This paper deals with the effect of viscosity on long gravity waves of small but finite amplitude. In a previous paper, Kakutani and the present author derived a simple equation concerned with this problem. Initial value problems for this equation are solved numerically. The results are compared with the experiments made by Zabusky and Galvin. By expanding the free surface elevation into Fourier series, each component is investigated separately. The temporal variations of the Fourier components together with those of the wave energy are computed.
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Kazuo MATSUUCHI (1976) studied this question.
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