The values for the mean frequency power and mean wave number power must be specified as well. The two parameters are used in the definition of the mean angular frequency and the mean wave number (See General description).
The type of spectrum can be specified in two ways:
· Whole spectrum
· Wind sea part
The formulation of the source term due to whitecapping is as standard applied over the entire spectrum and the integral wave parameters used in the formulation is calculated based on the whole energy spectrum. For wave conditions with a combination of wind-sea and swell this may results in too strong decay of energy on the swell components. Hence, when "Separation of Wind-sea and Swell" is specified on the Spectral discretization page, the predictions for these cases can be improved by only including the dissipation on the wind sea part of the spectrum and by calculating the wave parameters, used in the formulation of whitecapping, from the wind-sea part of the spectrum.