EFFECTIVENESS OF COMBINED RESONATORS OF DIFFERENT SIZES FOR VERY LONG WAVES

In order to reduce very long waves in a harbor, a combination of two large-sized resonators with different effective ranges of wave frequency is proposed. In order to understand basic properties of the combined resonators, wave transmission characteristic through an infinite array of the combined resonators was first examined theoretically. As an alternative of a rectangular resonator, a detached caisson-type resonator was also adopted to reduce the construction cost. Finally, in order to check the performance of the combined resonators for very long waves, wavesheltering effect by the resonator for a rectangular harbor model was theoretically examined for various wave period conditions, in which the combined resonators were installed at the harbor entrance.