A METHOD FOR ESTIMATING STANDARDIZED BIMODAL DIRECTIONAL SPECTRA

Ryuichi Fujiwara, Masahiko Isobe

Abstract


Random sea waves are described by directional spectra which sometimes have bimodal distributions. Frequency spectra are often expressed in standardized forms which contain several parameters. This makes it easy to accumulate and analyze a large number of data obtained in various fields and to specify incident wave conditions in designing practice. In the present study, a method is proposed for estimating directional spectra in the form of a standardized bimodal distribution. The validity of the method is verified by numerical simulation for a three-component array (water surface elevation and horizontal two components of the water particle velocity). Furthermore, several applications to field data are shown.

Keywords


directional spectra; bimodal spectra

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