FRACTURE-MECHANICS APPROACH TO PENETRATION OF BOTTOM CREVASSES ON GLACIERS

Authors
Citation
Cj. Vanderveen, FRACTURE-MECHANICS APPROACH TO PENETRATION OF BOTTOM CREVASSES ON GLACIERS, Cold regions science and technology, 27(3), 1998, pp. 213-223
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary",Engineering,"Environmental Sciences
Journal title
ISSN journal
0165-232X
Volume
27
Issue
3
Year of publication
1998
Pages
213 - 223
Database
ISI
SICI code
0165-232X(1998)27:3<213:FATPOB>2.0.ZU;2-Z
Abstract
A simple model, based on linear elastic fracture mechanics, is used to investigate conditions allowing the existence of bottom crevasses. On grounded glaciers, these crevasses can only occur if the basal water pressure is close to the ice overburden pressure. If the piezometric h ead drops more than similar to 10 m below the flotation level, very la rge stretching rates are required for appreciable bottom crevasses to form. This combination of special conditions may explain the lack of o bservations of basal crevassing on grounded glaciers. (C) 1998 Elsevie r Science B.V. All rights reserved.