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ZENG Dingyong, NI Xiaobo, HUANG Daji. Harmonic analysis of tide and tidal current near Nanji Island, Zhejiang Province[J]. Haiyang Xuebao, 2012, 34(3): 1-10.
Citation:
ZENG Dingyong, NI Xiaobo, HUANG Daji. Harmonic analysis of tide and tidal current near Nanji Island, Zhejiang Province[J]. Haiyang Xuebao, 2012, 34(3): 1-10.
ZENG Dingyong, NI Xiaobo, HUANG Daji. Harmonic analysis of tide and tidal current near Nanji Island, Zhejiang Province[J]. Haiyang Xuebao, 2012, 34(3): 1-10.
Citation:
ZENG Dingyong, NI Xiaobo, HUANG Daji. Harmonic analysis of tide and tidal current near Nanji Island, Zhejiang Province[J]. Haiyang Xuebao, 2012, 34(3): 1-10.
State Key Laboratory of Satellite Ocean Environment Dynamics, The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
State Key Laboratory of Satellite Ocean Environment Dynamics, The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Department of Ocean Science and Engineering, Zhejiang University, Hangzhou 310058, China
Based on the observed water level and current data during the winter of 2008 at four bottom-moorings near Nanji Island, Zhejiang Province, the characteristics of tide and tidal current are investigated with spectral and harmonic analysis. Spectral analysis of the water level shows that the semi-diurnal tides are the most significant constituents, followed by diurnal tides, shallow water tides at inshore area are significant than that in offshore. Harmonic analysis of the water level shows that the tide is regular semi-diurnal tide, the average tidal range is over 3 m and the potential maximum tidal range is greater than 6m at inshore area. The tide has significant low tide daily inequality and tropical tide characteristics. Spectral analysis of the current shows that the semi-diurnal tidal currents are the most significant constituents, followed by diurnal tidal currents which are much weaker than the former, shallow water tidal current at inshore area is much more significant than that in offshore. Harmonic analysis of the current shows that the tidal current is regular semi-diurnal tidal current, the most significant semi-diurnal tidal current constituent is M2, with its maximum speed of 0.32-0.48 m/s,the most significant diurnal tidal current constituent is K1, with its maximum speed less than 0.06 m/s. The M2 tidal current rotates counter-clockwise, with increasing of its ellipticity as approaching to the sea floor. The maximum speed of M2 tidal current occurs at middle and upper layers, decreases towards the surface and the sea floor. The direction of the maximum tidal current of M2 does not vary significant with depth, except that the direction deviates slightly to the left near the sea floor. The timing of the maximum current advances when approaching to the sea floor, with about 30 minutes ahead at the bottom layer than the above layer. The semidiurnal tidal current is barotropic dominate with vertical homogeneous, while the diurnal tidal current shows a baroclinic property with a strong vertical variation.
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