Dominic Lagrois , Irene T. Roca , Marc Mingelbier , Jean-François Sénécal , Clément Chion
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引用次数: 0
摘要
声波传播测量是在圣皮埃尔湖的浅水淡水中进行的，圣皮埃尔湖是圣劳伦斯河在montracei和trois - riviires之间的一段加宽河道。两(2)个校准声学投影仪用于覆盖2-60之间的中高频范围。选择跨湖的站点，跨越广泛的水下水生植被（SAV）密度梯度，通过有效覆盖率半定量估算，以评估其对声衰减的影响。植被引起的繁殖损失范围从植被稀疏地区的近0 re 1到臭氧过饱和水柱中SAV占主导地位的约60 re 1。衰减最强的时段是15-17，与亚毫米光合气泡的共振散射一致。然而，在更宽的频带上可测量的衰减表明气泡尺寸分布更广，以及其他与植被相关的机制。这项研究强调了SAV在衰减中高频声能方面的潜在作用，这可能有助于在拥有多种水生物种的淡水生态系统中减轻噪音。
Assessment of sound attenuation by submerged aquatic vegetation in shallow freshwaters
Acoustic propagation measurements were conducted in the shallow freshwater of Lake St. Pierre, a widening of the St. Lawrence River between Montréal and Trois-Rivières. Two (2) calibrated acoustic projectors were used to cover a mid-to-high frequency range between 2-60 . Sites across the lake were selected to span a broad gradient of submerged aquatic vegetation (SAV) density, estimated semi-quantitatively through effective percent cover, to evaluate its impact on sound attenuation. Vegetation-induced excess propagation loss over 10 ranged from near 0 re 1 at sparsely vegetated sites to approximately 60 re 1 where SAV dominated the O2-supersaturated water column. The strongest attenuation occurred between 15-17 , consistent with the resonance scattering of sub-millimetric photosynthetic air bubbles. However, measurable attenuation across a wider frequency band suggests a broader distribution of bubble sizes and additional vegetation-related mechanisms. This study highlights the potential role of SAV in attenuating mid- to high-frequency acoustic energy, which may contribute to noise mitigation in freshwater ecosystems hosting a wide diversity of aquatic species.
期刊介绍：
Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense.
Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems.
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