METHOD OF PLOTTING TIDAL CHARTS Russian patent published in 2012 - IPC G01C11/00 

FIELD: physics.

SUBSTANCE: method of making tidal charts involves determination of tidal height from a harmonic wave component bounded on the periphery of the water body, given by amplitude, position angle and period, and further processing, wherein the tidal height is determined taking into account angular velocity of the harmonic wave component, where real plane coordinates of points of the water body directed east and north, respectively, are determined, and tidal height values of the harmonic wave component at a fixed moment in time are determined through the projection of a point on a phase circle corresponding to said sea level, parameters of which are determined taking into account location of inner points of the water body and its periphery, and the oscillation amplitude of the harmonic wave component is determined from tidal height values at points with real plane coordinates for a sequential set of discrete time values, from the value of which the time for maximum tidal height is determined. Formation of observation rows in the disclosed method is carried out through decomposition of the oscillation spectrum at non-overlapping intervals and decomposition of the original row into components for each frequency interval, and harmonic constant estimation is carried out for each separate glow, wherein further estimation of stability of harmonic constants is performed, non-periodic tidal oscillations are determined, when constructing isolines, a proximity measure between two systems of isolines is determined, by constructing a Hausdorff metric, the time and spatial variability of the age of the tide between amphidromic points on the isolines is determined.

EFFECT: easier tidal chart plotting and high reliability of said charts.

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