Effect of compressive loading on first-year sea-ice permeability

The permeability of sea ice can strongly affect the dissipation of wave energy into the ice pack. Sea-ice permeability is known to be impacted by the brine volume fraction and the blockage of flow pathways by the freezing of infiltrating lower salinity water. Here we investigate another process impa...

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Bibliographic Details
Published in:Journal of glaciology 2018-06, Vol.64 (245), p.443-449
Main Authors: RENSHAW, CARL E., MARCHENKO, ALEKSEY, SCHULSON, ERLAND M., KARULIN, EVGENY
Format: Article
Language:English
Subjects:
Brines
Cracks
Deformation
Deformation mechanisms
Energy dissipation
Freezing
Ice
ice physics
Laboratories
Oceans
Permeability
Saline water
Sea ice
Sea ice deformation
sea-ice dynamics
sea-ice modelling
Wave energy
Wave power
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Summary:The permeability of sea ice can strongly affect the dissipation of wave energy into the ice pack. Sea-ice permeability is known to be impacted by the brine volume fraction and the blockage of flow pathways by the freezing of infiltrating lower salinity water. Here we investigate another process impacting sea-ice permeability, namely, inelastic deformation. We report the results of a first-of-its-kind field-scale deformation experiment to investigate the impact of compressive loading on sea-ice permeability. We observed that deformation decreased permeability by four orders of magnitude or more in some locations, while elsewhere permeability was unaffected or possibly increased. We show that the observed changes in permeability are consistent with expected changes in stress state and, as a result, in the mechanisms of deformation.
ISSN:0022-1430
1727-5652
DOI:10.1017/jog.2018.32