Definition
A gulf or shelf sea behaves as an oscillating body of water with a natural period approximated by Merian's formula, T equals 4L divided by the square root of gd for a basin open at one end, where L is length and d depth. Where this approaches 12.42 hours the M2 tide is strongly amplified; the Bay of Fundy reaches ranges above 15 m, and the Bristol Channel exceeds 12 m at springs.
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