Forschungs- und Technologiezentrum Westküste, Christian-Albrechts-Universität zu Kiel, 25761 Büsum, Germany.
J Acoust Soc Am. 2011 Nov;130(5):3406-12. doi: 10.1121/1.3626123.
In December 2005 construction work was started to replace a harbor wall in Kerteminde harbor, Denmark. A total of 175 wooden piles were piled into the ground at the waters edge over a period of 3 months. During the same period three harbor porpoises were housed in a marine mammal facility on the opposite side of the harbor. All animals showed strong avoidance reactions after the start of the piling activities. As a measure to reduce the sound exposure for the animals an air bubble curtain was constructed and operated in a direct path between the piling site and the opening of the animals' semi-natural pool. The sound attenuation effect achieved with this system was determined by quantitative comparison of pile driving impulses simultaneously measured in front of and behind the active air bubble curtain. Mean levels of sound attenuation over a sequence of 95 consecutive pile strikes were 14 dB (standard deviation (s.d.) 3.4 dB) for peak to peak values and 13 dB (s.d. 2.5 dB) for SEL values. As soon as the air bubble curtain was installed and operated, no further avoidance reactions of the animals to the piling activities were apparent.
2005 年 12 月，丹麦科特明讷港开始进行海堤更换工程。在 3 个月的时间里，共有 175 根木桩被打入水边的地下。在此期间，三头港湾鼠海豚被安置在港口对面的海洋哺乳动物设施中。所有动物在打桩活动开始后都表现出强烈的回避反应。为了减少动物的声暴露，在打桩地点和动物半自然水池的开口之间建造并运行了一个气泡幕。通过在主动气泡幕前后同时测量打桩脉冲的定量比较，确定了该系统实现的声衰减效果。在 95 次连续打桩过程中的一个序列中，声衰减的平均值为 14 dB（标准偏差（s.d.）为 3.4 dB），峰值到峰值值，SEL 值为 13 dB（s.d. 2.5 dB）。气泡幕一安装并运行，动物对打桩活动就不再表现出回避反应。
