Author(s): Dharma Sree; Adrian Wing-Keung Law; Hayley H. Shen

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Abstract: Continuum-based viscoelastic model considers wave dispersion and attenuation under large stretch of ice by assigning effective mechanical properties for the ice cover, whereas discrete floe model considers the scattering mechanisms. This research work inspects the combined effects of material properties, scattering mechanism, and hydrodynamics on surface wave modifications. The study is a continuation of the experimental approach developed by Sree et al. (2017; 2018), with the incorporation of discontinuities on floating viscoelastic covers. The covers with required rheological properties were first prepared using oil-doped polydimethylsiloxane and tested in an oscillatory rheometer. Ultrasound sensors installed along a wave flume then recorded the surface elevation at various locations of the cover under wave action. These data were used to analyze wave dispersion and associated wave attenuation. With segmentation, notable change in wavenumber was obtained in terms of switching from wave lengthening to shortening for stiff and thick covers. The experimental results were compared with an existing theoretical model on segmented floating elastic cover; an empirical relation was also derived based on attenuation data (Sree et al. 2020). In this talk, we will present a summary of and the outlook from these results.

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Year: 2020