緣於我國先導型離岸風場場址與中華白海豚之棲地重疊，礙於基樁建
置所產生之噪音對環境生態所產生之影響，因此本研究的主要目的為針對
基樁建置時，所產生的寬頻噪聲進行減噪工法研擬。本研究提出以多層環
型氣泡幕包覆基樁進行減噪，並以實驗方法驗證寬頻聲波通過多層環型氣
泡幕衰減之特性。本研究於實驗水槽中置入水下麥克風及夯錘機構，以撞
擊實驗基樁模擬基樁施工之寬頻噪聲，再藉由多層環型氣泡幕包覆基樁以
分析寬頻聲波通過氣泡幕之消音現象。以能量觀點而言，聲波在通過氣泡
幕時部分能量會被靜態氣泡(silence bubble)自身吸收轉為動態氣泡(active
bubble)，而部分聲波能量因入射、散射及反射波彼此相位差交互作用而導
致穿透之能量衰減。當聲波頻率與氣泡振動頻率相同時則會產生振盪效應
(resonance effect)加強此現象。本研究利用不同氣泡生成方式以產生不同粒
徑之氣泡分佈，運用氣泡粒徑分佈較為廣泛而達到寬頻減噪的效果。研究
成果亦顯示多層環型氣泡幕，因多重散射及反射之故其消音效果約達20
dB 以上之衰減，相較於單層氣泡幕明顯提升。

This study in vestigates effects of the multilayer circular bubble curtains for
attenuating the underwater sound noises produced by driving the piles for
offshore wind farms. The air bubble curtains were generated by passing
compressed air through various circular tubes, such as a porous air tube, a steel
tube with orifices, and a ceramic air stone. Characteristics of bubble curtains
are discussed in terms of the bubble size, the gas void fraction, and the
thickness of curtains. The optimal bubble curtain for diminishing the
underwater noise is concluded in this investigation. The experiment results
reveal that if the multilayer circular bubble curtains are set up around the pile
of the offshore wind turbine, the underwater sound noises with frequency
ranging from 125 Hz to 15 kHz were reduced by about 20 db.

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