When developing wave power generation, in order to calculate electric power from the existing wave power and wave energy of the Japanese coast, it is important to grasp the characteristic of a wave. This research has grasped the amount of annual wave energy of the Japanese coast based on the annual data of the Nationwide Ocean Wave Information Network for Ports and Harbors (NOWPHAS). Moreover, frequency distribution of the average wave quantity for 20 minutes of NOWPHAS and an average periods is created, comparison with distribution of the past, such as Rayleigh distribution, is performed, and the concept of still newer frequency distribution is proposed.
