Overtide
Overtide : A harmonic tidal (or tidal current) constituent with a speed that is an exact multiple of the speed of one of the fundamental constituents derived from the development of the tide-producing force. The presence of overtides is usually attributed to shallow water conditions. The overtides usually considered in tidal work are the harmonics of the principal lunar and solar semidiurnal 2 2 constituents M and S , and are designated by the symbols M468 4 6 , M, M , S , S , etc. The magnitudes of these harmonics relative to those of the fundamental constituents are usually greater in the tidal current than in the tide
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