Mechanism analysis of alongshore shock current phenomenon in Yangjiang sea area along the coast of western Guangdong in spring and summer

Chen Yizhan; Cao Yonggang; Luo Shihao; Liao Shizhi; Deng Dan; Liu Yuqiang; Ma Yuan

doi:10.12284/hyxb2022115

Volume 44 Issue 11

Nov. 2022

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Chen Yizhan，Cao Yonggang，Luo Shihao, et al. Mechanism analysis of alongshore shock current phenomenon in Yangjiang sea area along the coast of western Guangdong in spring and summer[J]. Haiyang Xuebao，2022, 44(11)：1–11 doi: 10.12284/hyxb2022115

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Mechanism analysis of alongshore shock current phenomenon in Yangjiang sea area along the coast of western Guangdong in spring and summer

doi: 10.12284/hyxb2022115

Chen Yizhan^{1, 2
,},
Cao Yonggang^{1, 2
,
,},
Luo Shihao¹,
Liao Shizhi¹,
Deng Dan¹,
Liu Yuqiang¹,
Ma Yuan¹

1.
South China Sea Marine Survey Center, Ministry of Natural Resources, Guangzhou 510300, China
2.
Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou 510300, China

Received Date: 2021-12-14
Rev Recd Date: 2022-06-07

Available Online: 2022-07-21

Publish Date: 2022-11-03

Abstract

Abstract

We can discover that there exist storm currents along Yangjiang sea area of western Guangdong waters in spring and summer of 2019 by analyzing materials which measure hydrologic and hydrometeorological along west coast of Guangdong flow Yangjiang sea area from 2018 to 2019. The result of research shows: Firstly, the velocity of 2 m water depth at the observation site reached 164.7 cm/s and 9 m water depth at the observation site reached 127.6 cm/s at 6:00 a.m. on May 5, 2019. The velocity of Yangjiang Shapa sea area 2 m water depth at the observation site reached 161.8 cm/s and 9 m water depth at the observation site reached 156.6 cm/s at 4:00 to 5:00 a.m. on August 1, 2019. Secondly, the suddenly strong currents in spring and summer have typically shock current trait in the Yangjiang 20 m to 30 m sea area along the shore current area of western Guangdong. The strong current happens at the surface of the ocean during the time of rising tide for 2 h to 4 h. Thirdly, during the transition period of southwest wind and northeast wind, the coastal sea area of western Guangdong is prone to form a water convergence zone. The sea level of the coastal sea area rises, and the sea level of the offshore sea area drops. The strong horizontal pressure gradient force from the shore to the outside causes the coastal water to strengthen the westward movement, resulting in shock current.
- the west of Guangdong Province,
- alongshore current,
- ocean shock current,
- sea water convergence zone,
- horizontal pressure gradient force

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References

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