振動水柱を格納した波浪エネルギー吸収型消波構造物に関する研究  [in Japanese] RESEARCH ON THE WAVE ENERGY ABSORPTION FACILITY WITH OSCILLATING WATER COLOUMN  [in Japanese]

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Abstract

波浪エネルギー吸収装置には様々な方式が存在し,代表的なものとしては,振動水柱の運動を空気エネルギーに変換する方法,浮体運動を油圧エネルギーに変換する方法などが挙げられる.振動水柱型波浪エネルギー吸収装置は,波浪エネルギー吸収装置の中で吸収効率が高いものの一つであり,理論的な解明に関しては研究が進んでいる.これまで筆者らは,振動水柱の持つ固有周期の存在を明確にし,波浪エネルギー吸収効率を検証して,それらを装着した養殖生簀の動揺抑制に活用しているが,振動水柱を護岸施設や消波施設等へ適用するまでには至っていない.<br> 本研究では,機械装置等を使用することなく,振動水柱の運動を空気エネルギーに変換する方法を採用し,防波堤,消波ブロック内に格納する方式を採用した波浪エネルギー吸収型消波構造物の開発と実用化を目的とした.

 Many wave energy absorption system proposed can absorb wave energy with high efficiency, regarding wave energy at a specified frequency band. But they have lower their absorption efficiency in irregular waves. This is due to the fact that while waves themselves are composed of wide-range frequencies. The natural frequency of the wave energy absorption system itself is basically a single one, and is so arranged that the wave absorption efficiency will become the greatest in the vicinity of its natural frequency. To overcome this discrepancy, ingenuity has been used to estimate the incident waves and functionally change the natural frequency, but this method has not yet been able to enhance the efficiency. This research verifies the existense of determining the natural frequency of the water column in the oscillating water-column-type wave energy absorption facility, using the same concept as that of the water column in the U-shaped tube. We comfirmed the absorption efficiency at the case of installing plural number of water columns which have different natural frequencies in the same facility. In addition, this facility was able to absorb the wave energy of an irregular waves in real marine area.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 70(2), I_277-I_282, 2014

    Japan Society of Civil Engineers

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