Journal of Tropical Oceanography >
Analysis of tidal current and tidal energy on the west coast of Guangdong Province based on High Frequency Ground Wave Radar observation
Received date: 2017-11-15
Request revised date: 2017-12-19
Online published: 2018-10-13
Supported by
National Special Scientific Equipment Development Project (2013YQ16079303)
Frontier Science Research Project of Chinese Academy of Sciences (Grant No. QYZDJ-SSW-DQC022)
National Natural Science Foundation of China (41576003, 41506022)
Science and Technology Planning Project of Guangdong Province (2016A020224003)
Copyright
We study the characteristics of tidal current on the west coast of Guangdong Province using the surface current data observed by a High Frequency Ground Wave Radar (HF radar). Tidal harmonic analysis results show that the tide in this area mostly belongs to irregular semidiurnal tide, and the shallow water components are not negligible. The M2 tidal current is mainly counterclockwise reciprocating flow. The direction is along the northwest-southeast. In the near-shore region, tidal energy flux spreads to the shore. The tidal energy flux is from east to west in the east part of the study area. Through tidal energy budget analysis, we found that high dissipation appears in the west part of the study area, which has a lot of islands there is related to the existence of the Qiongzhou Strait and the topography on the west coast of Guangdong Province.
ZHU Huaixin , ZU Tingting , LI Jian , SHU Yeqiang , CHEN Ju , WANG Dongxiao . Analysis of tidal current and tidal energy on the west coast of Guangdong Province based on High Frequency Ground Wave Radar observation[J]. Journal of Tropical Oceanography, 2018 , 37(5) : 25 -32 . DOI: 10.11978/2017124
Fig. 1 Topography and observation stations at Guangzhou Bay图1 粤西高频地波雷达观测区域水深分布和潜标布放站位 |
Fig. 2 Velocity comparison between HF radar and ADCP data: (a) zonal velocity and (b) meridional velocity图2 高频地波雷达和ADCP观测流速u分量(a)和v分量(b)对比时间序列图 |
Fig. 3 Distribution of tidal characteristic values (F-G) on the west coast of Guangdong Province图3 表层特征值F(a)和G(b)的空间分布以及表层F-G散点分布图(c) |
Tab. 1 Harmonic constants at Station Q0 by ADCP and HF radar表1 Q0站的调和常数对比 |
观测仪器 | O1 | K1 | M2 | S2 | M4 | MS4 | 特征值 F | 特征值G | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
长轴/(m·s-1) | 迟角/(°) | 长轴/(m·s-1) | 迟角/(°) | 长轴/(m·s-1) | 迟角/(°) | 长轴/(m·s-1) | 迟角/(°) | 长轴/(m·s-1) | 迟角/(°) | 长轴/(m·s-1) | 迟角/(°) | |||
ADCP | 0.129 | 232 | 0.104 | 252 | 0.219 | 232 | 0.077 | 282 | 0.024 | 216 | 0.013 | 269 | 1.06 | 0.17 |
雷达(6月) | 0.116 | 207 | 0.061 | 224 | 0.191 | 234 | 0.063 | 280 | 0.012 | 193 | 0.016 | 209 | 0.93 | 0.15 |
雷达(11月) | 0.102 | 220 | 0.094 | 250 | 0.129 | 229 | 0.065 | 64 | 0.015 | 150 | 0.014 | 119 | 1.52 | 0.22 |
Fig. 4 Tidal current ellipses of the M2 tide (a) and O1 tide (b)图4 M2分潮(a)和O1分潮(b)潮汐椭圆分布图 |
Fig. 5 Vectors of tidal energy flux P. (a) June 14th-19th, 2015 and (b) November 1st-30th, 2014图5 粤西海域潮能通量P |
Fig. 6 Divergence of tidal energy flux C (a), the work rate by the nonlinear interaction N (b) and tidal dissipation D (c)图6 粤西海域潮能通量散度C(a)、非线性项N(b)和潮能耗散D(c)(单位均为(W·m-2) |
The authors have declared that no competing interests exist.
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