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Frequency shifts of the sound field interference pattern in shallow water because of second-mode soliton-like internal waves

  • Ocean Acoustics. Hydroacoustics
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Abstract

Numerical simulation is carried out to analyze the effect of an internal soliton of the second gravity mode on low-frequency sound propagation in an oceanic shelf region. The simulation is performed using the data of a full-scale experiment performed on the shelf of the South China Sea near Dongsha atoll, where the aforementioned solitons had been detected by stationary vertical thermistor arrays. The calculations take into account the effect of horizontal refraction of sound waves. It is assumed that a stationary acoustic track is oriented across the predominant propagation direction of internal waves. The results of simulation show that, when the soliton crosses the stationary track, some of the sound field modes are focused, whereas other modes are defocused. It is demonstrated that the soliton parameters can be adequately determined from the frequency shifts of the sound field interference pattern. However, such an estimate of the soliton parameters is only possible for a limited length of the stationary track for which the effect of horizontal refraction is sufficiently weak.

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Authors and Affiliations

  1. Wave Research Center, Prokhorov Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia

    A. A. Lunkov & V. G. Petnikov

  2. National Cheng Kung University, 5th F., 500, Sec. 3, Anming Rd., Tainan, 709, Taiwan

    Hwung-Hweng Hwung & Ray-Yeng Yang

  3. National Sun Yat-Sen University, No. 70, Lien-hai Rd., Gushan, Kaohsiung, Taiwan, 804, R.O.C.

    Yu-Huai Wang

Authors
  1. A. A. Lunkov
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  2. V. G. Petnikov
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  3. Hwung-Hweng Hwung
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  4. Yu-Huai Wang
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  5. Ray-Yeng Yang
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Correspondence to A. A. Lunkov.

Additional information

Original Russian Text © A.A. Lunkov, V.G. Petnikov, Hwung-Hweng Hwung, Yu-Huai Wang, Ray-Yeng Yang, 2013, published in Akusticheskii Zhurnal, 2013, Vol. 59, No. 1, pp. 77–85.

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Lunkov, A.A., Petnikov, V.G., Hwung, HH. et al. Frequency shifts of the sound field interference pattern in shallow water because of second-mode soliton-like internal waves. Acoust. Phys. 59, 68–75 (2013). https://doi.org/10.1134/S1063771012060097

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  • DOI: https://doi.org/10.1134/S1063771012060097

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