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...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2007
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| _version_ | 1797052512656687104 |
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| author | Evatt, G Fowler, A |
| author_facet | Evatt, G Fowler, A |
| author_sort | Evatt, G |
| collection | OXFORD |
| 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. |
| first_indexed | 2024-03-06T18:32:37Z |
| format | Journal article |
| id | oxford-uuid:0a2e7988-a262-4ca6-b16e-c3112d54ae68 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:32:37Z |
| publishDate | 2007 |
| record_format | dspace |
| spelling | oxford-uuid:0a2e7988-a262-4ca6-b16e-c3112d54ae682022-03-26T09:22:21ZCauldron subsidence and subglacial floodsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0a2e7988-a262-4ca6-b16e-c3112d54ae68EnglishSymplectic Elements at Oxford2007Evatt, GFowler, AIce 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. |
| spellingShingle | Evatt, G Fowler, A Cauldron subsidence and subglacial floods |
| title | 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_short | Cauldron subsidence and subglacial floods |
| title_sort | cauldron subsidence and subglacial floods |
| work_keys_str_mv | AT evattg cauldronsubsidenceandsubglacialfloods AT fowlera cauldronsubsidenceandsubglacialfloods |