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| Titel |
A methodology for physically based rockfall hazard assessment |
| VerfasserIn |
G. B. Crosta, F. Agliardi |
| 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 ; 3, no. 5 ; Nr. 3, no. 5, S.407-422 |
| Datensatznummer |
250001238
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| Publikation (Nr.) |
 copernicus.org/nhess-3-407-2003.pdf |
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| Zusammenfassung |
| Rockfall hazard assessment is not
simple to achieve in practice and sound, physically based assessment
methodologies are still missing. The mobility of rockfalls implies a more
difficult hazard definition with respect to other slope instabilities with
minimal runout. Rockfall hazard assessment involves complex definitions
for "occurrence probability" and "intensity". This
paper is an attempt to evaluate rockfall hazard using the results of 3-D
numerical modelling on a topography described by a DEM. Maps portraying
the maximum frequency of passages, velocity and height of blocks at each
model cell, are easily combined in a GIS in order to produce physically
based rockfall hazard maps. Different methods are suggested and discussed
for rockfall hazard mapping at a regional and local scale both along
linear features or within exposed areas. An objective approach based on
three-dimensional matrixes providing both a positional "Rockfall
Hazard Index" and a "Rockfall Hazard Vector" is presented.
The opportunity of combining different parameters in the 3-D matrixes has
been evaluated to better express the relative increase in hazard.
Furthermore, the sensitivity of the hazard index with respect to the
included variables and their combinations is preliminarily discussed in
order to constrain as objective as possible assessment criteria. |
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