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A comparison of all the different approaches to analyze the problem of wave spectrum change on a sloped beach is presented. It is shown how the heuristic, theoretical and numerical formulations compare or differ. It is shown that the transformation of a deep water directional spectrum into a shallow water directional spectrum can be done with little more effort than computing a one-dimensional spectrum by development of an inverse direction function only.
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Méhauté et al. (1982) studied this question.
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