| Abstract: |
| Taiwan suffered several typhoons every single year. The change in pressure and strong winds caused by typhoons have a great impact on the wave motion characteristics near Taiwan. Current can have significant influences to the wave characteristics. Tree consequtive typhoons, i.e. Meranti(12-15/09/2016), Malakas(15-18/09/2016) and Megi(25-28/09/2016), passing through the souther tip of Taiwan in September 2016. An extreme wave was recorded by an off-shore bouy in the seas of Nanwan Bay. In order to study the wave-current interactions during these typhoon period, an wave model(WWM) is coupled with a current model (SCHISM). The coupled model is based on an unstructured grid (tri-angular FEM) system which is suitable for high-resolution coastal studies. The wind field data from the weather forecasts(WRF) done by Central Weather Bureau. The coupled model results are shown to be able to capture the wave-current interactions in Nanwan bay. Results shows that the wavelength becomes shorter in the opposing current, which lead to the increasing of wave number. Consequently, Wave height and wave steepness are also getting higher due to the changes of the wave number. |
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