Plasticity Solution for a Glacier Snout
The flow near the end of a glacier in a steady state is investigated by using a theoretical model: a plastic–rigid material with a constant flow stress resting on a rough horizontal bed. Starting from an appropriately chosen slip-line far from the end, the slip-line field is constructed numerically...
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Language: | English |
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Cambridge University Press (CUP)
1967
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Online Access: | http://dx.doi.org/10.1017/s002214300001995x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001995X |
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crcambridgeupr:10.1017/s002214300001995x 2024-04-07T07:53:42+00:00 Plasticity Solution for a Glacier Snout Nye, J. F. 1967 http://dx.doi.org/10.1017/s002214300001995x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001995X en eng Cambridge University Press (CUP) Journal of Glaciology volume 6, issue 47, page 695-715 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1967 crcambridgeupr https://doi.org/10.1017/s002214300001995x 2024-03-08T00:34:10Z The flow near the end of a glacier in a steady state is investigated by using a theoretical model: a plastic–rigid material with a constant flow stress resting on a rough horizontal bed. Starting from an appropriately chosen slip-line far from the end, the slip-line field is constructed numerically and continued to the end of the glacier. The field rapidly settles down to a form independent of the precise starting conditions. In the region of small surface slope it agrees with the approximate analytical solution reported earlier (Nye, 1951). To avoid a breakdown in the method it is found necessary to modify the bed by a trivial amount over the final 3 m. In practice the ice can lose contact with the bed very near the end, and the effect of this on the solution is discussed. The velocity field is computed for a uniform ablation-rate. Other distributions of ablation-rate could be accommodated, but there appears to be a critical gradient of ablation-rate beyond which the slip-line field fails. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 6 47 695 715 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Nye, J. F. Plasticity Solution for a Glacier Snout |
topic_facet |
Earth-Surface Processes |
description |
The flow near the end of a glacier in a steady state is investigated by using a theoretical model: a plastic–rigid material with a constant flow stress resting on a rough horizontal bed. Starting from an appropriately chosen slip-line far from the end, the slip-line field is constructed numerically and continued to the end of the glacier. The field rapidly settles down to a form independent of the precise starting conditions. In the region of small surface slope it agrees with the approximate analytical solution reported earlier (Nye, 1951). To avoid a breakdown in the method it is found necessary to modify the bed by a trivial amount over the final 3 m. In practice the ice can lose contact with the bed very near the end, and the effect of this on the solution is discussed. The velocity field is computed for a uniform ablation-rate. Other distributions of ablation-rate could be accommodated, but there appears to be a critical gradient of ablation-rate beyond which the slip-line field fails. |
format |
Article in Journal/Newspaper |
author |
Nye, J. F. |
author_facet |
Nye, J. F. |
author_sort |
Nye, J. F. |
title |
Plasticity Solution for a Glacier Snout |
title_short |
Plasticity Solution for a Glacier Snout |
title_full |
Plasticity Solution for a Glacier Snout |
title_fullStr |
Plasticity Solution for a Glacier Snout |
title_full_unstemmed |
Plasticity Solution for a Glacier Snout |
title_sort |
plasticity solution for a glacier snout |
publisher |
Cambridge University Press (CUP) |
publishDate |
1967 |
url |
http://dx.doi.org/10.1017/s002214300001995x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001995X |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 6, issue 47, page 695-715 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300001995x |
container_title |
Journal of Glaciology |
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6 |
container_issue |
47 |
container_start_page |
695 |
op_container_end_page |
715 |
_version_ |
1795669796178624512 |