Apparent energy distribution of sea waves

摘要

A concept of apparent energy distribution of sea waves is suggested and named "the outer frequency spectrum" to distinguish it from the frequency spectrum in common sense In line with the concept, a kind of outer spectrum with three parameters in Cauchy’ s form is derived theoretically from the joint distribution of wave periods and heights reached previously by the present authors and the Bretschneider spectrum is rededuced simply in a distinct manner. The foundation of mechanics of the similarity between the frequency spectrum in common sense and the outer one is briefly discussed. In view of the fact that Bretschneider spectrum has a wide application in engineering, the advantages and probability of using the outer spectrum as a common one are also considered.