Author(s): Xin Zhao; Christopher Callinan; Hayley Shen
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Abstract: Both wavelength and amplitude, as well as the directional distribution of energy, change as waves propagate under ice covers. These changes depend on the wave frequency and the properties of the ice cover. There are several theories for these phenomena, but very limited data to validate these theories. In 2008 a laboratory study at the Hamburgische SchiffbauVersuchsanstalt Gmb H (HSVA) the wave dispersion, including both wavelength change and wave attenuation, was measured for a grease/pancake ice field. The results were compared to those from a grease ice field formed in a smaller wave tank at the University of Washington. It was shown that wave propagation under a grease ice cover followed that of a viscous layer model, but under a pancake ice field they did not. A more extensive study was conducted again in 2013 at HSVA to further investigate the dispersion relationship. These laboratory studies demonstrated their potential to aid the development of wave-ice theories. They can supplement field studies to help characterize the wave behavior under different ice covers. A companion paper (Part I) in this Proceedings details the 2013 HSVA experiment set up and data collection. The preliminary analysis is presented here to outline the procedure of inversely determining the parameters for a viscoelastic wave-ice model. A scaling law is proposed to connect laboratory data directly to field conditions.
Year: 2014