VARIDATION OF GODA’S DIAGRAM OF THE OVERTOPPING RATE USING NUMERICSL CALCULATIONS WITH CADMAS-SURF

Abstract

 Since its proposal, Goda's diagram of the overtopping rate has been used in seawall designs in Japan and abroad. In this study, numerical calculations using CADMAS-SURF are carried out to calculate the shoaling deformation and wave breaking deformation of regular waves and the overtopping rate, and the mean overtopping rate of irregular waves is obtained by applying the Rayleigh distribution to the wave height distribution of individual waves consisting of an irregular wave-group. The results of the numerical calculations are compared with the Goda’s diagram, and it is shown that for upright seawalls and dissipating seawalls, the two are in some agreement when the seabed slope is 1/10, but there is a significant difference between the two at 1/30.