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
2023
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ftdoajarticles:oai:doaj.org/article:68bb383bd8964d56b06e7ffc46ce750d 2023-06-11T04:12:49+02:00 Basal hydrofractures near sticky patches Hanwen Zhang Timothy Davis Richard F. Katz Laura A. Stevens Dave A. May 2023-06-01T00:00:00Z https://doi.org/10.1017/jog.2022.75 https://doaj.org/article/68bb383bd8964d56b06e7ffc46ce750d EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143022000752/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.75 0022-1430 1727-5652 https://doaj.org/article/68bb383bd8964d56b06e7ffc46ce750d Journal of Glaciology, Vol 69, Pp 475-486 (2023) Calving crevasses glacier modelling ice-sheet modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1017/jog.2022.75 2023-05-28T00:37:02Z 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 Ice Sheet Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 1 12 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Calving crevasses glacier modelling ice-sheet modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Calving crevasses glacier modelling ice-sheet modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Hanwen Zhang Timothy Davis Richard F. Katz Laura A. Stevens Dave A. May Basal hydrofractures near sticky patches |
topic_facet |
Calving crevasses glacier modelling ice-sheet modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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. |
format |
Article in Journal/Newspaper |
author |
Hanwen Zhang Timothy Davis Richard F. Katz Laura A. Stevens Dave A. May |
author_facet |
Hanwen Zhang Timothy Davis Richard F. Katz Laura A. Stevens Dave A. May |
author_sort |
Hanwen Zhang |
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 |
publishDate |
2023 |
url |
https://doi.org/10.1017/jog.2022.75 https://doaj.org/article/68bb383bd8964d56b06e7ffc46ce750d |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 69, Pp 475-486 (2023) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143022000752/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.75 0022-1430 1727-5652 https://doaj.org/article/68bb383bd8964d56b06e7ffc46ce750d |
op_doi |
https://doi.org/10.1017/jog.2022.75 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
12 |
_version_ |
1768388923948531712 |