Characteristics of the tide and tidal current off the Sanmen Bay

Abstract

Abstract: Based on the successive data of sea level and current velocity profiles obtained by two bottom-moored Acoustic Doppler Current Profilers (ADCP) from May to July of 2009 at D8 and D9 stations off the Sanmen Bay, the characteristics of tide and tidal current were investigated with power spectral analysis and harmonic analysis. The results show that the tide is regular semi-diurnal tide, shallow water tides at inshore area of D9 station is much more significant than that at offshore area of D8 station, and that the tide presents the characteristics of tropical tide. The semi-diurnal tidal currents off the Sanmen Bay are the strongest constituents, the tidal currents at different layers have the feature of rotary currents with the ellipticity increasing with depth, and the maximum velocity of both M₂ and K₁ constituents appears in subsurface. The occurrence of the maximum current in the bottom layer is about 30 minutes ahead of that in the middle and surface layers. The semidiurnal constituent in this area is mainly barotropic, while the diurnal one is of baroclinic feature.

Key words: harmonic analysis, tide, tidal current

CLC Number:

P731.2

SHI Peng-fei, XU Dong-feng, WANG Jun, XU Ming-quan. Characteristics of the tide and tidal current off the Sanmen Bay[J]. Journal of Marine Sciences, 2012, 30(2): 27-35.

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