Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica
Survey data from three transverse profiles across Rutford Ice Stream show that most of the shear deformation occurs in boundary layers about 10 km wide on both sides of the glacier. There is a central part, also about 10 km wide, where lateral shear-stress gradients are not significantly different f...
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International Glaciological Society
1988
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Online Access: | http://nora.nerc.ac.uk/id/eprint/521625/ https://doi.org/10.3189/S0260305500006261 |
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ftnerc:oai:nora.nerc.ac.uk:521625 2023-05-15T13:29:21+02:00 Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica Frolich, R.M. Doake, C.S.M. 1988 http://nora.nerc.ac.uk/id/eprint/521625/ https://doi.org/10.3189/S0260305500006261 unknown International Glaciological Society Frolich, R.M.; Doake, C.S.M. 1988 Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica. Annals of Glaciology, 11. 19-22. https://doi.org/10.3189/S0260305500006261 <https://doi.org/10.3189/S0260305500006261> Publication - Article PeerReviewed 1988 ftnerc https://doi.org/10.3189/S0260305500006261 2023-02-04T19:47:27Z Survey data from three transverse profiles across Rutford Ice Stream show that most of the shear deformation occurs in boundary layers about 10 km wide on both sides of the glacier. There is a central part, also about 10 km wide, where lateral shear-stress gradients are not significantly different from zero. This implies that friction from the side walls does not impede the flow in the middle of the glacier. Instead, a basal shear stress of around 40 kPa is required in order to provide the necessary restraint. Even then, only a small proportion of the forward movement will be caused by internal deformation of the ice and the remainder must arise from sliding or rapid deformation at or near the base of the glacier. Although the present analysis does not consider in detail the variation with depth in stresses and strain-rates, the formulation of the problem suggests that a self-consistent solution can be found for the distribution of basal and vertical shear stresses. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Rutford Ice Stream Natural Environment Research Council: NERC Open Research Archive Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) Annals of Glaciology 11 19 22 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
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unknown |
description |
Survey data from three transverse profiles across Rutford Ice Stream show that most of the shear deformation occurs in boundary layers about 10 km wide on both sides of the glacier. There is a central part, also about 10 km wide, where lateral shear-stress gradients are not significantly different from zero. This implies that friction from the side walls does not impede the flow in the middle of the glacier. Instead, a basal shear stress of around 40 kPa is required in order to provide the necessary restraint. Even then, only a small proportion of the forward movement will be caused by internal deformation of the ice and the remainder must arise from sliding or rapid deformation at or near the base of the glacier. Although the present analysis does not consider in detail the variation with depth in stresses and strain-rates, the formulation of the problem suggests that a self-consistent solution can be found for the distribution of basal and vertical shear stresses. |
format |
Article in Journal/Newspaper |
author |
Frolich, R.M. Doake, C.S.M. |
spellingShingle |
Frolich, R.M. Doake, C.S.M. Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica |
author_facet |
Frolich, R.M. Doake, C.S.M. |
author_sort |
Frolich, R.M. |
title |
Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica |
title_short |
Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica |
title_full |
Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica |
title_fullStr |
Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica |
title_full_unstemmed |
Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica |
title_sort |
relative importance of lateral and vertical shear on rutford ice stream, antarctica |
publisher |
International Glaciological Society |
publishDate |
1988 |
url |
http://nora.nerc.ac.uk/id/eprint/521625/ https://doi.org/10.3189/S0260305500006261 |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
Rutford Rutford Ice Stream |
geographic_facet |
Rutford Rutford Ice Stream |
genre |
Annals of Glaciology Antarc* Antarctica Rutford Ice Stream |
genre_facet |
Annals of Glaciology Antarc* Antarctica Rutford Ice Stream |
op_relation |
Frolich, R.M.; Doake, C.S.M. 1988 Relative importance of lateral and vertical shear on Rutford Ice Stream, Antarctica. Annals of Glaciology, 11. 19-22. https://doi.org/10.3189/S0260305500006261 <https://doi.org/10.3189/S0260305500006261> |
op_doi |
https://doi.org/10.3189/S0260305500006261 |
container_title |
Annals of Glaciology |
container_volume |
11 |
container_start_page |
19 |
op_container_end_page |
22 |
_version_ |
1766000154065764352 |