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Articles

1975: Vol. LII, No. 1

A Method of Presenting the Predicted Tides of a Mixed Type with Strong Diurnal Influence

Soumise
août 7, 2015
Publié-e
2015-07-07

Résumé

The data most widely used in presenting the variation of tides are the high and low tides. The curve between the high tide and the low tide can be satisfactorily described by a cosine function if the shallow water distortion is negligible; otherwise the cosine function can be replaced by a polynomial series with coefficients determined by regression analysis. For mixed tides with large diurnal influence, however, the shape of the curve between the low tide and the high tide changes from day to day. In this report, a method has been developed on how to divide the curve into segments so that each can be described by a cosine function. The following constraints are applied to the method to achieve a uniformity of the format in tidal publication: 1. The sequence of the high and low tide must not be altered by the inclusion of additional points between them. 2. The total number of points, including the high tide and the low tide in a day, must not be more than four (4).