Abstract
A two dimensional, irrotational, linear theory is used to investigate the reflexion of an incident surface gravity wave travelling over a region of varying depth. The existence of a unique velocity potential is proved for general bottom profiles in two limiting cases, when the wavelength is either small compared with the depth or large compared with the transition width. The associated asymptotic results justify the approximations obtained by others using formal methods. Also, the class of bottom profiles for which numerical results can be achieved is extended.

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