Statistical Patterns of Transmission Losses of Low-Frequency Sound in Shallow Sea Waveguides with Gaussian and Non-Gaussian Fluctuations
Source abstract
Abstract
Based on the local mode method, the problem of the average intensity (transmission loss) behavior in shallow waveguides with losses in the bottom and fluctuations of the speed of sound in water is considered. It was previously shown that the presence in a waveguide with absorbing penetrable bottom of 2D random inhomogeneities of the speed of sound leads to the appearance of strong fluctuations in the acoustic field already at relatively small distances from the sound source. One of the most important and interesting manifestations of this is the slowing down of the average intensity of the acoustic field compared with a waveguide, which has no such random inhomogeneities of the speed of sound. This paper presents the results of a numerical analysis of the decay of the average field intensity in the presence of both Gaussian and non-Gaussian fluctuations in the speed of sound. It is shown that non-Gaussian fluctuations do not fundamentally change the conclusion about reducing losses during the propagation of a sound signal but can enhance this effect.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Underwater Acoustics Research · Arctic and Antarctic ice dynamics · Methane Hydrates and Related Phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China
College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
V.I. Il’ichev Pacific Oceanological Institute, Far-East Branch of Russian Academy of Sciences, Vladivostok 690068, Russia
Funding
National Natural Science Foundation of China · Russian State Program
References (33)
Show source-provided references
1. Tatarskii, V.I. (1971). Effects of the Turbulent Atmosphere on Wave Propagation, Israel Program for Scientific Translations.
2. Rytov, S.M., Kravtsov, Y.A., and Tatarskii, V.I. (1989). Principles of Radiophysics, Springer. [4th ed.].
3. Sound propagation through fluctuating stratified ocean: Theory and observation10.1121/1.380933 ↗
4. Flatte, S.M. (1979). Sound Transmission through a Fluctuating Ocean, Cambridge University.
5. Brekhovskikh, L.M., and Lysanov, Y.P. (1982). Fundamentals of Ocean. Acoustics, Springer.10.1007/978-3-662-02342-6 ↗
6. Acoustical effects caused by intensive internal waves in a shelf
7. Keller, J.B., and Papadakis, J.S. (1977). Propagation of waves in randomly-inhomogeneous ocean. Waves Propagation and Underwater Acoustics, Springer.10.1007/3-540-08527-0 ↗
8. Statistics of normal-mode amplitudes in a random ocean. I. Theory10.1121/1.381746 ↗
9. Statistics of normal-mode amplitudes in a random ocean. II. Computations10.1121/1.382005 ↗
10. Vector characteristics in statistically inhomogeneous wave-guides
11. Scintillating shallow water waveguides10.1121/1.414817 ↗
12. Acoustic propagation through an internal wave field in a shallow water waveguide10.1121/1.418039 ↗
13. Katsnelson, B.G., Petnikov, V.G., and Lynch, J. (2012). Fundamentals of Shallow Water Acoustics, Springer.10.1007/978-1-4419-9777-7 ↗
14. Simulations of large acoustic scintillations in the Straits of Florida10.1121/1.2372446 ↗
15. Low frequency sound scattering by internal waves in the ocean10.1121/1.2167058 ↗
16. Coherence function of a sound field in an ocean with horizontally isotropic statistics10.1121/1.3035832 ↗
17. Statistics of normal-mode amplitudes in an ocean with random sound-speed perturbations: Cross mode coherence and mean intensity10.1121/1.3158818 ↗
18. Statistics of low-frequency normal-mode amplitudes in an ocean with random sound-speed perturbations: Shallow-water environments10.1121/1.3666002 ↗
19. Influence of random hydrodynamic inhomogeneities on the attenuation of low-frequency sound in a shallow sea10.1134/S1063771010030103 ↗
20. Coherence of low-frequency sound in a shallow sea in the presence of internal waves10.1134/S1063771014010096 ↗
21. Yaroshchuk, I.O., and Gulin, O.E. (2002). Method of Statistical Modeling in the Problems of Hydroacoustics, Dal’nauka. (In Russian).
22. Simulation of underwater acoustical field fluctuations in shallow sea with random inhomogeneities of sound speed: Depth-dependent environment10.1142/S0218396X14400025 ↗
23. Simulation of underwater acoustical field fluctuations in range-dependent random environment of shallow sea10.1142/S0218396X14400062 ↗
24. Notes on the theory of low-frequency acoustic fields in a randomly heterogeneous ocean10.1134/S1028334X14090050 ↗
25. Features of the energy structure of acoustic fields in the ocean with two-dimensional random inhomogeneities10.1134/S1063771017020051 ↗
26. Dependence of the mean intensity of a low-frequency acoustic field on the bottom parameters of a shallow sea with random volumetric water-layer inhomogeneities10.1134/S1063771018020069 ↗
27. Causal first-order equations for wave field modeling in a horizontally inhomogeneous ocean10.1134/S1063771006010039 ↗
28. Calculation of low-frequency sound fields in irregular waveguides with strong backscattering10.1134/S106377100804009X ↗
29. Comments on modeling the sound fields in an irregular ocean by causal first-order equations10.1134/S1063771008030093 ↗
30. Brekhovskikh, L.M., and Godin, O.A. (2009). Sound Fields in Layered and Three-Dimensional Inhomogeneous Media. Acoustics of Inhomogeneous Media, Nauka. [2nd ed.]. (In Russian).
31. On local effect of low-frequency sound field mode coupling in randomly-inhomogeneous two–dimensional shallow sea
32. Simulation of low-frequency sound propagation in shallow sea with two-dimensional random inhomogeneities10.1121/2.0000196 ↗
33. Wolf, E. (1994). The imbedding method in statistical boundary-value wave problems. Progress in Optics, Elsevier.