MATHEMATICAL MODEL FOR WAVE DIFFRACTION BY A DETACHED BREAKWATER

<正> - Detached breakwater is one of the common types of breakwater in coastal engineering. Since the CHINA NATIONAL TECHNICAL STANDARDS FOR PORT ENGINEERING published in 1978 does not provide any method in calculating wave diffraction due to the presence of a detached breadwater, study of the wave diffraction problem is of both theoretical and practical significance. In the present study, by using the singularity distribution method and proper boundary conditions, a mathematical model has been established for two-dimensional wave diffraction around a detached breadwater, and the corresponding computer codes have been developed for ALGOL and FORTRAN language. In the model the wave is assumed to be linear simple harmonic and the entire water depth is constant. Miscellaneous verifications have been carried out with respect to the presented model, among those are the analytical solution for wave diffraction around a cylinder, the wave diffraction result around a detached breakwater obtained by Stassnie et al. by employing the Matheiu function, and the analytical solution, the approximate result and the data from physical model all given by Goda. Through comparisons the results have been proved satisfactory. The present model has now been found its practical application in calculating the wave diffraction of the detached breakwater in Lianyun Port.