A novel method for predicting fracture in floating ice
Basal crevasses may play an important precursory role in determining both the location and propagation of rifts and iceberg dimensions. For example, icebergs calved recently from Thwaites Glacier, Antarctica, have the same width as surface undulations, strengthening the connection between basal crev...
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ftunivmemphis:oai:digitalcommons.memphis.edu:facpubs-2174 2023-07-16T03:52:20+02:00 A novel method for predicting fracture in floating ice Logan, Liz Catania, Ginny Lavier, Luc Choi, Eunseo 2013-08-01T07:00:00Z https://digitalcommons.memphis.edu/facpubs/1175 https://doi.org/10.3189/2013JoG12J210 unknown University of Memphis Digital Commons https://digitalcommons.memphis.edu/facpubs/1175 doi:10.3189/2013JoG12J210 https://doi.org/10.3189/2013JoG12J210 Faculty Publications Geophysics and Seismology text 2013 ftunivmemphis https://doi.org/10.3189/2013JoG12J210 2023-06-28T22:42:28Z Basal crevasses may play an important precursory role in determining both the location and propagation of rifts and iceberg dimensions. For example, icebergs calved recently from Thwaites Glacier, Antarctica, have the same width as surface undulations, strengthening the connection between basal crevasses, rifting and calving. We explore a novel method for estimating the heights of basal crevasses formed at the grounding lines of ice shelves and ice streams. We employ a thin-elastic beam (TEB) formulation and tensional yielding criterion to capture the physics of flexed ice at grounding lines. Observations of basal crevasse heights compare well with model predictions in the Siple Coast region of the Ross Ice Shelf. We find that the TEB method is most accurate in areas of low strain rate. We also test the method in other areas of Antarctica to produce order-of-magnitude maps of grounding-line basal crevasses and find general agreement with reported observations assuming basal crevasses develop in spatio-temporal sequence and are advected downstream. This method is computationally cheap and could be relatively easy to implement into damage-oriented large-scale ice models which aim at physically simulating calving and fracture processes. Text Antarc* Antarctica Ice Shelf Ice Shelves Ross Ice Shelf Thwaites Glacier University of Memphis Digital Commons Ross Ice Shelf Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Coast ENVELOPE(-155.000,-155.000,-82.000,-82.000) Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Journal of Glaciology 59 216 750 758 |
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Open Polar |
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University of Memphis Digital Commons |
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ftunivmemphis |
language |
unknown |
topic |
Geophysics and Seismology |
spellingShingle |
Geophysics and Seismology Logan, Liz Catania, Ginny Lavier, Luc Choi, Eunseo A novel method for predicting fracture in floating ice |
topic_facet |
Geophysics and Seismology |
description |
Basal crevasses may play an important precursory role in determining both the location and propagation of rifts and iceberg dimensions. For example, icebergs calved recently from Thwaites Glacier, Antarctica, have the same width as surface undulations, strengthening the connection between basal crevasses, rifting and calving. We explore a novel method for estimating the heights of basal crevasses formed at the grounding lines of ice shelves and ice streams. We employ a thin-elastic beam (TEB) formulation and tensional yielding criterion to capture the physics of flexed ice at grounding lines. Observations of basal crevasse heights compare well with model predictions in the Siple Coast region of the Ross Ice Shelf. We find that the TEB method is most accurate in areas of low strain rate. We also test the method in other areas of Antarctica to produce order-of-magnitude maps of grounding-line basal crevasses and find general agreement with reported observations assuming basal crevasses develop in spatio-temporal sequence and are advected downstream. This method is computationally cheap and could be relatively easy to implement into damage-oriented large-scale ice models which aim at physically simulating calving and fracture processes. |
format |
Text |
author |
Logan, Liz Catania, Ginny Lavier, Luc Choi, Eunseo |
author_facet |
Logan, Liz Catania, Ginny Lavier, Luc Choi, Eunseo |
author_sort |
Logan, Liz |
title |
A novel method for predicting fracture in floating ice |
title_short |
A novel method for predicting fracture in floating ice |
title_full |
A novel method for predicting fracture in floating ice |
title_fullStr |
A novel method for predicting fracture in floating ice |
title_full_unstemmed |
A novel method for predicting fracture in floating ice |
title_sort |
novel method for predicting fracture in floating ice |
publisher |
University of Memphis Digital Commons |
publishDate |
2013 |
url |
https://digitalcommons.memphis.edu/facpubs/1175 https://doi.org/10.3189/2013JoG12J210 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-155.000,-155.000,-82.000,-82.000) ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
Ross Ice Shelf Siple Siple Coast Thwaites Glacier |
geographic_facet |
Ross Ice Shelf Siple Siple Coast Thwaites Glacier |
genre |
Antarc* Antarctica Ice Shelf Ice Shelves Ross Ice Shelf Thwaites Glacier |
genre_facet |
Antarc* Antarctica Ice Shelf Ice Shelves Ross Ice Shelf Thwaites Glacier |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.memphis.edu/facpubs/1175 doi:10.3189/2013JoG12J210 https://doi.org/10.3189/2013JoG12J210 |
op_doi |
https://doi.org/10.3189/2013JoG12J210 |
container_title |
Journal of Glaciology |
container_volume |
59 |
container_issue |
216 |
container_start_page |
750 |
op_container_end_page |
758 |
_version_ |
1771545268274069504 |