Journal of Marine Sciences ›› 2023, Vol. 41 ›› Issue (4): 21-31.DOI: 10.3969/j.issn.1001-909X.2023.04.003

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Numerical investigation of the super typhoon Mangkhut based on the coupled air-sea model

LÜ Zhao1(), WU Zhiyuan1,2,3,*(), JIANG Changbo1,3,4, ZHANG Haojian1, GAO Kai1, YAN Ren1   

  1. 1. School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China
    2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of technology, Dalian 116024, China
    3. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China
    4. School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China
  • Received:2022-12-20 Revised:2023-03-20 Online:2023-12-15 Published:2024-01-30


Based on the mesoscale atmospheric model WRF and the regional ocean model ROMS, a two-way coupled WRF-ROMS air-sea model was constructed to simulate the super typhoon Mangkhut in 2018. The results showed that the simulation results of the coupled air-sea model were better than those of the only atmospheric or ocean model, and the error of the typhoon track obtained from the coupled model was within 60 km, which was in good agreement with the best track. Compared with the observation results, the simulation results of wind speed and sea level pressure in the coupled model were better than others model. Based on the simulation results of the coupled air-sea model, the spatial and temporal distribution of the wind field, pressure field, sea surface flow field, and storm surge under the super typhoon Mangkhut were further analyzed. The results showed that: (1) In terms of spatial distribution, after the typhoon entered the South China Sea, the radius of the seven-level wind circle was larger behind the right side of the typhoon; the cyclonic flow field showed a significant Ekman effect with the typhoon wind field, and the flow direction was 45° from the wind direction. The wind field, pressure field, wind-generated flow field and water gain distribution all had obvious asymmetry, and the typhoon intensity, flow velocity and water gain were greater on the right side of the typhoon path than on the left side. (2) In terms of time distribution, the distribution of the wind field and the pressure field were similar and synchronized with the typhoon center, while the wind-driven flow field and storm surge were three hours behind the typhoon track.

Key words: coupled air-sea model, storm surge, numerical simulation, the South China Sea, super typhoon Mangkhut

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