Spectral wave modelling of Typhoon Krosa
- 1Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
- 2Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan
- 3Institute for Hydraulic Engineering and Water Resources Management, Technische Universität Darmstadt, Rundeturmstr. 1, Darmstadt 60483, Germany
- 4Department of Environmental Resources Management, Tajen University, Pingtung 907, Taiwan
- 5Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung 202, Taiwan
Abstract. This paper presents modelling the wave conditions in Typhoon Krosa prior to touching Taiwan in October 2007, with third-generation wave models of SWAN and WWM. The accuracy of the extreme wave measurement Hmax = 32 m with significant wave height Hs ≈ 24 m at the depth of h = 38 m is discussed first. It is concluded that the measurement does not appear faulty and is physically realistic. The numerical results are then analysed in order to examine the models' capability to reproduce the observed conditions. It is found that neither SWAN nor WWMII are able to hindcast the extreme measurement. Series of sensitivity tests are conducted for different numerical and diffraction schemes, and source functions. It is shown that, in the circumstances, the model performance only improves in response to the bottom-limited breaking formulation.