Journal of Tropical Oceanography >
Characteristics of currents in northwest of Honghai Bay
Received date: 2017-12-27
Request revised date: 2018-01-23
Online published: 2018-10-13
Supported by
Key Project of Natural Science Foundation of China (41430964)
Key Research Program of Frontier Sciences CAS (QYZDJ-SSW-DQC034)
Copyright
Based on the data observed during the summer and winter cruises in 2008, the type and the motion form of tidal currents, the characteristics of flood current, ebb current and the residual current in the Northwest Honghai Bay were analyzed. The results show that the tidal property in the Northwest Honghai Bay belongs to irregular semidiurnal tide. The tidal current is a reversing current with a rotary current, mainly in the east-west direction. The current is mostly affected by wind and topography. The maximum averaged velocities during flood tide and ebb tide are, respectively, 17.8 and 19.3 cm·s-1. Under the northerly wind and southerly wind, the residual current flows west by south and east by north, respectively. The maximum residual current can reach 18.9 cm·s-1. The tidal energy flux propagates from east to west in the area, whose maximum value is about 4.8×103 W·m -1.
Key words: Honghai Bay; current; tidal residual current
LIU Guangping , HE Weihong , ZOU Xiaoli , WANG Zhaozheng , SUN Tianshan . Characteristics of currents in northwest of Honghai Bay[J]. Journal of Tropical Oceanography, 2018 , 37(5) : 40 -49 . DOI: 10.11978/2017133
Fig. 1 Observation stations and topography in the study area图1 研究海区观测站位及水深图 |
Tab. 1 Observation times in summer and winter表1 夏季和冬季观测时间 |
季节 | 大潮 | 中潮 | 小潮 |
---|---|---|---|
夏季 | 2008-8-30 8:00— 2008-8-31 9:00 | 2008-9-2 14:00— 2008-9-3 15:00 | 2008-9-6 12:00— 2008-9-7 13:00 |
冬季 | 2008-12-12 12:00— 2008-12-13 13:00 | 2008-12-9 10:00— 2008-12-10 11:00 | 2008-12-6 8:00— 2008-12-7 9:00 |
Fig. 2 Wind vectors at stations V8 (a) and V5 (b) during observations. S, M, and N represent spring tide, moderate tide and neap tide, respectively图2 观测期间V8站(a), V5(b)站风矢量图 |
Fig. 3 Averaged velocity during the flood tide in summer 2008. Surface (a), middle (b) and bottom (c) layers in the spring tide; surface (d), middle (e) and bottom (f) layers in the moderate tide; surface (g), middle (h) and bottom (i) layers in the neap tide图3 夏季涨潮期平均流矢图 |
Fig. 4 Same as |
Fig. 5 Same as |
Fig. 6 Same as |
Tab. 2 Tidal current characteristics at 10 stations表2 各测站潮流特征值 |
层次 | V1 | V2 | V3 | V4 | V5 | V6 | V7 | V8 | V9 | V10 |
---|---|---|---|---|---|---|---|---|---|---|
表层 | 1.94 | 1.87 | 2.13 | 1.48 | 1.35 | 1.13 | 2.68 | 1.11 | 1.21 | 1.23 |
中层 | 1.73 | 1.77 | 1.78 | 1.44 | 1.26 | — | 1.40 | 0.89 | 1.22 | 1.25 |
底层 | 2.67 | 1.99 | 1.87 | 1.52 | 1.26 | 1.77 | 1.78 | 1.05 | 1.00 | 1.05 |
Fig. 7 O1, K1 and M2 tidal current ellipses at 10 stations. O1 tidal current ellipses at surface (a), middle (b) and bottom(c) layers; K1 tidal current ellipses at surface (d), middle (e) and bottom(f) layers; M2 tidal current ellipses at surface (g), middle (h) and bottom(i) layers图7 O1、K1、M2分潮潮流椭圆示意图 |
Fig. 8 Tidal residual current in summer 2008. Surface (a), middle (b) and bottom (c) layers in the spring tide; surface (d), middle (e) and bottom (f) layers in the moderate tide; surface (g), middle (h) and bottom (i) layers in the neap tide图8 夏季余流图 |
Fig. 9 Same as |
Fig. 10 Vectors of tidal energy flux. Spring tide (a), moderate tide (b) and neap tide (c) in summer; spring tide (d), moderate tide (e) and neap tide (f) in winter图10 红海湾西北海区潮能通量 |
The authors have declared that no competing interests exist.
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[6] |
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[7] |
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[8] |
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[9] |
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[10] |
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[11] |
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[12] |
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[13] |
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[14] |
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[15] |
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[16] |
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[17] |
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[18] |
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[19] |
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