Wave propagation in continuous sea ice:An experimental perspective

Passerotti, Giulio, Alberello, Alberto ORCID: https://orcid.org/0000-0001-7957-4012, Dolatshah, Azam, Bennetts, Luke, Puolakka, Otto, Von Bock Und Polach, Franz, Klein, Marco, Hartmann, Moritz, Monbaliu, Jaak and Toffoli, Alessandro (2020) Wave propagation in continuous sea ice:An experimental perspective. In: Polar and Arctic Sciences and Technology. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE . American Society of Mechanical Engineers (ASME), Virtual, Online. ISBN 9780791884393

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Ocean waves penetrate hundreds of kilometres into the icecovered ocean. Waves fracture the level ice into small floes, herd floes, introduce warm water and overwash the floes, accelerating ice melt and causing collisions, which concurrently erodes the floes and influences the large-scale deformation. Concomitantly, interactions between waves and the sea ice cause wave energy to reduce with distance travelled into the ice cover, attenuating wave driven effects. Here a pilot experiment in the ice tank at Aalto University (Finland) is presented to discuss how the properties of irregular small amplitude (linear) waves change as they propagate through continuous model sea ice. Irregular waves with a JONSWAP spectral shape were mechanically generated with a very low initial wave steepness to avoid ice break up and maintain a consistent continuous ice cover throughout the experiments. Observations show an exponential attenuation of wave energy with distance. High frequency components attenuated more rapidly than the low frequency counterparts, in agreement with a frequency-cubed power-law. The more effective attenuation in the high frequency range induced a substantial downshift of the spectral peak, stretching the dominant wave component as it propagates in ice.

Item Type: Book Section
Additional Information: Funding Information: The experiments in the Aalto ice tank were supported by HYDRALAB+ program (contract no. 654110). Support from the Australia–Germany Joint Research Cooperation Scheme (DAAD, project 5744547) and the Australian Antarctic Science Program (project 4434) is acknowledged. This work was partially funded by the ACE Foundation and Ferring Pharmaceuticals. GP, AA, AD and AT acknowledge support from the Air-Sea-Ice Lab Project. Publisher Copyright: © 2020 American Society of Mechanical Engineers (ASME). All rights reserved.
Uncontrolled Keywords: ocean engineering,mechanical engineering,energy engineering and power technology ,/dk/atira/pure/subjectarea/asjc/2200/2212
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Depositing User: LivePure Connector
Date Deposited: 04 Dec 2021 01:45
Last Modified: 22 Oct 2022 23:55
URI: https://ueaeprints.uea.ac.uk/id/eprint/82559

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