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Landslide susceptibility assessment considering landslide typology: a case study in the area north of Lisbon (Portugal)
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Resumo(s)
The aim of the study is to confirm the importance
of discriminate different types of slope movements for a better landslide susceptibility evaluation. The study was applied
to the sample area of Calhandriz (11.3 km2
) in the area North
of Lisbon. Sixty shallow translational slides, 23 deeper translational movements and 19 rotational movements were selected for statistical analysis. Landslide susceptibility assessment was achieved using a data-driven approach: the Information Value Method (Yin and Yan, 1988). The method was
applied both to the total set of considered landslides and to
each type of slope movement, and the obtained success rates
for the highest susceptibility classes are higher in the latter
case. The different types of landslides are not equally conditioned by the considered instability factors. Information
scores are higher for lithology, concordance between slope
aspect and dip of the strata, and slope angle, respectively, for
rotational movements, translational movements and shallow
translational slides.
The information value of the variables “presence of artificial cut (roads)” and “presence of fluvial channel” is systematically high for the three types of slope movement, pointing
out the importance of both anthropogenic influence and bank
erosion on slope instability in the study area.
Different types of landslides have neither the same magnitude nor equal damaging potential. Furthermore, technical
strategies to mitigate landsliding also depend on landslide typology. These are additional reasons to discriminate between
different types of slope movements when assessing landslide
susceptibility and hazard.
Descrição
Palavras-chave
Landslide susceptibility Landslide typology North of Lisbon Portugal
Contexto Educativo
Citação
Zezere, J. L. (2002). Landslide susceptibility assessment considering landslide typology: a case study in the area north of Lisbon (Portugal). Natural Hazards and Earth System Sciences, 2(1–2), 73–82. https://doi.org/10.5194/nhess-2-73-2002.
Editora
Copernicus Publications