Determination of avalanche dynamics friction coefficients from measured speeds

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TypeArticle
Journal titleAnnals of Glaciology
ISSN0260-3055
Volume4
Pages17073; # of pages: 98
Subjectavalanches; friction; speed; mathematical models; avalanche dynamics model limitations, properties and suggested use
AbstractAn avalanche dynamics model, appropriate for complex terrain, for real avalanche paths was developed by Perla, Cheng and McClung in 1980. The model has two friction terms, one for sliding friction which is independent of speed, and one for turbulent friction which is proportional to V[2], where V is the centre-of-mass speed along the incline. By introducing speed maxima for avalanches, along with start and stop reference positions, it is possible to determine the two constant friction coefficients for the model. When this is done, it is found that speed data often exceed a model speed limit implied by the application of V = 0 at the start and stop positions. This effect is illustrated by analytic solutions of the relevant equations, as well as numerical solutions for actual avalanche paths. Some limitations and properties of the fundamental modelling are outlined and suggestions given for future use of such models.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1138
NRC number22701
121
NPARC number20378955
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Record identifier05bf055c-9998-424e-86da-c23ba5873602
Record created2012-07-24
Record modified2016-05-09
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