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Authors: Testut, L.*
Tabacco, I. E.*
Bianchi, C.*
Rémy, F.*
Title: Influence of geometrical boundary conditions on the estimation of rheological parameters
Title of journal: Annals of Glaciology
Series/Report no.: / 30 (2000)
Publisher: International Glaciological Society
Issue Date: 2000
Keywords: Ice sheet
Mass balance
Abstract: Improved knowledge of geometrical boundary conditions, such as bedrock geometry and surface topography, can contribute significantly to glaciological studies including ice-sheet-flow modelling. Precise thickness and altimetric data allow an estimation of ice-flow direction, the balance velocity and the basal shear stress. These parameters are calculated along a 1160 km profile in East Antarctica using a relationship between shear stress, basal temperature, the Glen flow exponent and a parameter related to strain rate. Strong variations of the flow-law parameters and basal conditions are found to play a major role in the ice-flow pattern. Sliding, anisotropy and longitudinal stress strongly perturb the validity of the law, but their signature can be identified.
Appears in Collections:02.02.03. Geomorphology
02.02.04. Ice
02.02.05. Ice dynamics
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