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As a result, the peak frequency is 0.24 Hz (where the main peak is located) and thus the peak period is 4.2 s. On the other hand, the mean wave frequency calculated by averaging the whole nondimensional spectrum is 0.29 Hz and thus the mean wave period is 3.5 s. Let's have a look now at the evolution of the sea conditions during the same day. 3. Mean Square Slope [8] Using the wave number spectrum presented in the last section, the mean square slope, s 2, of the ocean surface can be calculated. Because waves longer that the wavelength at the spectral peak make only negligible contribution to the total mean square slope, the lower-bound wave number for integration is set at k p. The.