Thermally controlled glacier surging
Canada, are two prominent examples of surging glaciers which are thought to be controlled by their thermal regime. Both glaciers have developed large bulges which have propagated forward as travelling wave fronts, and which are thought to divide relatively stagnant downstream cold-based ice from fas...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.190.7624 2023-05-15T16:22:27+02:00 Thermally controlled glacier surging A. C. Fowler Tavi Murray F. S. L. Ng The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.190.7624 http://www.maths.ox.ac.uk/%7Efowler/papers/2001.4.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.190.7624 http://www.maths.ox.ac.uk/%7Efowler/papers/2001.4.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.maths.ox.ac.uk/%7Efowler/papers/2001.4.pdf text ftciteseerx 2016-01-07T16:54:27Z Canada, are two prominent examples of surging glaciers which are thought to be controlled by their thermal regime. Both glaciers have developed large bulges which have propagated forward as travelling wave fronts, and which are thought to divide relatively stagnant downstream cold-based ice from faster-moving warm-based upstream ice. Additionally, both glaciers are underlain by a wet, metres thick layer of deforming till. We develop a simple model for the cyclic surging behaviour of these glaciers, which interrelates the motion of the ice and till through a description of the subglacial hydrology. We find that oscillations (surges) can occur if the subglacial hydrological transmissivity is sufficiently low and the till layer is sufficiently thin, and we suggest that these oscillations are associated with the development and propagation of a travelling wave front down the glacier. We therefore interpret the travelling wave fronts on bothTrapridge Glacier and Bakaninbreen as manifestations of surges. In addition, we find that the violence of the surge in the model is associated with the resistance to ice flow offered by undulations in the bed, and the efficiency with which occasional hydrological events can release water accumulated at the glacier sole. 1. Text glacier* Unknown Bakaninbreen ENVELOPE(17.500,17.500,77.667,77.667) Canada |
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Open Polar |
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ftciteseerx |
language |
English |
description |
Canada, are two prominent examples of surging glaciers which are thought to be controlled by their thermal regime. Both glaciers have developed large bulges which have propagated forward as travelling wave fronts, and which are thought to divide relatively stagnant downstream cold-based ice from faster-moving warm-based upstream ice. Additionally, both glaciers are underlain by a wet, metres thick layer of deforming till. We develop a simple model for the cyclic surging behaviour of these glaciers, which interrelates the motion of the ice and till through a description of the subglacial hydrology. We find that oscillations (surges) can occur if the subglacial hydrological transmissivity is sufficiently low and the till layer is sufficiently thin, and we suggest that these oscillations are associated with the development and propagation of a travelling wave front down the glacier. We therefore interpret the travelling wave fronts on bothTrapridge Glacier and Bakaninbreen as manifestations of surges. In addition, we find that the violence of the surge in the model is associated with the resistance to ice flow offered by undulations in the bed, and the efficiency with which occasional hydrological events can release water accumulated at the glacier sole. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
A. C. Fowler Tavi Murray F. S. L. Ng |
spellingShingle |
A. C. Fowler Tavi Murray F. S. L. Ng Thermally controlled glacier surging |
author_facet |
A. C. Fowler Tavi Murray F. S. L. Ng |
author_sort |
A. C. Fowler |
title |
Thermally controlled glacier surging |
title_short |
Thermally controlled glacier surging |
title_full |
Thermally controlled glacier surging |
title_fullStr |
Thermally controlled glacier surging |
title_full_unstemmed |
Thermally controlled glacier surging |
title_sort |
thermally controlled glacier surging |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.190.7624 http://www.maths.ox.ac.uk/%7Efowler/papers/2001.4.pdf |
long_lat |
ENVELOPE(17.500,17.500,77.667,77.667) |
geographic |
Bakaninbreen Canada |
geographic_facet |
Bakaninbreen Canada |
genre |
glacier* |
genre_facet |
glacier* |
op_source |
http://www.maths.ox.ac.uk/%7Efowler/papers/2001.4.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.190.7624 http://www.maths.ox.ac.uk/%7Efowler/papers/2001.4.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766010429519167488 |