Porosity dependence of elastic moduli of snow and firn
Measurements of elastic wave velocities enable non-destructive estimation of the mechanical properties, elastic moduli and density of snow and firn. The variation of elastic moduli with porosity in dry snow and firn is modeled using a differential effective medium scheme modified to account for the...
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Cambridge University Press
2021
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ftdoajarticles:oai:doaj.org/article:a7cee77cd46b45feb6e2920553b9f86c 2023-05-15T16:57:33+02:00 Porosity dependence of elastic moduli of snow and firn Colin M. Sayers 2021-10-01T00:00:00Z https://doi.org/10.1017/jog.2021.25 https://doaj.org/article/a7cee77cd46b45feb6e2920553b9f86c EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021000253/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.25 0022-1430 1727-5652 https://doaj.org/article/a7cee77cd46b45feb6e2920553b9f86c Journal of Glaciology, Vol 67, Pp 788-796 (2021) Polar firn snow snow physics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2021 ftdoajarticles https://doi.org/10.1017/jog.2021.25 2023-03-12T01:30:57Z Measurements of elastic wave velocities enable non-destructive estimation of the mechanical properties, elastic moduli and density of snow and firn. The variation of elastic moduli with porosity in dry snow and firn is modeled using a differential effective medium scheme modified to account for the critical porosity above which the bulk and shear moduli of the ice frame vanish. A comparison of predicted and measured elastic moduli indicates that the shear modulus of ice in snow is lower than that computed from single crystal elastic stiffnesses of ice. This may indicate that the bonds between snow particles are more deformable under shear than under compression. A partial alignment of ice crystals also may contribute. Good agreement between elastic stiffnesses of the ice frame obtained from elastic wave velocity measurements and the predictions of the theory is observed. The approach is simple and compact, and does not require the use of empirical fits to the data. Owing to its simplicity, this model may prove useful in a variety of potential applications such as construction on snow, interpretation of seismic measurements to monitor and locate avalanches and estimation of density within compacting snow deposited on glaciers and ice sheets. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 67 265 788 796 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Polar firn snow snow physics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Polar firn snow snow physics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Colin M. Sayers Porosity dependence of elastic moduli of snow and firn |
topic_facet |
Polar firn snow snow physics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Measurements of elastic wave velocities enable non-destructive estimation of the mechanical properties, elastic moduli and density of snow and firn. The variation of elastic moduli with porosity in dry snow and firn is modeled using a differential effective medium scheme modified to account for the critical porosity above which the bulk and shear moduli of the ice frame vanish. A comparison of predicted and measured elastic moduli indicates that the shear modulus of ice in snow is lower than that computed from single crystal elastic stiffnesses of ice. This may indicate that the bonds between snow particles are more deformable under shear than under compression. A partial alignment of ice crystals also may contribute. Good agreement between elastic stiffnesses of the ice frame obtained from elastic wave velocity measurements and the predictions of the theory is observed. The approach is simple and compact, and does not require the use of empirical fits to the data. Owing to its simplicity, this model may prove useful in a variety of potential applications such as construction on snow, interpretation of seismic measurements to monitor and locate avalanches and estimation of density within compacting snow deposited on glaciers and ice sheets. |
format |
Article in Journal/Newspaper |
author |
Colin M. Sayers |
author_facet |
Colin M. Sayers |
author_sort |
Colin M. Sayers |
title |
Porosity dependence of elastic moduli of snow and firn |
title_short |
Porosity dependence of elastic moduli of snow and firn |
title_full |
Porosity dependence of elastic moduli of snow and firn |
title_fullStr |
Porosity dependence of elastic moduli of snow and firn |
title_full_unstemmed |
Porosity dependence of elastic moduli of snow and firn |
title_sort |
porosity dependence of elastic moduli of snow and firn |
publisher |
Cambridge University Press |
publishDate |
2021 |
url |
https://doi.org/10.1017/jog.2021.25 https://doaj.org/article/a7cee77cd46b45feb6e2920553b9f86c |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 67, Pp 788-796 (2021) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021000253/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.25 0022-1430 1727-5652 https://doaj.org/article/a7cee77cd46b45feb6e2920553b9f86c |
op_doi |
https://doi.org/10.1017/jog.2021.25 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
265 |
container_start_page |
788 |
op_container_end_page |
796 |
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1766049123063037952 |