| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Analysis of Long-Range Transmission Loss in the West Pacific Ocean |
| WU Li-Li1,2**, PENG Zhao-Hui1 |
1State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190
2University of Chinese Academy of Sciences, Beijing 100190
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| Cite this article: |
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WU Li-Li, PENG Zhao-Hui 2015 Chin. Phys. Lett. 32 094302 |
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Abstract A long-range sound propagation experiment was conducted in the West Pacific Ocean in July 2013. Linear frequency-modulated signals with a frequency band of 260–360 Hz were transmitted by a transducer hung on a floating ship during the experiment and were received by a horizontal line array towed by another ship sailing away from the transducer. The maximum distance between the two ships was 1029 km. Signals were received at the distances 34–220 km, 612–635 km and 926–1029 km. Transmission loss versus distance between source and receiver was obtained and compared with the theoretical results predicted by the parabolic equation method program RAM. It is shown that RAM is adequate for estimating the transmission loss for distances up to 1029 km. When the water depth is larger than the surface conjugate depth, the ocean bottom rarely influences the transmission loss in the convergence zones. However, in the opposite situation, the ocean bottom contributes significantly to the transmission loss.
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Received: 05 March 2015
Published: 02 October 2015
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| PACS: |
43.30.Es
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(Velocity, attenuation, refraction, and diffraction in water, Doppler effect)
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43.30.Re
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(Signal coherence or fluctuation due to sound propagation/scattering in the ocean)
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43.30.Cq
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(Ray propagation of sound in water)
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