Water-Pressure Coupling of Sliding and Bed Deformation: III Application to Ice Stream B, Antarctica

Authors: Alley, R.B.; Blankenship, D.D.; Rooney, S.T.; Bentley, C.R.

Source: Journal of Glaciology, Number 119, 1989 , pp. 130-139(10)

Publisher: International Glaciological Society

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Abstract:

Geophysical studies and glaciological analyses suggest strongly that Ice Stream B, West Antarctica, moves primarily by pervasive deformation of a meters thick subglacial till. Analysis of the longitudinal profile of the ice stream up-stream of the ice plain suggests that basal sliding is slow everywhere, that effective pressure decreases slowly down-stream, and that the strain-rate of pervasive shear is proportional to the basal shear stress and inversely proportional to the square or cube of the effective pressure. Discrete shearing may occur beneath the pervasively deforming zone. These and other hypotheses, which build on the analyses of the first two papers in this series, can be tested in the field.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/002214389793701572

Publication date: January 1, 1989

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  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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