CNR-National Research Council, ISMAR - Institute of Marine Sciences in Venice, Castello 2737/f, 30122 Venice, Italy; Blue World Institute of Marine Research and Conservation, Kaštel 24, 51551 VeliLošinj, Croatia.
University of Parma, Department of Engineering and Architecture, Parco Area delleScienze 181/a, 43124 Parma, Italy.
Mar Pollut Bull. 2022 Oct;183:114050. doi: 10.1016/j.marpolbul.2022.114050. Epub 2022 Aug 25.
Recreational boats are a dominant source of underwater noise in coastal areas, but reliable boat noise assessment is generally lacking. Here the Underwater Radiated Noise (URN) of seven recreational and small fishing boats moving at two different speeds was measured in the shallow waters of the Cres-Lošinj Natura 2000 SCI (Croatia). Measurements were undertaken considering the internationally recognized standards and published guidelines for shallow waters. URN was provided in 1/3 octave band spectra and in narrow band spectra, to highlight the tonal components. Engine power and type rather than the boat length and design result to be more predictive of URN. Highest speeds induce highest noise levels only in a very limited frequency range and different boats with similar speed but different engines show a shift in the spectra. Relevance of the achieved results for the tested area is further discussed.
休闲船是沿海地区水下噪声的主要来源，但可靠的船噪声评估通常缺乏。在这里，在克罗地亚 Cres-Lošinj Natura 2000 SCI 的浅水区测量了以两种不同速度行驶的七艘休闲船和小型渔船的水下辐射噪声（URN）。测量是根据国际公认的标准和浅水发布的指南进行的。URN 以 1/3 倍频带谱和窄带谱的形式提供，以突出音调成分。发动机功率和类型而不是船的长度和设计结果更能预测 URN。只有在非常有限的频率范围内，最高速度才会导致最高噪声水平，而具有相似速度但不同发动机的不同船只在频谱中会发生偏移。进一步讨论了在测试区域获得的结果的相关性。
