Influence of geometrical boundary conditions on the estimation of rheological parameters

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 veloc...

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Bibliographic Details
Published in:Annals of Glaciology
Main Authors: Frédérique Rémy, C. Bianchi, Ignazio E. Tabacco, Laurent Testut
Format: Article in Journal/Newspaper
Language:English
Published: 2000
Subjects:
NEANIAS Atmospheric Research Community
Earth-Surface Processes
Antarc*
Antarctica
East Antarctica
Ice Sheet
Online Access:https://www.openaccessrepository.it/record/121927
https://doi.org/10.3189/172756400781820877
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Summary: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.

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