It is well known that the distribution of the wave heights and wave forces are not uniform in the vicinity of a refletive breakwater which is not straight. Wave forces are amplified by the mutual interrence of incident and reflected waves, when the breakwater has a concave shape (in plane) facing the direction of incident wave.
So far, some model experiments and theoretical analyses with regard to this phenomenon have been perfarmed. Nevertheless, they have not yet provided a design theory of breakwaters of concave plane figure against wave action.
It is supposed that the amplification of wave heights is a principal cause for that of wave forces. From this stand point, a numerical solution of wave height affected by the plane figure of breakwaters is developed in this report, aiming to examine the characteristic of wave height distribution.
Afterward, wave height distributions are calculated under practical conditions; irregular incident waves and finite breakwater lengths, by means of the numerical solution. In addition the amplification factor of wave height for several practical conditions are presented in the basis of the numerical calculation.