0.895 indicates the degree of representativeness of the model for the analyzed territory.
Keywords: Landslide, Frequency rate, AUROC, GIS modelling.
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