Using astronomical tidal time difference for water correction

doi:10.11947/j.AGCS.2019.20180556

Abstract

Abstract: In order to solve the problem that there may be a big difference between the traditional method of water level correction using distance interpolation to calculate the tidal time difference (TTD) of the stations to be determined and the actual situation, this paper puts forward a method of water level correction using astronomical tide to directly calculate the tidal time difference between stations, studies the difference and variation of the tidal time system between astronomical tide and the measured water level of some coastal stations in China, and analyzes the deviation magnitude of the tidal time difference between two groups of adjacent stations with astronomical tide determined by different tidal numbers instead of the measured water level. Using tide gauge stations along the Yellow Sea and Beibu Gulf, the experiment of astronomical tide time difference water level correction is designed, and the effect of the traditional method and astronomical tide time difference method is compared. The experiment and analysis show that using astronomical tide to calculate the tidal time difference is closer to the measured tidal time difference than the traditional method, and the median error of the correction result of the 8 tidal constituents is controlled within 5 cm, nearly double that of the traditional method, realizing the improvement of the traditional method and proving the feasibility of using astronomical tide to correct the water level of the time difference method.

Key words: astronomical tide, astronomical tidal time difference, time difference method, water correction, inner-station TTD, inter-station TTD

CLC Number:

P229.3

LIU Ju, BAO Jingyang, XU Jun. Using astronomical tidal time difference for water correction[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(9): 1161-1170.

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