Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations
The simple calving laws currently used in ice-sheet models do not adequately reflect the complexity and diversity of calving processes. To be effective, calving laws must be grounded in a sound understanding of how calving actually works. Here, we develop a new strategy for formulating calving laws,...
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Online Access: | https://doi.org/10.1017/jog.2017.41 http://ecite.utas.edu.au/119229 |
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ftunivtasecite:oai:ecite.utas.edu.au:119229 2023-05-15T16:40:56+02:00 Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations Benn, DI Astrom, J Zwinger, T Todd, J Nick, FM Cook, S Hulton, NRJ Luckman, A 2017 application/pdf https://doi.org/10.1017/jog.2017.41 http://ecite.utas.edu.au/119229 en eng Int Glaciol Soc http://ecite.utas.edu.au/119229/1/119229 final.pdf http://dx.doi.org/10.1017/jog.2017.41 Benn, DI and Astrom, J and Zwinger, T and Todd, J and Nick, FM and Cook, S and Hulton, NRJ and Luckman, A, Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations, Journal of Glaciology, 63, (240) pp. 691-702. ISSN 0022-1430 (2017) [Refereed Article] http://ecite.utas.edu.au/119229 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1017/jog.2017.41 2019-12-13T22:18:28Z The simple calving laws currently used in ice-sheet models do not adequately reflect the complexity and diversity of calving processes. To be effective, calving laws must be grounded in a sound understanding of how calving actually works. Here, we develop a new strategy for formulating calving laws, using (a) the Helsinki Discrete Element Model (HiDEM) to explicitly model fracture and calving processes, and (b) the continuum model Elmer/Ice to identify critical stress states associated with HiDEM calving events. A range of observed calving processes emerges spontaneously from HiDEM in response to variations in ice-front buoyancy and the size of subaqueous undercuts. Calving driven by buoyancy and melt under-cutting is under-predicted by existing calving laws, but we show that the location and magnitude of HiDEM calving events can be predicted in Elmer/Ice from characteristic stress patterns. Our results open the way to developing calving laws that properly reflect the diversity of calving processes, and provide a framework for a unified theory of the calving process continuum. Article in Journal/Newspaper Ice Sheet Journal of Glaciology eCite UTAS (University of Tasmania) Journal of Glaciology 63 240 691 702 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Benn, DI Astrom, J Zwinger, T Todd, J Nick, FM Cook, S Hulton, NRJ Luckman, A Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
The simple calving laws currently used in ice-sheet models do not adequately reflect the complexity and diversity of calving processes. To be effective, calving laws must be grounded in a sound understanding of how calving actually works. Here, we develop a new strategy for formulating calving laws, using (a) the Helsinki Discrete Element Model (HiDEM) to explicitly model fracture and calving processes, and (b) the continuum model Elmer/Ice to identify critical stress states associated with HiDEM calving events. A range of observed calving processes emerges spontaneously from HiDEM in response to variations in ice-front buoyancy and the size of subaqueous undercuts. Calving driven by buoyancy and melt under-cutting is under-predicted by existing calving laws, but we show that the location and magnitude of HiDEM calving events can be predicted in Elmer/Ice from characteristic stress patterns. Our results open the way to developing calving laws that properly reflect the diversity of calving processes, and provide a framework for a unified theory of the calving process continuum. |
format |
Article in Journal/Newspaper |
author |
Benn, DI Astrom, J Zwinger, T Todd, J Nick, FM Cook, S Hulton, NRJ Luckman, A |
author_facet |
Benn, DI Astrom, J Zwinger, T Todd, J Nick, FM Cook, S Hulton, NRJ Luckman, A |
author_sort |
Benn, DI |
title |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_short |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_full |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_fullStr |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_full_unstemmed |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_sort |
melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
publisher |
Int Glaciol Soc |
publishDate |
2017 |
url |
https://doi.org/10.1017/jog.2017.41 http://ecite.utas.edu.au/119229 |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_relation |
http://ecite.utas.edu.au/119229/1/119229 final.pdf http://dx.doi.org/10.1017/jog.2017.41 Benn, DI and Astrom, J and Zwinger, T and Todd, J and Nick, FM and Cook, S and Hulton, NRJ and Luckman, A, Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations, Journal of Glaciology, 63, (240) pp. 691-702. ISSN 0022-1430 (2017) [Refereed Article] http://ecite.utas.edu.au/119229 |
op_doi |
https://doi.org/10.1017/jog.2017.41 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
240 |
container_start_page |
691 |
op_container_end_page |
702 |
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1766031371968446464 |