Abstract
It is presented how to calculate the efficiency of wave power absorption by oscillating water column type wave power devices installed to breakwaters. Experimental results and theoretical calculation results on amplitude of pressure and water lever in air chambers are shown. The theoretical calculation results, in which the compressibility of air is taken account and the pressure surface condition on water surface is strictly satisfied within the range of liner theory, are good agreement with experimental ones in the case when the period of incoming wave is long. In the case of wave length being short, the agreements are improved by taking the energy loss due to vortex shedding under the edge of curtain wall into consideration. The energy absorption characteristics of the chamber partitioned into two regions by a vertical or horizontal plate are shown. Such cambers have two resonant period corresponding with the dimensions of each partitioned region . The wave power device partitioned by a vertical plate is considered to have more applicable characteristics of wave power absorption as compared with the one by a horizontal plate.
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