Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification
Abstract This paper presents a physics-based macroscale model for the densification of dry snow which provides for a smooth transition between densification by grain-boundary sliding (stage 1) and densification by power-law creep (stage 2). The model uses established values of the stage 1 and 2 dens...
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Online Access: | http://dx.doi.org/10.1017/jog.2021.95 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021000952 |
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crcambridgeupr:10.1017/jog.2021.95 2024-03-17T08:58:43+00:00 Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification Morris, Elizabeth M. Montgomery, Lynn N. Mulvaney, Robert National Science Foundation H2020 European Research Council Natural Environment Research Council 2021 http://dx.doi.org/10.1017/jog.2021.95 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021000952 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 68, issue 269, page 417-430 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2021 crcambridgeupr https://doi.org/10.1017/jog.2021.95 2024-02-20T00:03:05Z Abstract This paper presents a physics-based macroscale model for the densification of dry snow which provides for a smooth transition between densification by grain-boundary sliding (stage 1) and densification by power-law creep (stage 2). The model uses established values of the stage 1 and 2 densification rates away from the transition zone and two transition parameters with a simple physical basis: the transition density and the half-width of the transition zone. It has been calibrated using density profiles from the SUMup database and physically based expressions for the transition parameters have been derived. The transition model produces better predictions of the depth of the nominal bubble close-off horizon than the Herron and Langway model, both in its classical form and in a recent version with re-optimised densification rates. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Langway ENVELOPE(-139.783,-139.783,-75.483,-75.483) Journal of Glaciology 1 14 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Morris, Elizabeth M. Montgomery, Lynn N. Mulvaney, Robert Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification |
topic_facet |
Earth-Surface Processes |
description |
Abstract This paper presents a physics-based macroscale model for the densification of dry snow which provides for a smooth transition between densification by grain-boundary sliding (stage 1) and densification by power-law creep (stage 2). The model uses established values of the stage 1 and 2 densification rates away from the transition zone and two transition parameters with a simple physical basis: the transition density and the half-width of the transition zone. It has been calibrated using density profiles from the SUMup database and physically based expressions for the transition parameters have been derived. The transition model produces better predictions of the depth of the nominal bubble close-off horizon than the Herron and Langway model, both in its classical form and in a recent version with re-optimised densification rates. |
author2 |
National Science Foundation H2020 European Research Council Natural Environment Research Council |
format |
Article in Journal/Newspaper |
author |
Morris, Elizabeth M. Montgomery, Lynn N. Mulvaney, Robert |
author_facet |
Morris, Elizabeth M. Montgomery, Lynn N. Mulvaney, Robert |
author_sort |
Morris, Elizabeth M. |
title |
Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification |
title_short |
Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification |
title_full |
Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification |
title_fullStr |
Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification |
title_full_unstemmed |
Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification |
title_sort |
modelling the transition from grain-boundary sliding to power-law creep in dry snow densification |
publisher |
Cambridge University Press (CUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1017/jog.2021.95 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021000952 |
long_lat |
ENVELOPE(-139.783,-139.783,-75.483,-75.483) |
geographic |
Langway |
geographic_facet |
Langway |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 68, issue 269, page 417-430 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2021.95 |
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Journal of Glaciology |
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14 |
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1793768491666374656 |