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Wave Attenuation due to Ice Cover: An Experimental Model in a Wave-Ice Flume

[+] Author Affiliations
A. Dolatshah, F. Nelli, A. Alberello

Swinburne University of Technology, Hawthorn, Australia

L. Bruneau

Memorial University of Newfoundland, Newfoundland, NL, Canada

L. G. Bennetts

University of Adelaide, Adelaide, Australia

M. H. Meylan

University of Newcastle, Callaghan, Australia

J. P. Monty, A. Toffoli

University of Melbourne, Parkville, Australia

Paper No. OMAE2017-61548, pp. V008T07A016; 6 pages
doi:10.1115/OMAE2017-61548
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5776-2
  • Copyright © 2017 by ASME

abstract

Waves penetrate deep into the ice covered seas, inducing breakup of the ice cover. Concomitantly, the ice cover attenuates the wave energy over distance, so that wave impacts die out eventually. Observations of wave attenuation and concurrent wave-induced breakup in the literature are serendipitous due to difficulties in making measurements in ice covered seas. Hence understanding of wave-ice interactions remain uncertain. Here we present measurements of wave propagation through ice covered waters in the new experimental wave-ice facility at the University of Melbourne. The facility comprises of a 14m long and 0.76m wide flume in a refrigerated chamber, where temperatures can be lowered down to −12 degrees Celsius to generate a continuous ice cover on the water surface. A wave maker, installed at one end, is used to generate regular waves, ranging from gently-sloping to storm-like conditions. Wave attenuation rates are determined from video-camera images of the displacements of markers embedded in the ice cover. The experiments investigated wave propagation through the continuous ice cover, breakup, and propagation through the broken ice cover. Spatial evolution of the breakup and geometrical properties of floes are monitored and correlated with incident wave properties. Wave attenuation over broken ice is investigated and compared against the continuous ice case.

Copyright © 2017 by ASME
Topics: Waves , Flumes , Ice

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