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TitleFragility curves for assessing the risks of debris flow hazards
AuthorPrieto, J A; Journeay, J M
SourceCanadian Risk and Hazards Network, 9th annual symposium, symposium abstracts; by CRHNet; 2012 p. 39
LinksCRHNet 2012 Symposium presentation
LinksHazus Canada
Alt SeriesEarth Sciences Sector, Contribution Series 20120125
MeetingCanadian Risk and Hazards Network Symposium 2012; Vancouver; CA; October 24-26, 2012
Mediapaper; on-line
File formatpdf
Subjectssurficial geology/geomorphology; debris flows; modelling; fragility curves
Illustrationscharts; photographs
ProgramQuantitative risk assessment, Public Safety Geoscience
AbstractQuantitative risk assessment methods for debris flow hazards are increasingly used as the basis for disaster mitigation planning in mountainous terrain. Current methods of risk assessment are based on empirical models that relate the depth of debris flow materials at a specific location to an expected level of proportional economic loss. A more rigorous model based on principles of physical vulnerability has recently been developed that utilizes the overall intensity of a debris flow at a specific location (Intensity = depth x flow velocity2) to estimate the probable state of physical damage to common building types at the point of impact. This study extends the capabilities of the physical vulnerability model by introducing a set of corresponding fragility curves that can be used to estimate the probabilities of exceeding specific states of building damage over a continuous range of debris flow intensities. The debris flow fragility curves framework are consistent with those developed for quantitative risk assessment of earthquake, flood and hurricane hazards, and have the potential to be incorporated into standardized loss estimation methods like HAZUS that are used to support disaster mitigation planning and land use decision making at local and regional scales.