Using the new set of constituents, the standard deviations of the residuals are reduced on average by 2.41 % (times) and 2.30 % (heights) for the year 2016. The effect of these changes has been studied by comparing predictions with observations from 98 tide gauges. Nine constituents are added and 13 partial tides, mostly in the close neighbourhood of strong spectral components, are removed. The new set of 39 partial tides largely confirms the previously used set with 43 partial tides. through manual inspections of long time series data. One comprehensive list of partial tides is realized by combining the separate frequency analyses and by applying subsequent improvements, e.g. This article documents the preparation of a constituents list for the operational application of the harmonic representation of inequalities.įrequency analyses of observed heights and lunitidal intervals of high and low water from 111 tide gauges along the German North Sea coast and its tidally influenced rivers have been carried out using the generalized Lomb–Scargle periodogram. With this technique, the deviations of heights and lunitidal intervals, especially of high and low waters, from their respective mean values are represented by superpositions of long-period tidal constituents. The harmonic representation of inequalities (HRoI) is a procedure for tidal analysis and prediction that combines aspects of the non-harmonic and the harmonic method.
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