Particle size, shape, and load in a cold and a temperate valley glacier

Auteur :
LISTER, H.

Description :
A comparison is made of silt particle size and shape, and of boulders, from supraglacial englacial and subglacial locations of Roslin Gletscher in east Greenland, Findelengletscher in Switzerland and fragments of laboratory ground sandstone. Particle roundness increases as size decreases in each zone of both glaciers and similarly for silt and boulders from the supraglacial to the subglacial zone. Elongation expressed as width to lenght ratio has a mean value of 0.67 0.17 which persists through a wide range of silt and boulder sizes. Crushing into smaller pieces, rather than the removal of asperities is postulated as the dominant process of glacial erosion. Sediment loads are given for the glacial streams.


Type de document :
Article de périodique

Source :
Annals of Glaciology Cambridge, 1982, vol. 2, p. 39-44, Références bibliographiques : 9 réf.

Date :
1982