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http://hdl.handle.net/2122/4179
Authors: | Testut, L.* Tabacco, I. E.* Bianchi, C.* Rémy, F.* |
Title: | Influence of geometrical boundary conditions on the estimation of rheological parameters | Journal: | Annals of Glaciology | Series/Report no.: | / 30 (2000) | Publisher: | International Glaciological Society | Issue Date: | 2000 | Keywords: | Ice sheet Mass balance Bedrock-topography |
Subject Classification: | 02. 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. |
Appears in Collections: | Article published / in press |
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