御前崎沖波浪観則における多峯型方向スペクトル波の出現頻度特性

抄録

The results of the spectral analysis for field wave data indicate that a lot of wave spectra show multi-peaked forms. The multi-peaked spectral waves affect the tranquility in a harbor, the construction plan of marine structures and the motion of a moored ship. However, the characteristics of multi-peaked spectral waves have not been well known. The present paper investigates the occurrence characteristics of directional random waves with multi-peaks through the statistical analysis of directional spectra. The directional spectra are computed from field wave data observed off Omaezaki for one year. The appearance probability of multi-peaked spectra occupies more than 30% on yearly average and the correlation analysis shows that the correlation is high between the significant wave heights of short and long wave groups which are components of multi-peaked spectral waves.