Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom
In this study, the problem of the influence of a horizontally inhomogeneous liquid bottom impedance, given by random Gaussian function of the speed of sound and by density, on the propagation of low-frequency sound in a shallow-water waveguide is considered. The model parameters are referenced to th...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/23/11575 |
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| author | Fengqin Zhu Oleg E. Gulin Igor O. Yaroshchuk |
| author_facet | Fengqin Zhu Oleg E. Gulin Igor O. Yaroshchuk |
| author_sort | Fengqin Zhu |
| collection | DOAJ |
| description | In this study, the problem of the influence of a horizontally inhomogeneous liquid bottom impedance, given by random Gaussian function of the speed of sound and by density, on the propagation of low-frequency sound in a shallow-water waveguide is considered. The model parameters are referenced to the conditions of sound propagation in the regions of the seas of the Russian Arctic shelf. By the example of statistical modeling of the sound field intensity, we show that sound speed fluctuations in the bottom lead to similar effects that were previously established for volumetric fluctuations of the speed of sound in the water layer. With the distance from the source, the decrease in the average intensity slows down in comparison with a deterministic medium in which there are no fluctuations. This deceleration of the decay of the intensity in a random waveguide can be significant already at short distances. Changes in the law of decay of intensity at a fixed frequency are mainly determined by the correlation radius of inhomogeneities and the average penetrability of the bottom, which leads to attenuation of sound propagating in the waveguide. |
| first_indexed | 2024-03-10T04:56:24Z |
| format | Article |
| id | doaj.art-9aeaa80fd28141b3acee0d55ab86e29b |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T04:56:24Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9aeaa80fd28141b3acee0d55ab86e29b2023-11-23T02:10:33ZengMDPI AGApplied Sciences2076-34172021-12-0111231157510.3390/app112311575Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid BottomFengqin Zhu0Oleg E. Gulin1Igor O. Yaroshchuk2College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, ChinaV.I. Il’ichev Pacific Oceanological Institute, Far-East Branch of Russian Academy of Sciences, 690068 Vladivostok, RussiaV.I. Il’ichev Pacific Oceanological Institute, Far-East Branch of Russian Academy of Sciences, 690068 Vladivostok, RussiaIn this study, the problem of the influence of a horizontally inhomogeneous liquid bottom impedance, given by random Gaussian function of the speed of sound and by density, on the propagation of low-frequency sound in a shallow-water waveguide is considered. The model parameters are referenced to the conditions of sound propagation in the regions of the seas of the Russian Arctic shelf. By the example of statistical modeling of the sound field intensity, we show that sound speed fluctuations in the bottom lead to similar effects that were previously established for volumetric fluctuations of the speed of sound in the water layer. With the distance from the source, the decrease in the average intensity slows down in comparison with a deterministic medium in which there are no fluctuations. This deceleration of the decay of the intensity in a random waveguide can be significant already at short distances. Changes in the law of decay of intensity at a fixed frequency are mainly determined by the correlation radius of inhomogeneities and the average penetrability of the bottom, which leads to attenuation of sound propagating in the waveguide.https://www.mdpi.com/2076-3417/11/23/11575random mediacomputational shallow-water acousticsrange-dependent waveguideslocal modesinhomogeneous impedance of the bottomstatistical modeling and computing |
| spellingShingle | Fengqin Zhu Oleg E. Gulin Igor O. Yaroshchuk Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom Applied Sciences random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing |
| title | Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom |
| title_full | Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom |
| title_fullStr | Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom |
| title_full_unstemmed | Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom |
| title_short | Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom |
| title_sort | average intensity of low frequency sound and its fluctuations in a shallow sea with a range dependent random impedance of the liquid bottom |
| topic | random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing |
| url | https://www.mdpi.com/2076-3417/11/23/11575 |
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