Numerical simulation of 3-D tidal current under the actions of typhoon waves and storm surge

In order to solve the problem of 3-D tidal current simulation under a typhoon, a method of numerical simulation of wave-current coupling is presented in this paper. First, based on the wind field of Typhoon Wipha in a triple-nested grid with high resolution, the following were applied: the third generation wave model; 2-D tidal current model; 3-D hydrodynamic and sediment model FVCOM; and the 2-D and 3-D unstructured grid triple-nested model. Through secondary development, shear stress at the bottom of the 3-D model, under the combined action of wave-current coupling, was virtually solved. A 3-D tidal current mathematical model of wave-current coupling under typhoon action was developed. Wave-current-coupled 3-D tidal current process in the Lianyungang Sea area, under the influence of Typhoon Wipha in 2007, was simulated. Finally, calculations of the different layout plans of Lianyungang port were carried out. Results showed that there was little difference in flow pattern and flow velocity for all layout plans in the Qitai port area. With increasing reclamation in the Xuwei port area, the phenomenon of large-scale rotational flow gradually disappeared, and flow velocity decreased. This data can provide technical support for the design of a 300,000 t channel project in Lianyungang port. © 2019, Editorial Department of Journal of HEU. All right reserved.