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| Titel |
Rockfall travel distance analysis by using empirical models (Solà d'Andorra la Vella, Central Pyrenees) |
| VerfasserIn |
R. Copons, J. M. Vilaplana, R. Linares |
| 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 ; 9, no. 6 ; Nr. 9, no. 6 (2009-12-14), S.2107-2118 |
| Datensatznummer |
250007076
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| Publikation (Nr.) |
 copernicus.org/nhess-9-2107-2009.pdf |
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| Zusammenfassung |
| The prediction of rockfall travel distance below a rock cliff is an
indispensable activity in rockfall susceptibility, hazard and risk
assessment. Although the size of the detached rock mass may differ
considerably at each specific rock cliff, small rockfall (<100 m3) is
the most frequent process. Empirical models may provide us with suitable
information for predicting the travel distance of small rockfalls over an
extensive area at a medium scale (1:100 000–1:25 000). "Solà
d'Andorra la Vella" is a rocky slope located close to the town of Andorra
la Vella, where the government has been documenting rockfalls since 1999.
This documentation consists in mapping the release point and the individual
fallen blocks immediately after the event. The documentation of historical
rockfalls by morphological analysis, eye-witness accounts and historical
images serve to increase available information. In total, data from twenty
small rockfalls have been gathered which reveal an amount of a hundred
individual fallen rock blocks. The data acquired has been used to check the
reliability of the main empirical models widely adopted (reach and shadow
angle models) and to analyse the influence of parameters which affecting the
travel distance (rockfall size, height of fall along the rock cliff and
volume of the individual fallen rock block). For predicting travel distances
in maps with medium scales, a method has been proposed based on the "reach
probability" concept. The accuracy of results has been tested from the line
entailing the farthest fallen boulders which represents the maximum travel
distance of past rockfalls. The paper concludes with a discussion of the
application of both empirical models to other study areas. |
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