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| Titel |
Sea cliff instability susceptibility at regional scale: a statistically based assessment in the southern Algarve, Portugal |
| VerfasserIn |
F. M. S. F. Marques, R. Matildes, P. Redweik |
| 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 ; 13, no. 12 ; Nr. 13, no. 12 (2013-12-09), S.3185-3203 |
| Datensatznummer |
250085578
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| Publikation (Nr.) |
 copernicus.org/nhess-13-3185-2013.pdf |
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| Zusammenfassung |
Sea cliff evolution is dominated by the occurrence of slope mass movements of
different types and sizes, which are a considerable source of natural hazard,
making their assessment a relevant issue in terms of human loss prevention
and land use regulations. To address the assessment of the spatial component
of sea cliff hazards, i.e. the susceptibility, a statistically based study
was made to assess the capacity of a set of conditioning factors to express
the occurrence of sea cliff failures affecting areas located along their top.
The study was based on the application of the bivariate information value and
multivariate logistic regression statistical methods, using a set of
predisposing factors for cliff failures, mainly related to geology
(lithology, bedding dip, faults) and geomorphology (maximum and mean slope,
height, aspect, plan curvature, toe protection), which were correlated with a
photogrammetry-based inventory of cliff failures that occurred in a 60 yr
period (1947–2007). The susceptibility models were validated against the
inventory data using standard success rate and ROC curves, and provided
encouraging results, indicating that the proposed approaches are effective
for susceptibility assessment. The results obtained also stress the need for
improvement of the predisposing factors to be used in this type of study and
the need for detailed and systematic cliff failure inventories. |
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