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| Titel |
Landslide susceptibility assessment considering landslide typology. A case study in the area north of Lisbon (Portugal) |
| VerfasserIn |
J. L. Zêzere |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 2, no. 1/2 ; Nr. 2, no. 1/2, S.73-82 |
| Datensatznummer |
250000267
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| Publikation (Nr.) |
 copernicus.org/nhess-2-73-2002.pdf |
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| Zusammenfassung |
| 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. |
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