Complex Application of Ray and Wave Approaches to Sound Field Calculations in a Narrow Waveguide on the Black Sea Shelf

V. A. Lisyutin*, O. R. Lastovenko, A. A. Yaroshenko

Sevastopol State University, Sevastopol, Russia

* e-mail: vlisiutin@mail.ru

Abstract

This article deals with study of combined use of ray and wave methods for assessment of underwater sound field intensity in shallow water given different types of sediments and different sound localizations. A hydroacoustic waveguide is considered with a sound velocity profile containing a narrow near-bottom and weakly pronounced near-surface sound channels. Two types of seabed are considered: silty and sandy, and two cases of source location: near-surface and near-bottom. Two approaches are used to calculate the acoustic field: the ray method and normal wave method. It is accepted that the ray method is more consistent with the high frequency range, whereas the normal wave method is more consistent with the low frequency range. It is shown that as the frequency increases, the vertical profile of normal waves concentrates in the region of global minimum on the sound velocity profile. The dispersion characteristics of normal modes and their attenuation coefficients are analyzed. It is shown that the smallest group velocity of a normal mode corresponds to the largest attenuation coefficient, which is explained by a significant interaction with the bottom. The calculated sound field levels in the water layer are used to estimate the field level of a sound source that is traumatic for benthic fauna. It is shown that in case of a sound velocity profile with two sound channels and source location on the axis of a narrow waveguide, the ray method for calculation of the pattern of sound strength decay with distance gives a systematic underestimation of the field level.

Keywords

sound velocity profile, normal wave method, ray method, marine sediments, phase velocity, marine invertebrates.

Acknowledgments

The research is performed under scientific project no. 18-42-920001 and funded by the Russian Foundation for Basic Research and city of Sevastopol.

For citation

Lisyutin, V.A., Lastovenko, O.R. and Yaroshenko, A.A., 2020. Complex Application of Ray and Wave Approaches to Sound Field Calculations in a Narrow Waveguide on the Black Sea Shelf. Ecological Safety of Coastal and Shelf Zones of Sea, (1), pp. 92–103. doi:10.22449/2413-5577-2020-1-92-103 (in Russian).

DOI

10.22449/2413-5577-2020-1-92-103

References

  1. Popper, A.N. and Hawkins, A.D., 2018. The Importance of Particle Motion to Fishes and Invertebrates. The Journal of the Acoustical Society of America, 143(1), pp. 470–488. https://doi.org/10.1121/1.5021594
  2. Brekhovskikh, L.M. and Lysanov, Yu.P., 2003. Fundamentals of Ocean Acoustics. New York: Springer, 279 p. doi:10.1007/b97388
  3. Divizinyuk, М.М., 1999. Changes in Acoustical Characteristics of the Shelf Regions of the Black Sea Caused by Constant Streams. Acoustic Bulletin, 2(3), pp. 42–48 (in Russian).
  4. Lisiutin, V.A., Lastovenko, O.R. and Yaroshenko, A.A., 2018. The Comparative Evaluation of the Ray and Wave Components Contribution to the Impulse Signals Propagation of the Black Sea Underwater Sound Channel. Ecological Bulletin of Research Centers of the Black Sea Economic Cooperation, 15(2), pp. 74–85. https://doi.org/10.31429/vestnik-15-2-74-85 (in Russian).
  5. Rutenko, A.N., Gritsenko, V.A., Kovzel, D.G., Manulchev, D.S. and Fershalov, M.Yu., 2019. A Method for Estimating the Characteristics of Acoustic Pulses Recorded on the Sakhalin Shelf for Multivariate Analysis of their Effect on the Behavior of Gray Whales. Acoustical Physics, 65(5), pp. 556–566. https://doi.org/10.1134/S10637710 1904016X
  6. Dahl, P.H. and DallʼOsto, D.R., 2017. On the Underwater Sound Field from Impact Pile Driving: Arrival Structure, Precursor Arrivals, and Energy Streamlines. The Journal of the Acoustical Society of America, 142(2), pp. 1141–1155. https://doi.org/10.1121/1.4999060
  7. Lippert, T., Ainslie, M.A. and von Estorff, O., 2018. Pile Driving Acoustics Made Simple: Damped Cylindrical Spreading Model. The Journal of the Acoustical Society of America, 143(1), pp. 310–317. https://doi.org/10.1121/1.5011158
  8. Lisyutin, V.A., 2019. Generalized Rheological Model of the Unconsolidated Marine Sediments with Internal Friction and Effective Compressibility. Physical Oceanography, 35(1), pp. 77–91. doi:10.22449/1573-160X-2019-1-77-91
  9. Jensen, F.B., Kuperman, W.A., Porter, M.B. and Schmidt, H., 1994. Computational Ocean Acoustics. New York: AIP Press, 578 p.

Download the article (PDF, in Russian)