Journal of Tropical Oceanography >
Analysis on the influencing factors of storm surges near Shenzhen
Copy editor: LIN Qiang
Received date: 2021-09-15
Revised date: 2021-10-30
Online published: 2021-11-03
Supported by
Shenzhen Peacock Plan(KQJSCX20170720174016789)
Storm surge can cause huge damages to a coastal city. Shenzhen, as a mega-city in terms of economics and population, is located in the north coast of the South China Sea, where typhoons frequently happen. However, the research on storm surge near Shenzhen is limited. Based on the regional ocean model system (ROMS), a three-layer nested regional ocean model was developed to study influencing factors of storm surges in the coastal region of Shenzhen. First, the storm surge caused by Typhoon Mangkhut in 2018 was simulated and tested, and the simulation results are consistent with observations. Based on the case of Mangkhut, a series of experiments were carried out to study influences of landing location, size, intensity, and moving direction and speed on storm surge. Our results show that, under the same conditions, the maximum storm surge of a typhoon landing on the west of Shenzhen is about 1.5 m higher than that landing on the east of Shenzhen. The storm surge driven by the typhoon passing Shenzhen from east to west is about 1.0 m higher than that moving from south to north. If the radius of maximum wind of a typhoon is enlarged by 15%, the maximum storm surge increases by about 0.2 m. As the intensity of a typhoon goes up by 15%, the maximum storm surge increases by about 0.4 m. On the whole, the translation speed of a typhoon has only weak influence on storm surge, and its influence on storm surges is related to the landing location. If a typhoon makes landfall to the west or east of Shenzhen, and the moving speed of the typhoon increases by 30%, the maximum storm surge in each bay along the Shenzhen coast increases by 0.2 to 0.6 m. If a typhoon passes through each bay of Shenzhen successively, and the moving speed of a typhoon increases by 30%, the maximum storm surge in the Pearl River Estuary decreases by about 0.1 m, and that in Dapeng Bay and Daya Bay increases by about 0.2 m. This is related to the time for the water mass redistribution to return to its a steady state within a bay and the forcing time of the typhoon.
Key words: Shenzhen; storm surge; numerical modelling
DENG Guotong , LIU Mincong , XING Jiuxing , SHENG Jinyu , ZHOU Kai , CHEN Shengli . Analysis on the influencing factors of storm surges near Shenzhen[J]. Journal of Tropical Oceanography, 2022 , 41(3) : 91 -100 . DOI: 10.11978/2021124
表1 台风登陆角度与登陆点试验编号Tab. 1 Case numbers of different typhoon landing angles and locations |
登陆点 | 登陆角度 | |||||
---|---|---|---|---|---|---|
0° | 15° | -15° | -30° | -60° | -90° | |
西登陆点 | A1 | A2 | A3 | A4 | A5 | A6 |
中登陆点 | B1 | B2 | B3 | B4 | B5 | B6 |
东登陆点 | C1 | C2 | C3 | C4 | C5 | C6 |
表2 深圳沿海各海湾水体重新分布时间Tab. 2 The time of redistribution of water bodies in each bay along the Shenzhen coast |
海湾 | L/km | h/m | Ts/h |
---|---|---|---|
珠江口 | 50 | 8.68 | 3.82 |
大鹏湾 | 25 | 8.49 | 0.98 |
大亚湾 | 25 | 6.32 | 1.31 |
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