Abstract

PIEDADE, Aldina; ZEZERE, José Luís; GARCIA, Ricardo A. C  and  OLIVEIRA, Sérgio C. Susceptibility models for shallow translational slides. Evaluation and mapping in the region to the north of Lisbon. Finisterra [online]. 2011, n.91, pp.9-26. ISSN 0430-5027.

Over the last decade, Geographic information systems (GIS) have enabled the creation and the rigorous crossing and computation of cartographic thematic layers. Thus, it has been possible to increase the number of variables within data-driven landslide susceptibility models. In this context, sensitivity analysis is an analytical tool used to assess the relative importance of the landslide predisposing factors into a particular landslide susceptibility model. In this study, a sensitivity analysis of shallow translational slides susceptibility models is made for two test sites in the region to the north of Lisbon, which have the same geologic and geomorphologic context: the Fanhões-Trancão test site and the Lousa-Loures test site. The results obtained allowed for the identification of 3 variables that have the highest spatial association with shallow translational slides in both test sites: slope angle, geomorphology and slope aspect. Furthermore, results prove the absence of a linear relationship between the number of variables within a landslide predictive model and the model prediction capacity. In addition to this, it is shown that reliable landside susceptibility maps can be produced based on a small group of variables that have a strong spatial relationship with slope movements

Keywords : Susceptibility; Shallow Translational Slides; Predisposing Factors; Sensitivity Analysis.

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