Author(s): Tony W. Dixon; Vernon A. Squire
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Keywords: No Keywords
Abstract: A new approach is used to model ocean wave scattering in a marginal ice zone composed of random ice floes of predefined width and thickness, present at a specified concentration. The method used, the Coherent-Potential Approximation (CPA) modified to allow for intermediate frequencies, creates a ficticious effective medium made up of 'coated scatterers' that cover the entire ice field. A simple ice constitutive relation is used to demonstrate the method, but more general material behaviour is envisaged for a future model. The improved CPA is used to compute the energy transport velocity and the coherence properties of the waves as functions of wave number. The results show that it is possible for a. n MIZ to suppress certain bands of wave numbers where waves become localized, and for the scattering medium to exclude waves entering obliquely at the ice margin in some situations.
Year: 1998