An experimental model of wave attenuation in pancake ice

Alberello, Alberto, Nelli, Filippo, Dolatshah, Azam, Bennetts, Luke G., Onorato, Miguel and Toffoli, Alessandro (2019) An experimental model of wave attenuation in pancake ice. In: Proceedings of the 29th International Ocean and Polar Engineering Conference, ISOPE 2019. Proceedings of the International Offshore and Polar Engineering Conference. International Society of Offshore and Polar Engineers, USA, pp. 751-756. ISBN 9781880653852

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Abstract

In the winter, when the Antarctic sea ice cover is expanding, the far edge of the marginal ice zone is populated by small floes with characteristic diameters much smaller than ocean wavelengths and known as pancake ice. This form of sea ice was once only typical of Antarctic waters, but it is now observed in the Arctic due to the intensification of the wave action following ice retreat. Despite recent studies, the governing physics controlling how waves propagate through pancake ice is not understood. To cast new light on the propagation of waves in ice. an experimental model was setup in the Sea Ice Wind Wave Interaction (SIWWI) flume at the University of Melbourne, which allows operations at sub-zero temperatures. To simulate pancakes, the ice cover was modelled using ice cubes with characteristic dimension of a few centimeters (much smaller than the generated wavelength) and different concentrations. Experiments consisted of tracking the propagation of regular and irregular wave fields along the flume to monitor the dissipative effect of the ice cover. Results indicate that wave attenuation depends on ice concentration, with as low as 20 - 40% of energy going through high density covers. Although observations reveal that the ice cover attenuates wave energy over the entire spectrum, energy attenuation is more effective at high frequencies, inducing a significant downshift of the spectral peak.

Item Type: Book Section
Additional Information: Funding Information: The Australian Research Council funded the facility (LE140100079). AA and AT were funded by the Antarctic Circumnavigation Expedition Foundation and Ferring Pharmaceuticals. The authors acknowledge Prof. J. Monty (University of Melbourne) for facilitating access to the experimental facility. AD is supported by Swinburne University Postgraduate Research Award and Nortek AS. AA, AD, FN and AT acknowledge support from the Air-Sea-Ice Lab Project. Publisher Copyright: © 2019 by the International Society of Offshore and Polar Engineers (ISOPE).
Uncontrolled Keywords: marginal ice zone,sea ice,wave-ice interaction,waves-in-ice,energy engineering and power technology,ocean engineering,mechanical engineering ,/dk/atira/pure/subjectarea/asjc/2100/2102
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Depositing User: LivePure Connector
Date Deposited: 04 Dec 2021 01:46
Last Modified: 25 May 2022 13:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/82561
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