Three JONSWAP spectra with differen

Three JONSWAP spectra with different peak enhancement factors and the PM spectrum with the same peak frequency are shown in Fig. 1a with the condition that wind speed is 10m/s at the height of 10m and wind fetch is 30 km. As depicted by Fig. 1a, the three peak enhancement factors are 6, 4, and 1.5, and the calculated peak values E are 4.19, 1.75, and 0.39, respectively, indicating the different developing state in the same wind condition.The peak value of the corresponding PM spectrum is 0.11.It is observed that the energy of the peak frequency of these JONSWAP spectra are greater than that of the PM spectrum even when the peak enhancement factor is the minimum value of 1.5, demonstrating the existence of the overshoot phenomenon in the wind-generated wave. In Fig. 1b, two JONSWAP spectra are plotted in different wind speed conditions with the same peak enhancement factor γ=3.3, and the line with the plus sign in different colors are PM spectra corresponding to each JONSWAP spectrum. The figure indicates that the peak frequency of a wind sea and the relevant fully developed state is connected with wind information.