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You are here : eLibrary : Ice Research and Engineering : 23rd Symposium USA (2016) : Sea Ice : Studies of Drifting Ice Ridges in the Arctic Ocean during May-June 2015. Part III. Evolution in Morp...
Studies of Drifting Ice Ridges in the Arctic Ocean during May-June 2015. Part III. Evolution in Morphology
Author : Ervik Åse and Aleksey Shestov
Ice ridge properties such as geometry, macro-porosity and strength influence first-year sea ice ridge loads. These properties change during the life of a first-year sea ice ridge. The topic of the present paper is the evolution in strength and macro-porosity, especially rubble macro-porosity, during the melt season. Four drifting first-year ice ridges were investigated in the Arctic Ocean from May 21st to June 23rd 2015. The macro-porosities were obtained by mechanical drilling averaged over several boreholes along a drill transect. For two of the ridges, the drilling was repeated along the same transect, with approximately a week between measurements. From the repeated measurements, the rubble macro-porosity decreased as the melting progressed. The most severe decrease occurred in the smallest and youngest ridge. Furthermore, a gradation curve for the ice block length over the thickness ratio was obtained for one ridge sail. This measurement was used to qualitatively evaluate the initial rubble macro-porosity before consolidation. Additionally, the drilling hardness was measured. The decrease in hardness followed the increase in temperature. Vertical ice cores tested in-situ under uniaxial compression agreed with the registered drilling hardness.
File Size : 1,009,417 bytes
File Type : Adobe Acrobat Document
Chapter : Ice Research and Engineering
Category : 23rd Symposium USA (2016)
Article : Sea Ice
Date Published : 20/10/2016
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