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  • 1
    Publication Date: 2016-04-08
    Description: The envelope of narrow-banded, periodic, surface-gravity waves propagating in one dimension over water of finite, non-uniform depth may be modeled by the Djordjević and Redekopp [“On the development of packets of surface gravity waves moving over an uneven bottom,” Z. Angew. Math. Phys. 29 , 950–962 (1978)] equation (DRE). Here we find five approximate solutions of the DRE that are in the form of Jacobi-elliptic functions and discuss them within the framework of ocean swell. We find that in all cases, the maximum envelope-amplitude decreases/increases when the wave group propagates on water of decreasing/increasing depth. In the limit of the elliptic modulus approaching one, three of the solutions reduce to the envelope soliton solution. In the limit of the elliptic modulus approaching zero, two of the solutions reduce to an envelope-amplitude that is uniform in an appropriate reference frame.
    Print ISSN: 1070-6631
    Electronic ISSN: 1089-7666
    Topics: Physics
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