Basal hydrofractures near sticky patches
Basal crevasses are macroscopic structural discontinuities at the base of ice sheets and glaciers that arise by fracture. Motivated by observations and by the mechanics of elastic fracture, we hypothesise that spatial variations in basal stress (in the presence of basal water pressure) can promote a...
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Cambridge University Press (CUP)
2022
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Online Access: | http://dx.doi.org/10.1017/jog.2022.75 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000752 |
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crcambridgeupr:10.1017/jog.2022.75 2024-09-15T18:15:39+00:00 Basal hydrofractures near sticky patches Zhang, Hanwen Davis, Timothy Katz, Richard F. Stevens, Laura A. May, Dave A. H2020 European Research Council 2022 http://dx.doi.org/10.1017/jog.2022.75 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000752 en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 69, issue 275, page 475-486 ISSN 0022-1430 1727-5652 journal-article 2022 crcambridgeupr https://doi.org/10.1017/jog.2022.75 2024-08-14T04:03:57Z Basal crevasses are macroscopic structural discontinuities at the base of ice sheets and glaciers that arise by fracture. Motivated by observations and by the mechanics of elastic fracture, we hypothesise that spatial variations in basal stress (in the presence of basal water pressure) can promote and localise basal crevassing. We quantify this process in the theoretical context of linear elastic fracture mechanics. We develop a model evaluating the effect of shear-stress variation on the growth of basal crevasses. Our results indicate that sticky patches promote the propagation of basal crevasses, increase their length of propagation into the ice and, under some conditions, give them curved trajectories that incline upstream. A detailed exploration of the parameter space is conducted to gain a better understanding of the conditions under which sticky-patch-induced basal crevassing is expected beneath ice sheets and glaciers. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 1 12 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Basal crevasses are macroscopic structural discontinuities at the base of ice sheets and glaciers that arise by fracture. Motivated by observations and by the mechanics of elastic fracture, we hypothesise that spatial variations in basal stress (in the presence of basal water pressure) can promote and localise basal crevassing. We quantify this process in the theoretical context of linear elastic fracture mechanics. We develop a model evaluating the effect of shear-stress variation on the growth of basal crevasses. Our results indicate that sticky patches promote the propagation of basal crevasses, increase their length of propagation into the ice and, under some conditions, give them curved trajectories that incline upstream. A detailed exploration of the parameter space is conducted to gain a better understanding of the conditions under which sticky-patch-induced basal crevassing is expected beneath ice sheets and glaciers. |
author2 |
H2020 European Research Council |
format |
Article in Journal/Newspaper |
author |
Zhang, Hanwen Davis, Timothy Katz, Richard F. Stevens, Laura A. May, Dave A. |
spellingShingle |
Zhang, Hanwen Davis, Timothy Katz, Richard F. Stevens, Laura A. May, Dave A. Basal hydrofractures near sticky patches |
author_facet |
Zhang, Hanwen Davis, Timothy Katz, Richard F. Stevens, Laura A. May, Dave A. |
author_sort |
Zhang, Hanwen |
title |
Basal hydrofractures near sticky patches |
title_short |
Basal hydrofractures near sticky patches |
title_full |
Basal hydrofractures near sticky patches |
title_fullStr |
Basal hydrofractures near sticky patches |
title_full_unstemmed |
Basal hydrofractures near sticky patches |
title_sort |
basal hydrofractures near sticky patches |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jog.2022.75 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000752 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 69, issue 275, page 475-486 ISSN 0022-1430 1727-5652 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2022.75 |
container_title |
Journal of Glaciology |
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1 |
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12 |
_version_ |
1810453548445466624 |