Measuring underwater background noise in high tidal flow environments
Measuring underwater background noise in high tidal flow environments
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DOI：
10.1016/j.renene.2012.01.020
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发表时间：
2013
期刊：
影响因子：
8.7
通讯作者：
M. R. Willis;M. Broudic;Charlotte Haywood;I. Masters;Sara Thomas
中科院分区：
文献类型：
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作者：
M. R. Willis;M. Broudic;Charlotte Haywood;I. Masters;Sara Thomas
了解海洋能源开发对拟议安装区域水下噪声水平的影响是任何环境影响评估的关键部分。本文使用基于船的水听器测量数据，从一个受潮流高达3 m s-1的区域，并确定背景噪声水平如何随潮流和流向变化。结果发现，一个更有意义的表达的背景噪声是通过参考“功率电平”所测量的频谱的均方根。在整个潮汐周期的淡季（相对于其他海上活动）和旺季进行了水听器测量。背景噪声水平范围为72至108 dB re 1 μ PaRMS，声压级在100 Hz以下的频率处较高。背景噪声水平随潮汐流量的增加而增加，落潮时高于涨潮时。
Understanding the effect of marine energy development on the underwater noise levels in a proposed installation area forms a crucial part of any Environmental Impact Assessment. This paper uses boat-based hydrophone survey data taken from an area subject to tidal currents up to 3 m s−1and determines how the background noise levels change with tidal flow and flow direction. It was found that a more meaningful expression of background noise was gained by reference to “Power level” as measured by the Root Mean Square of the spectrum. Hydrophone measurements were taken during low season (with respect to other maritime activity) and in high season over the entire tidal cycle. Background noise levels ranged between 72 and 108 dB re 1 μPaRMSwith higher sound pressure levels occurring at frequencies below 100 Hz. Background noise levels increased with increasing tidal flow and were higher on ebb tides than flood tides.