A numerical study of hydrologically driven glacier dynamics and subglacial flooding
A hydrologically coupled flowband model of ‘higher order’ ice dynamics is used to explore perturbations in response to supraglacial water drainage and subglacial flooding. The subglacial drainage system includes interacting ‘fast’ and ‘slow’ drainage elements. The fast drainage system is assumed to...
Published in: | Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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crroyalsociety:10.1098/rspa.2010.0211 2024-06-23T07:53:01+00:00 A numerical study of hydrologically driven glacier dynamics and subglacial flooding Pimentel, Sam Flowers, Gwenn E. 2010 http://dx.doi.org/10.1098/rspa.2010.0211 https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2010.0211 https://royalsocietypublishing.org/doi/full-xml/10.1098/rspa.2010.0211 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 467, issue 2126, page 537-558 ISSN 1364-5021 1471-2946 journal-article 2010 crroyalsociety https://doi.org/10.1098/rspa.2010.0211 2024-06-10T04:15:13Z A hydrologically coupled flowband model of ‘higher order’ ice dynamics is used to explore perturbations in response to supraglacial water drainage and subglacial flooding. The subglacial drainage system includes interacting ‘fast’ and ‘slow’ drainage elements. The fast drainage system is assumed to be composed of ice-walled conduits and the slow system of a macroporous water sheet. Under high subglacial water pressures, flexure of the overlying ice is modelled using elastic beam theory. A regularized Coulomb friction law describes basal boundary conditions that enable hydrologically driven acceleration. We demonstrate the modelled interactions between hydrology and ice dynamics by means of three observationally inspired examples: (i) simulations of meltwater drainage at an Alpine-type glacier produce seasonal and diurnal variability, and exhibit drainage evolution characteristic of the so-called ‘spring transition’; (ii) horizontal and vertical diurnal accelerations are modelled in response to summer meltwater input at a Greenland-type outlet glacier; and (iii) short-lived perturbations to basal water pressure and ice-flow speed are modelled in response to the prescribed drainage of a supraglacial lake. Our model supports the suggestion that a channelized drainage system can form beneath the margins of the Greenland ice sheet, and may contribute to reducing the dynamic impact of floods derived from supraglacial lakes. Article in Journal/Newspaper glacier Greenland Ice Sheet The Royal Society Greenland Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467 2126 537 558 |
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Open Polar |
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The Royal Society |
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crroyalsociety |
language |
English |
description |
A hydrologically coupled flowband model of ‘higher order’ ice dynamics is used to explore perturbations in response to supraglacial water drainage and subglacial flooding. The subglacial drainage system includes interacting ‘fast’ and ‘slow’ drainage elements. The fast drainage system is assumed to be composed of ice-walled conduits and the slow system of a macroporous water sheet. Under high subglacial water pressures, flexure of the overlying ice is modelled using elastic beam theory. A regularized Coulomb friction law describes basal boundary conditions that enable hydrologically driven acceleration. We demonstrate the modelled interactions between hydrology and ice dynamics by means of three observationally inspired examples: (i) simulations of meltwater drainage at an Alpine-type glacier produce seasonal and diurnal variability, and exhibit drainage evolution characteristic of the so-called ‘spring transition’; (ii) horizontal and vertical diurnal accelerations are modelled in response to summer meltwater input at a Greenland-type outlet glacier; and (iii) short-lived perturbations to basal water pressure and ice-flow speed are modelled in response to the prescribed drainage of a supraglacial lake. Our model supports the suggestion that a channelized drainage system can form beneath the margins of the Greenland ice sheet, and may contribute to reducing the dynamic impact of floods derived from supraglacial lakes. |
format |
Article in Journal/Newspaper |
author |
Pimentel, Sam Flowers, Gwenn E. |
spellingShingle |
Pimentel, Sam Flowers, Gwenn E. A numerical study of hydrologically driven glacier dynamics and subglacial flooding |
author_facet |
Pimentel, Sam Flowers, Gwenn E. |
author_sort |
Pimentel, Sam |
title |
A numerical study of hydrologically driven glacier dynamics and subglacial flooding |
title_short |
A numerical study of hydrologically driven glacier dynamics and subglacial flooding |
title_full |
A numerical study of hydrologically driven glacier dynamics and subglacial flooding |
title_fullStr |
A numerical study of hydrologically driven glacier dynamics and subglacial flooding |
title_full_unstemmed |
A numerical study of hydrologically driven glacier dynamics and subglacial flooding |
title_sort |
numerical study of hydrologically driven glacier dynamics and subglacial flooding |
publisher |
The Royal Society |
publishDate |
2010 |
url |
http://dx.doi.org/10.1098/rspa.2010.0211 https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2010.0211 https://royalsocietypublishing.org/doi/full-xml/10.1098/rspa.2010.0211 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 467, issue 2126, page 537-558 ISSN 1364-5021 1471-2946 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rspa.2010.0211 |
container_title |
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
467 |
container_issue |
2126 |
container_start_page |
537 |
op_container_end_page |
558 |
_version_ |
1802644488507621376 |