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(Article of periodic en Anglais - 2011)

Document title

Unraveling driving factors for large rock–ice avalanche mobility

Authors(s) and Affiliation(s)

SCHNEIDER D. (1) ; HUGGEL C. (1) ; HAEBERLI W. (1) ; KAITNA R. (2) ;
(1) Dep. of Geology, univ., Zurich, SUISSE
(2) Inst. of Mountain Risk Engineering, Univ. of Natural Resources and Life Sciences (BOKU), Vienna, AUTRICHE

Abstract

This contribution is an attempt to unravel driving factors for the mobility of large rock-ice avalanches by synthesizing results from physical laboratory experiments and empirical data from 64 rock-ice avalanches from glacierized high mountain regions around the world. The influence of avalanche volume, water and ice content, low-friction surfaces, and topography on the apparent coefficient of friction (as a measure of mobility) is assessed. Besides liquefaction, it was confirmed that mobility increases with volumes and that frictional surface characteristics such as flow paths over glaciers are also dominant variables determining mass movement mobility. Effects of the topography along the flow path as well as channeling are assumed to be other critical factors. The results provide an empirical basis to roughly account for different path and flow characteristics of large rock-ice avalanches and to find appropriate ranges for friction parameters for scenario modeling and hazard assessments

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2011, vol. 36, no14 [pp. 1948-1966]

Bibliographic references : 3 p.

Collation : 12 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2218

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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