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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
Issue Date: 2000
Series/Report no.: / 30 (2000)
Keywords: Ice sheet
Mass balance
Subject Classification02. Cryosphere::02.02. Glaciers::02.02.03. Geomorphology 
02. Cryosphere::02.02. Glaciers::02.02.04. Ice 
02. Cryosphere::02.02. Glaciers::02.02.05. Ice dynamics 
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.
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