Analysis of Tidal Data for Dagang Tidal Gauge and Study of the Changes for the National Height Datum

doi:10.11947/j.AGCS.2015.20140110

Abstract

Abstract: The main tides affecting Dagang sea level are analyzed and the national height datum is studied by analyzing 1980—2011 hourly tidal data and 1952—2007 monthly mean tidal data. Firstly, the frequencies and amplitudes of main tides including 180 short-period tides and 6 long-period tides are gained by the Fouirer transform. Then the actual amplitudes and their variations of main tides are obtained by the harmonic analysis of the 1980—2011 hourly tidal data, and the changes with about 19 year period can easily be found in the amplitudes of Q₁、O₁、M₂、K₁、K₂. And then the changes of the mean sea level at Dagang tidal gauge defining national height datum during the period of 1952—2011 are studied by the harmonic analysis and the shifting average of 18.61 year tidal heights. The results of these methods show that the mean sea level at Dagang tidal gauge descended with the speed of 1.07 mm/a and 0.76 mm/a respectively during 1952—1980, and that it ascended with the speed of 1.59 mm/a and 1.62 mm/a respectively during 1980—2011. And finally the difference of 0.14 cm is achieved by the shifting average of 18.61 year tidal heights for 1985 National Height Datum.

Key words: mean sea level, height datum, tidal gauge, frequency-amplitude analysis

CLC Number:

P228

WU Fumei, WEI Ziqing, LI Yingchun. Analysis of Tidal Data for Dagang Tidal Gauge and Study of the Changes for the National Height Datum[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(7): 709-716.

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