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| Titel |
Catastrophic glacial multi-phase mass movements: a special type of glacial hazard |
| VerfasserIn |
D. A. Petrakov, S. S. Chernomorets, S. G. Evans, O. V. Tutubalina |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 2nd EGU Alexander von Humboldt Conference "The role of Geophysics in Natural Disaster Prevention" ; Nr. 14 (2008-04-10), S.211-218 |
| Datensatznummer |
250012104
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| Publikation (Nr.) |
 copernicus.org/adgeo-14-211-2008.pdf |
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| Zusammenfassung |
| Many glacier-related hazards are well typified and studied, but some events
stand out from conventional classifications. The Kolka-Karmadon
catastrophic event on 20 September 2002 in North Ossetia, North Caucasus,
Russia is used as an example of a complex glacier failure exhibiting
characteristics such as high mobility, long runout, ultrarapid movement and
multiphase behaviour. We consider terminology protocol for glacier hazard
classification and then, using the Kolka-Karmadon event and several other
examples from around the world, we propose a new term for this family of
events. Catastrophic glacier multi-phase mass movement (CGMM) is described
and further illustrated by eight major events from Russia, Georgia, Peru,
Chile, and Canada. CGMM have a combination of specific features:
extraordinary velocities and long-distance runout despite low path angle;
progressive fluidisation along travel path; superelevation and run-up of the moving
mass, air blast wave in the avalanche flow phase; entrainment of available
materials in its path, and the repeated nature of the event. CGMM events may
affect areas remote from glaciers which were previously considered as safe. |
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