Study on hydrodynamic characteristics in the eastern part of Liaodong Bay Mouth based on long-term observation

Zhao Qian; Wang Mengjia; Ding Dewen; Chen Weibin

doi:10.3969/j.issn.0253-4193.2016.01.003

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Zhao Qian, Wang Mengjia, Ding Dewen, Chen Weibin. Study on hydrodynamic characteristics in the eastern part of Liaodong Bay Mouth based on long-term observation[J]. Haiyang Xuebao, 2016, 38(1): 20-30. doi: 10.3969/j.issn.0253-4193.2016.01.003

Citation:

Zhao Qian, Wang Mengjia, Ding Dewen, Chen Weibin. Study on hydrodynamic characteristics in the eastern part of Liaodong Bay Mouth based on long-term observation[J]. Haiyang Xuebao, 2016, 38(1): 20-30. doi: 10.3969/j.issn.0253-4193.2016.01.003

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Study on hydrodynamic characteristics in the eastern part of Liaodong Bay Mouth based on long-term observation

doi: 10.3969/j.issn.0253-4193.2016.01.003

1.
Division of Marine Dynamics, National Marine Environmental Monitoring Center, Dalian 116023, China;Research Center for Island and Coast Zone, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, ChinaDivision of Marine Dynamics, National Marine Environmental Monitoring Center, Dalian 116023, China
3.
Research Center for Island and Coast Zone, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
4.
Division of Marine Dynamics, National Marine Environmental Monitoring Center, Dalian 116023, China

Received Date: 2015-02-04
Rev Recd Date: 2015-06-20

Abstract

Abstract

The sea area in the eastern part of Liaodong Bay Mouth is a key passage through which the mass and energy are exchanged between the Liaodong Bay and the central Bohai Sea. In this paper,based on the eight-month continuous observed data obtained from the seabed based platform,we firstly analyzed the characteristics of tide and tidal current,and then discussed the seasonal variation regularities of residual current and sea bottom temperature in the sea area by means of spectral and harmonic analysis. The results were shown as follows: the tide in the sea area was an irregular semi-diurnal one with the mean tidal range 0.95 m and the maximum possible tidal range 2.27 m,respectively. The tidal current was an irregular semi-diurnal one,and the M₂ tidal current constituent was dominant. The motion type of the principle tidal current constituents was rectilinear,with the maximum tidal velocity in the direction of southwest-northeast. The residual current showed remarkable seasonal features. In autumn,the residual current flowed southwestward and showed a parabolic-shaped profile,with the maximum velocity observed in the mid-layer. In winter,the residual current flowed in the direction of west-southwest with little variability of velocity in vertical. In spring,the residual current,showing a cyclonic spiral,was weakened from the surface to the bottom layers. Affected by tidal current,horizontal temperature gradient in the sea bottom and diurnal variation of SST,the high-frequency variation of bottom temperature was observed in the bottom layer. In autumn,the signal of semi-diurnal period was dominant,whereas in winter the signal of diurnal period was notable. These pulses of short-term variability were considerably suppressed in spring.
- Liaodong Bay,
- tidal current,
- residual current,
- bottom temperature,
- spectral analysis,
- harmonic analysis

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References(19)

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