Observations of low-frequency, long-range acoustic propagation in the Philippine Sea and comparisons with mode transport theory

被引：0

作者：

Chandrayadula, Tarun K. ^{[1
]}

Periyasamy, Sivaselvi ^{[1
]}

Colosi, John A. ^{[2
]}

Worcester, Peter F. ^{[3
]}

Dzieciuch, Matthew A. ^{[3
]}

Mercer, James A. ^{[4
]}

Andrew, Rex K. ^{[4
]}

机构：

[1] Department of Ocean Engineering, Indian Institute of Technology Madras, Adyar, Chennai,600036, India

[2] Department of Oceanography, Naval Postgraduate School, 1 University Circle, Monterey,CA,93943, United States

[3] Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, San Diego,CA,92093, United States

[4] Applied Physics Laboratory, University of Washington, Seattle,WA,98105, United States

来源：

Journal of the Acoustical Society of America | 2020年 / 147卷 / 02期

关键词：

The year-long Philippine Sea (2010-2011) experiment (PhilSea) was an extensive deep water acoustic propagation experiment in which there were six different sources transmitting to a water column spanning a vertical line array. The six sources were placed in an array with a radius of 330 km and transmitted at frequencies in the 200-300 Hz and 140-205 Hz bands. The PhilSea frequencies are higher than previous deep water experiments in the North Pacific for which modal analyses were performed. Further; the acoustic paths sample a two-dimensional area that is rich in internal tides; waves; and eddies. The PhilSea observations are; thus; a new opportunity to observe acoustic modal variability at higher frequencies than before and in an oceanographically dynamic region. This paper focuses on mode observations around the mid-water depths. The mode observations are used to compute narrowband statistics such as transmission loss and broadband statistics such as peak pulse intensity; travel time wander; time spreads; and scintillation indices. The observations are then compared with a new hybrid broadband transport theory. The model-data comparisons show excellent agreement for modes 1-10 and minor deviations for the rest. The discrepancies in the comparisons are related to the limitations of the hybrid model and oceanographic fluctuations other than internal waves. © 2020 Acoustical Society of America;

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页码：877 / 897