January 1, 2000 Journal article Open Access

Frédérique Rémy; C. Bianchi; Ignazio E. Tabacco; Laurent Testut

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    <subfield code="a">Influence of geometrical boundary conditions on the estimation of rheological parameters</subfield>
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    <subfield code="a">AbstractImproved 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.</subfield>
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