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Numerical investigation of the effects of temporal variations in basal lubrication on englacial strain-rate distribution

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Title: Numerical investigation of the effects of temporal variations in basal lubrication on englacial strain-rate distribution
Authors: Sugiyama, Shin Browse this author →KAKEN DB
Gudmundsson, G. Hilmar Browse this author
Helbing, Jakob Browse this author
Issue Date: 1-Jun-2003
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 37
Start Page: 49
End Page: 54
Publisher DOI: 10.3189/172756403781815618
Abstract: The effects of spatial and temporal variations in basal lubrication on the englacial strain rate and surface velocity distribution are investigated with a numerical ice-flow model. General aspects of the solutions are compared to measurements made on Lauteraargletscher, Switzerland, in 2001, that showed diurnal fluctuations in both surface velocity and englacial vertical strain. We find that spatial gradients in basal lubrication can set up variations in the deviatoric stress field that increases with distance to the bed and has a maximum value near the glacier surface. This stress field produces a significant strain rate near the surface. The temporal evolution of a slippery zone is identified as a possible cause of the observed diurnal variations in the vertical strain rate. Although general aspects of the measurements can be explained in this way, the calculated vertical strain rates are too small, suggesting that the modeled effective viscosity values using Glen’s flow law are too large near the surface.
Rights: © 2003 International Glaciological Society
Relation: http://www.igsoc.org/
Type: article
URI: http://hdl.handle.net/2115/34779
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉山 慎

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