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| Titel |
Rockfall hazard and risk assessments along roads at a regional scale: example in Swiss Alps |
| VerfasserIn |
C. Michoud, M.-H. Derron, P. Horton, M. Jaboyedoff, F.-J. Baillifard, A. Loye, P. Nicolet, A. Pedrazzini, A. Queyrel |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2012-03-14), S.615-629 |
| Datensatznummer |
250010606
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| Publikation (Nr.) |
 copernicus.org/nhess-12-615-2012.pdf |
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| Zusammenfassung |
| Unlike fragmental rockfall runout assessments, there are only few robust
methods to quantify rock-mass-failure susceptibilities at regional scale. A
detailed slope angle analysis of recent Digital Elevation Models (DEM) can be used to detect
potential rockfall source areas, thanks to the Slope Angle Distribution procedure. However, this
method does not provide any information on block-release frequencies inside
identified areas. The present paper adds to the Slope Angle Distribution of cliffs unit its normalized cumulative distribution function. This
improvement is assimilated to a quantitative weighting of slope angles,
introducing rock-mass-failure susceptibilities inside rockfall source areas
previously detected. Then rockfall runout assessment is performed using the
GIS- and process-based software Flow-R, providing relative frequencies for runout.
Thus, taking into consideration both susceptibility results, this approach
can be used to establish, after calibration, hazard and risk maps at
regional scale. As an example, a risk analysis of vehicle traffic exposed
to rockfalls is performed along the main roads of the Swiss alpine valley of
Bagnes. |
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