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| Titel |
Magnitude-frequency of sea cliff instabilities |
| VerfasserIn |
F. M. S. F. Marques |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2008-10-22), S.1161-1171 |
| Datensatznummer |
250005778
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1161-2008.pdf |
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| Zusammenfassung |
| The magnitude-frequency relationship of sea cliff failures in strong, low
retreat rate cliffs, was studied using systematic historical inventories
carried out in the coasts of Portugal and Morocco, in different geological
and geomorphological settings, covering a wide size scale, from small to
comparatively large rockslides, topples and rockfalls, at different time and
spatial scales. The magnitude-frequency expressed in terms of volume
displaced and of horizontal area lost at the cliff top showed good fit by
inverse power laws of the type p=a.x−b, with a values from 0.2 to 0.3,
and exponents b close to 1.0, similar to those proposed for rockfall
inventories. The proposed power laws address the magnitude-frequency for sea
cliff failures, which is an important component of hazard assessment, to be
completed with adequate models for space and time hazard components. Maximum
local retreat at the cliff top provided acceptable fitting to inverse power
laws only for failures wider than 2m, with a = 4.0, and exponent b = 2.3, which
may be useful to assess the cliff retreat hazard for the use of areas
located near the cliff top. |
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