On the rheology of till
The deformation of subglacial till is instrumental in causing certain glacier surges, the motion of rapid ice streams in ice sheets, and ice-sheet surges which are associated with Heinrich events, and consequent rapid climatic shifts, during the last ice age. It may also be the means whereby drumlin...
Published in: | Annals of Glaciology |
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Language: | English |
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2016
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Online Access: | https://doi.org/10.3189/172756403781815951 https://ora.ox.ac.uk/objects/uuid:fa69c01a-d2c1-418d-8ba4-d7d2d25e3b8d |
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ftuloxford:oai:ora.ox.ac.uk:uuid:fa69c01a-d2c1-418d-8ba4-d7d2d25e3b8d 2023-05-15T16:40:49+02:00 On the rheology of till Fowler, A 2016-07-29 https://doi.org/10.3189/172756403781815951 https://ora.ox.ac.uk/objects/uuid:fa69c01a-d2c1-418d-8ba4-d7d2d25e3b8d eng eng doi:10.3189/172756403781815951 https://ora.ox.ac.uk/objects/uuid:fa69c01a-d2c1-418d-8ba4-d7d2d25e3b8d https://doi.org/10.3189/172756403781815951 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.3189/172756403781815951 2022-06-28T20:28:37Z The deformation of subglacial till is instrumental in causing certain glacier surges, the motion of rapid ice streams in ice sheets, and ice-sheet surges which are associated with Heinrich events, and consequent rapid climatic shifts, during the last ice age. It may also be the means whereby drumlins are formed, and these in turn may act as a brake on large-scale ice flow. It is therefore important in building models to understand the rate at which till deforms, and how this controls the basal ice velocity. In recent years, two paradigms have emerged. On the one hand, theoreticians have tended to use a viscous rheology, though this lacks quantitative support. On the other hand, field and laboratory studies suggest that till behaves plastically. In this paper I will examine some of the dynamic consequences of this latter assumption, and show how the dichotomy between viscous and plastic may be less clear-cut than previously thought. © International Glaciological Society. Article in Journal/Newspaper Ice Sheet ORA - Oxford University Research Archive Annals of Glaciology 37 55 59 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
description |
The deformation of subglacial till is instrumental in causing certain glacier surges, the motion of rapid ice streams in ice sheets, and ice-sheet surges which are associated with Heinrich events, and consequent rapid climatic shifts, during the last ice age. It may also be the means whereby drumlins are formed, and these in turn may act as a brake on large-scale ice flow. It is therefore important in building models to understand the rate at which till deforms, and how this controls the basal ice velocity. In recent years, two paradigms have emerged. On the one hand, theoreticians have tended to use a viscous rheology, though this lacks quantitative support. On the other hand, field and laboratory studies suggest that till behaves plastically. In this paper I will examine some of the dynamic consequences of this latter assumption, and show how the dichotomy between viscous and plastic may be less clear-cut than previously thought. © International Glaciological Society. |
format |
Article in Journal/Newspaper |
author |
Fowler, A |
spellingShingle |
Fowler, A On the rheology of till |
author_facet |
Fowler, A |
author_sort |
Fowler, A |
title |
On the rheology of till |
title_short |
On the rheology of till |
title_full |
On the rheology of till |
title_fullStr |
On the rheology of till |
title_full_unstemmed |
On the rheology of till |
title_sort |
on the rheology of till |
publishDate |
2016 |
url |
https://doi.org/10.3189/172756403781815951 https://ora.ox.ac.uk/objects/uuid:fa69c01a-d2c1-418d-8ba4-d7d2d25e3b8d |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
doi:10.3189/172756403781815951 https://ora.ox.ac.uk/objects/uuid:fa69c01a-d2c1-418d-8ba4-d7d2d25e3b8d https://doi.org/10.3189/172756403781815951 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.3189/172756403781815951 |
container_title |
Annals of Glaciology |
container_volume |
37 |
container_start_page |
55 |
op_container_end_page |
59 |
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1766031248176709632 |