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| Titel |
Integrating rockfall risk assessment and countermeasure design by 3D modelling techniques |
| VerfasserIn |
F. Agliardi, G. B. Crosta, P. Frattini |
| 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. 4 ; Nr. 9, no. 4 (2009-07-06), S.1059-1073 |
| Datensatznummer |
250006871
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1059-2009.pdf |
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| Zusammenfassung |
| Rockfall risk analysis for mitigation action design requires evaluating the
probability of rockfall events, the spatial probability and intensity of
impacts on structures, their vulnerability, and the related expected costs
for different scenarios. These tasks were integrated in a quantitative risk
assessment procedure supported by 3D rockfall numerical modelling performed
by the original code HY-STONE. The case study of Fiumelatte (Varenna,
Italy), where a large rockfall in November 2004 resulted in 2 casualties,
destruction of several buildings and damage to transportation corridors, is
discussed. The numerical model was calibrated by a back analysis of the 2004
event, and then run for the whole area at risk by considering scenarios
without protection (S0), with a provisional embankment (S1), and with a
series of long-term protection embankments (S2). Computed impact energy and
observed damage for each building impacted in 2004 were combined to
establish an empirical vulnerability function, according to which the
expected degree of loss for each element at risk was computed. Finally,
costs and benefits associated to different protection scenarios were
estimated, in order to assess both the technical performance and the cost
efficiency of different mitigation options. |
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