Acoustic attenuation in very shallow water due to the presence of bubbles in rip currents
Acoustic attenuation in very shallow water due to the presence of bubbles in rip currents
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DOI：
10.1121/1.427030
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发表时间：
1999-08-01
影响因子：
2.4
通讯作者：
Goodman, RR
中科院分区：
文献类型：
--
作者：
Caruthers, JW;Stanic, SJ;Goodman, RR
在斯克里普斯海洋研究所的研究码头附近进行了一项实验，以确定小气泡在非常浅的水中（类似于6米深）的声学效果。离岸距离大约为300米。传播长度为2-10 m，频率范围为39 - 244 kHz。在实验过程中，撕裂电流通过测量仪器的领域。这些离岸流充满了仪器和海岸之间的海浪中产生的气泡。这些RIP电流的空间分布上产生的声衰减的影响进行了讨论。根据衰减数据，使用新的迭代方法计算气泡分布[卡鲁瑟斯等人，出版中，J. Acoust Sec. Am.]这是基于众所周知的共振气泡近似。计算，气泡分布变化从基本上均匀的气泡在静止期间的高度不均匀和密集的气泡区域内的RIP事件。这种观察到的分布与实验期间其他研究人员的测量结果一致。(C)1999年美国声学学会。[S0001-4966（99）05307-2]。
An experiment was performed just off the research pier at the Scripps institute of Oceanography to determine the acoustic effects of small bubbles in very shallow water (similar to 6 m depth). The distance offshore was similar to 300 m. The propagation lengths were 2-10 m, and the frequency range was from 39 to 244 kHz. During the experiment, rip currents passed through the field of measurement instruments. These rip currents were laden with bubbles created in the surf between the instruments and the shore. The effects of these rip currents on the spatial distributions of the resulting acoustic attenuation are discussed. From the attenuation data, the bubble: distributions are calculated using a new iterative approach [Caruthers ct al., in press, J. Acoust Sec. Am.] that is based on the well-known resonant bubble approximation. Calculated,bubble distributions varied from an essentially uniform lack of bubbles during quiescent periods to highly inhomogeneous and dense bubbly regions within rip events. Such observed distributions were consistent with measurements made by other investigators during the experiment. (C) 1999 Acoustical Society of America. [S0001-4966(99)05307-2].