Rockfall hazard and risk assessments along roads at a regional scale: Example in Swiss Alps

Détails

ID Serval
serval:BIB_13332234CFC7
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Rockfall hazard and risk assessments along roads at a regional scale: Example in Swiss Alps
Périodique
Natural Hazards and Earth System Science
Auteur(s)
Michoud C., Derron M.-H., Horton P., Jaboyedoff M., Baillifard F.-J., Loye A., Nicolet P., Pedrazzini A., Queyrel A.
ISSN-L
1561-8633
Statut éditorial
Publié
Date de publication
2012
Peer-reviewed
Oui
Volume
12
Pages
615-629
Langue
anglais
Notes
Michoud2012a
Résumé
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.
Mots-clé
landslide susceptibility, elevation models, runout zones, hard-rock, frequency, slopes
Open Access
Oui
Création de la notice
25/11/2013 16:26
Dernière modification de la notice
20/08/2019 12:41
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