A Fragment–Flow Model of Dry–Snow Avalanches

Autor:	Arthur I. Mears
Rok vydání:	1980
Předmět:	Shearing (physics) 010506 paleontology 010504 meteorology & atmospheric sciences Flow (psychology) Boundary (topology) Geometry Surface finish Snow 01 natural sciences Shear (sheet metal) Transverse plane Slab Geology 0105 earth and related environmental sciences Earth-Surface Processes
Zdroj:	Journal of Glaciology. 26:153-163
ISSN:	1727-5652 0022-1430
DOI:	10.3189/s0022143000010698
Popis:	Field data on dry–slab avalanches obtained during the period 1975–79 from several snow climates suggest the following: (1) most of the mass of the typical avalanche studied consisted of fragments with lengths greater than 5 cm, (2) transverse and longitudinal shear planes formed during deceleration in the avalanche run–out zone, and (3) the flow height exceeded the slab height in most cases. No correlation was found between the run–out distance and the track or run–out zone slope, or between the run–out distance and the released slab height. The field data suggest that avalanche motion is best described as a flow of fragments in which boundary shearing stresses are sensitive to fragment size distributions and volumetric solids concentrations. These factors may be more important than the roughness of the avalanche boundary in determining maximum velocity and run–out distance.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f858e7bf55336097df49a9152a6e138 https://doi.org/10.3189/s0022143000010698 Zobrazit plný text záznamu