Journal of Tropical Oceanography ›› 2023, Vol. 42 ›› Issue (6): 1-14.doi: 10.11978/2023017CSTR: 32234.14.2023017

Special Issue: 全球变化专题

• Marine Meteorology •     Next Articles

Storm surge simulations of the coastal area of Shenzhen using different types of typhoon meteorological fields—a case study of Typhoon Mangkhut*

ZHANG Zheran1(), HU Junyang2, ZHOU Kai2, ZHANG Penghui1, XING Jiuxing1, CHEN Shengli1()   

  1. 1. Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
    2. Shenzhen Marine Development Research and Promotion Center, Shenzhen 518034, China
  • Received:2023-02-10 Revised:2023-05-04 Online:2023-11-10 Published:2023-11-28
  • Supported by:
    Shenzhen Science and Technology Innovation Committee(WDZC20200819105831001); Guangdong Basic and Applied Basic Research Foundation(2022B1515130006)

Abstract:

Storm surges caused by typhoon seriously affect life and business in coastal areas, which is one of the most serious marine disasters that cause economic losses. Shenzhen is located on the edge of the northern South China Sea, which is vulnerable to typhoon induced storm surges. The study of Shenzhen offshore storm surges can not only promote understanding of the physical mechanisms of storm surges, but also has an important significance for the effective disaster prevention and reduction warning of coastal cities. In the process of storm surge modelling studies, a typhoon meteorological field is the key factor for the accuracy of storm surge model simulations. Based on the FVCOM (finite volume community ocean model) current model and SWAN (simulation wave nearshore) wave model, a regional storm surge and wave coupling model is established for the offshore area of Shenzhen. We use reanalysis of meteorological data (European center for medium weather forecasting, ECMWF), ideal typhoon model (Holland) and atmospheric model (weather research and forecast, WRF) as driving field conditions to simulate the storm surge process during Typhoon Mangkhut. The main conclusions are as follows: the low resolution ECMWF reanalysis meteorological data is difficult to accurately reflect the horizontal structures of typhoon, which leads to simulation errors. Overall, Holland meteorological field can accurately simulate Typhoon Mankhut, but it cannot reproduce the structural deformation of typhoon in the coastal region, which results in high simulated storm surge water levels in and around Shekou (Shenzhen Bay, inside the Pearl River Estuary). WRF has a good simulation effect on wind speeds, air pressure fields, water levels and waves as a whole. WRF is a good solution to the problem of high storm surge levels in Holland near the typhoon landfall. The quantitative improvement of WRF in the Pearl River Estuary and Shenzhen Bay area can reach about 20%~30%. In the future storm surge study, if the Holland meteorological field is used, care should be taken into simulation results of the above areas. In addition, both Holland and WRF have good wave simulation results.

Key words: coastal area of Shenzhen, Typhoon Mangkhut, typhoon meteorological fields, storm surges, numerical simulations