Improved representation of laminar and turbulent sheet flow in subglacial drainage models
Abstract Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet–channel subglacial drainage model to smoothly transitio...
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Cambridge University Press (CUP)
2023
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Online Access: | http://dx.doi.org/10.1017/jog.2023.103 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302300103X |
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crcambridgeupr:10.1017/jog.2023.103 2024-03-03T08:45:55+00:00 Improved representation of laminar and turbulent sheet flow in subglacial drainage models Hill, Tim Flowers, Gwenn Elizabeth Hoffman, Matthew James Bingham, Derek Werder, Mauro Angelo Natural Sciences and Engineering Research Council of Canada 2023 http://dx.doi.org/10.1017/jog.2023.103 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302300103X en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by-nc-sa/4.0 Journal of Glaciology page 1-14 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2023 crcambridgeupr https://doi.org/10.1017/jog.2023.103 2024-02-08T08:32:27Z Abstract Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet–channel subglacial drainage model to smoothly transition between laminar and turbulent flow based on the locally computed Reynolds number in a physically consistent way (the ‘transition’ model). We compare the transition model to standard laminar and turbulent models to assess the role of the sheet-flow parameterization in reconciling observed and modelled water pressures under idealized and realistic forcing. Relative to the turbulent model, the laminar and transition models improve seasonal simulations by increasing winter water pressure and producing a more prominent late-summer water pressure minimum. In contrast to the laminar model, the transition model remains consistent with its own internal assumptions across all flow regimes. Based on the internal consistency of the transition model and its improved performance relative to the standard turbulent model, we recommend its use for transient simulations of subglacial drainage. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 1 14 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Hill, Tim Flowers, Gwenn Elizabeth Hoffman, Matthew James Bingham, Derek Werder, Mauro Angelo Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
topic_facet |
Earth-Surface Processes |
description |
Abstract Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet–channel subglacial drainage model to smoothly transition between laminar and turbulent flow based on the locally computed Reynolds number in a physically consistent way (the ‘transition’ model). We compare the transition model to standard laminar and turbulent models to assess the role of the sheet-flow parameterization in reconciling observed and modelled water pressures under idealized and realistic forcing. Relative to the turbulent model, the laminar and transition models improve seasonal simulations by increasing winter water pressure and producing a more prominent late-summer water pressure minimum. In contrast to the laminar model, the transition model remains consistent with its own internal assumptions across all flow regimes. Based on the internal consistency of the transition model and its improved performance relative to the standard turbulent model, we recommend its use for transient simulations of subglacial drainage. |
author2 |
Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Hill, Tim Flowers, Gwenn Elizabeth Hoffman, Matthew James Bingham, Derek Werder, Mauro Angelo |
author_facet |
Hill, Tim Flowers, Gwenn Elizabeth Hoffman, Matthew James Bingham, Derek Werder, Mauro Angelo |
author_sort |
Hill, Tim |
title |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_short |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_full |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_fullStr |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_full_unstemmed |
Improved representation of laminar and turbulent sheet flow in subglacial drainage models |
title_sort |
improved representation of laminar and turbulent sheet flow in subglacial drainage models |
publisher |
Cambridge University Press (CUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1017/jog.2023.103 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302300103X |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology page 1-14 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/4.0 |
op_doi |
https://doi.org/10.1017/jog.2023.103 |
container_title |
Journal of Glaciology |
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1 |
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14 |
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1792501591579820032 |