Diffraction Of Wave Spectra By Two Breakwaters AtAn Angle

Abstract

The present study tackles the problem of random wave diffraction through an opening between two breakwaters forming an arbitrary angle. The numerical scheme used is result-oriented and employs the solution regarding the diffraction coefficient k for the monochromatic case. The study comprises two parts, the first dealing with uni-directional and the second with multi-directional incoming spectra. A simple energy conservation principle applied to a number of components associated with the monochromatic solution of the diffraction problem, produced one-dimensional spectra of the diffracted waves at any point in the lee of the breakwaters. A compound diffraction coefficient K could thus be established in terms of the k's and the characteristics of the incoming spectrum. Graphs of equal K-values are presented for the various cases examined. The second part of the study deals with waves presenting spatial distribution of energy. A directional spreading function of the Mitsuyasu-type was assumed. The diffracted spectra yielded a composite diffraction coefficient by integrating through the directions as well as through the frequencies.