Item: Head formation in light granular avalanches
Title: Head formation in light granular avalanches
Proceedings: Proceedings of the 1996 International Snow Science Workshop, Banff, Canada
Authors: Yasuaki Nohguch and Koiti Nishimural, Nagaoka Institute of Snow and Ice Studies, Suyoshi, Nagaoka, 940 Japan, :el:+81-258-7522, Fax:+81-258-0020, e-mail:firstname.lastname@example.orgLgo.jp, Institute of Low Temperature Science, Hokkaido University, Sapporo, 060 J
Abstract: A sufficiently developed natural avalanche always has a head at the front end and a tail at the rear end. To experimentally simulate avalanches with such a head-tail structure, avalanche experiments were carried out using table tennis balls, golfballs and styrene foam particles, etc. as a model material for snow. As a result, only in the granular avalanches of light materials, clear heads were formed. From these experiments and theoretical analysis, it was found that the similarity of the formation of this structure relates to the chute length L and the accelerlation of gravity g and the terminal velocity of the granular avalanche on the chute Ve through a dimensionless number Ve2/Lg.m When Ve2/Lg« 1, the head-tail structure is formed.
Keywords: avalanche, head, tail, similarity
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