Speed dependence, sources, and directivity of small vessel underwater noise.
| Autor: | Johansson AT; IVL Swedish Environmental Research Institute, Aschebergsgatan 44, SE-411 33 Gothenburg, Sweden., Lalander E; Swedish Defence Research Agency, SE-164 90 Stockholm, Sweden., Krång AS; IVL Swedish Environmental Research Institute, Kristineberg Marine Research and Innovation Centre, Kristineberg 566, SE-451 78 Fiskebäckskil, Sweden., Andersson MH; Swedish Defence Research Agency, SE-164 90 Stockholm, Sweden. |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of the Acoustical Society of America [J Acoust Soc Am] 2024 Oct 01; Vol. 156 (4), pp. 2077-2087. |
| DOI: | 10.1121/10.0028385 |
| Abstrakt: | Small vessels (<10 m) radiate underwater noise in sensitive coastal environments, but there is insufficient knowledge of their noise radiation. Through detailed measurements of seven small boats and a jet ski in a shallow water environment on the Swedish west coast, this study presents results on the speed dependence of small vessel underwater noise, its sources, and its directivity. For vessels with planing hulls, broadband source levels increase with speed until planing is attained. When planing, source level dependence on speed is weak. A detailed noise source analysis of one vessel showed that at low speed, tonals from the engine dominate the noise radiation, whereas at higher speeds, propeller tonals and broadband noise dominate. Noise radiation into different horizontal angles shows little angle dependence, and noise levels relative to the closest point of approach show a similar pattern across all investigated vessels. Received noise levels at approximately 100 m range are not high enough to cause hearing impairment in marine animals, but fast-moving small vessels may cause behavioural reactions or stress responses across several marine animal groups. (© 2024 Acoustical Society of America.) |
| Databáze: | MEDLINE |
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