Study of medium-frequency waves from tide gauges and sea-bed pressure sensors round Shetland show a seiche of 50 cycles per day, confined to the east coast, and a curious enhancement of the 6th harmonic of the twice-daily tide, prominent only near the edge of the continental shelf. Explanations of both are offered in terms of trapped edge-waves.
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Cartwright et al. (1974) studied this question.
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