Calibration and evaluation of the 3rd generation wave models under extreme conditions in black sea basin

Kirezci, Çağıl
In this study, performances of 3rd generation wave models, SWAN and WAVEWATCH III, under storm conditions in Black Sea are compared considering two different wind source (CFSR and ECMWF operational) data. Basic wave parameters (outputs of the spectral wave models) demonstrate that the governing physical processes in deep water consist of three terms; wind-wave interaction, dissipation of energy due to whitecapping and swell, and nonlinear wave-wave interactions. Effects of different methodologies for the solutions of these physical processes over the frequency and directional space are discussed. Best representation of extreme events in Black Sea was obtained by using WAVEWATCH III model coupled with CFSR wind data. All parametric and solution methodology variations modelled with different wind source data generated results in good agreement with the observations from buoy data in Sinop, Hopa and Gelendzhik. Although, wind wave interaction and dissipation terms defined in Ardhuin et al., 2010 also performed significantly better than the other available methods with its higher correlation to buoy data. Finally, most appropriate boundary conditions and parametrizations for Black Sea basin is introduced for both SWAN and WAVEWATCH III, as a result of calibration and sensitivity analysis study using the observations.