Cauldron subsidence and subglacial floods
Ice cauldrons are depressions which form at the surface of ice sheets when an underlying subglacial lake empties, in particular when subglacial volcanic eruptions occur. Notable examples of such cauldrons occur on the surface of the Vatnajökull ice cap in Iceland. More generally, cauldrons will form...
Published in: | Annals of Glaciology |
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Language: | English |
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Online Access: | https://research.manchester.ac.uk/en/publications/c4cf6915-fad3-46e7-8dfe-9ff3387f1da4 https://doi.org/10.3189/172756407782282561 |
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ftumanchesterpub:oai:pure.atira.dk:publications/c4cf6915-fad3-46e7-8dfe-9ff3387f1da4 2023-11-12T04:01:20+01:00 Cauldron subsidence and subglacial floods Evatt, G. W. Fowler, A. C. 2007 https://research.manchester.ac.uk/en/publications/c4cf6915-fad3-46e7-8dfe-9ff3387f1da4 https://doi.org/10.3189/172756407782282561 eng eng info:eu-repo/semantics/closedAccess Evatt , G W & Fowler , A C 2007 , ' Cauldron subsidence and subglacial floods ' , Annals of Glaciology , vol. 45 , pp. 163-168 . https://doi.org/10.3189/172756407782282561 article 2007 ftumanchesterpub https://doi.org/10.3189/172756407782282561 2023-10-30T09:14:15Z Ice cauldrons are depressions which form at the surface of ice sheets when an underlying subglacial lake empties, in particular when subglacial volcanic eruptions occur. Notable examples of such cauldrons occur on the surface of the Vatnajökull ice cap in Iceland. More generally, cauldrons will form when a subglacial lake empties during a jökulhlaup. The rate of subsidence of the ice surface is related to the rate at which the subglacial water empties from the lake. We use a viscous version of classical beam theory applied to the ice sheet to determine the relation between the subsidence rate and flood discharge. We use the results to make inferences concerning ring fracture spacings in cauldrons, the consequent effect on flood discharge dynamics and the likely nature of subsidence events in the Antarctic Ice Sheet. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Ice cap Ice Sheet Iceland Vatnajökull The University of Manchester: Research Explorer Antarctic The Antarctic Vatnajökull ENVELOPE(-16.823,-16.823,64.420,64.420) Annals of Glaciology 45 163 168 |
institution |
Open Polar |
collection |
The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
description |
Ice cauldrons are depressions which form at the surface of ice sheets when an underlying subglacial lake empties, in particular when subglacial volcanic eruptions occur. Notable examples of such cauldrons occur on the surface of the Vatnajökull ice cap in Iceland. More generally, cauldrons will form when a subglacial lake empties during a jökulhlaup. The rate of subsidence of the ice surface is related to the rate at which the subglacial water empties from the lake. We use a viscous version of classical beam theory applied to the ice sheet to determine the relation between the subsidence rate and flood discharge. We use the results to make inferences concerning ring fracture spacings in cauldrons, the consequent effect on flood discharge dynamics and the likely nature of subsidence events in the Antarctic Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
Evatt, G. W. Fowler, A. C. |
spellingShingle |
Evatt, G. W. Fowler, A. C. Cauldron subsidence and subglacial floods |
author_facet |
Evatt, G. W. Fowler, A. C. |
author_sort |
Evatt, G. W. |
title |
Cauldron subsidence and subglacial floods |
title_short |
Cauldron subsidence and subglacial floods |
title_full |
Cauldron subsidence and subglacial floods |
title_fullStr |
Cauldron subsidence and subglacial floods |
title_full_unstemmed |
Cauldron subsidence and subglacial floods |
title_sort |
cauldron subsidence and subglacial floods |
publishDate |
2007 |
url |
https://research.manchester.ac.uk/en/publications/c4cf6915-fad3-46e7-8dfe-9ff3387f1da4 https://doi.org/10.3189/172756407782282561 |
long_lat |
ENVELOPE(-16.823,-16.823,64.420,64.420) |
geographic |
Antarctic The Antarctic Vatnajökull |
geographic_facet |
Antarctic The Antarctic Vatnajökull |
genre |
Annals of Glaciology Antarc* Antarctic Ice cap Ice Sheet Iceland Vatnajökull |
genre_facet |
Annals of Glaciology Antarc* Antarctic Ice cap Ice Sheet Iceland Vatnajökull |
op_source |
Evatt , G W & Fowler , A C 2007 , ' Cauldron subsidence and subglacial floods ' , Annals of Glaciology , vol. 45 , pp. 163-168 . https://doi.org/10.3189/172756407782282561 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.3189/172756407782282561 |
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Annals of Glaciology |
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45 |
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163 |
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168 |
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1782332332382879744 |