Localization of gravity waves on a channel with a random bottom

We present a theoretical study of the localisation phenomenon of gravity waves by a rough bottom in a one-dimensional channel. After recalling localisation theory and applying it to the shallow-water case, we give the first study of the localisation problem in the framework of the full potential theory; in particular we develop a renormalised-transfer-matrix approach to this problem. Our results also yield numerical estimates of the localisation length, which we compare with the viscous dissipation length. This allows the prediction of which cases localisation should be observable in and in which cases it could be hidden by dissipative mechanisms.

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