where Hs is the significant wave height and fp is the frequency at the spectral peak (1/Tp). Parameters and are used to adjust the height and width of the peak of the curve, respectively. In this study, the shaping parameters of a = 0.07, b = 0.09 and = 3.3 were applied. To decompose the spectrum into a time series, 100 waves with frequencies ranging from 0.05 to 1.05 Hz were taken with a resolution of 0.01 Hz (f) and uniformly distributed random phases. The spectrum is shown in Fig. 8.