COUPLED NUMERICAL SIMULATION ON WAVE AND STORM SURGE IN COASTAL AREAS UNDER STRONG TYPHOONS

Extreme met-ocean conditions, such as strong wind, huge wave and storm surge in the near-shore areas, generated by strong typhoons pose a great threat to the safety of coastal engineering structures such as sea-crossing bridges. Superimposing the Holland model wind field with Miyazaki model wind field and ERA-Interim wind field, a typhoon wind field is firstly simulated. Then the applicability of different empirical formulas of maximum wind speed radius of the wind field is discussed. Finally, a SWAN+ADCIRC wave-current coupling model is driven to simulate the wave-storm surge evolution process in Taiwan Strait and the coastal areas under strong typhoon Maria (1808), and the characteristics of distribution of wave and storm surge in the coastal area are also discussed. In order to validate the feasibility and accuracy of the presented method, the numerical simulation of wind and wave is verified with measured data. Results show that the SWAN+ADCIRC model driven by superimposed a wind field and a TPXO tidal model can effectively simulate the generation and development process of wave and storm surge in coastal areas.