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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2021
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ftdoajarticles:oai:doaj.org/article:9aeaa80fd28141b3acee0d55ab86e29b 2023-05-15T15:09:38+02:00 Average Intensity of Low-Frequency Sound and Its Fluctuations in a Shallow Sea with a Range-Dependent Random Impedance of the Liquid Bottom Fengqin Zhu Oleg E. Gulin Igor O. Yaroshchuk 2021-12-01T00:00:00Z https://doi.org/10.3390/app112311575 https://doaj.org/article/9aeaa80fd28141b3acee0d55ab86e29b EN eng MDPI AG https://www.mdpi.com/2076-3417/11/23/11575 https://doaj.org/toc/2076-3417 doi:10.3390/app112311575 2076-3417 https://doaj.org/article/9aeaa80fd28141b3acee0d55ab86e29b Applied Sciences, Vol 11, Iss 11575, p 11575 (2021) random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 article 2021 ftdoajarticles https://doi.org/10.3390/app112311575 2022-12-31T05:44:04Z 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. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Applied Sciences 11 23 11575 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 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 |
topic_facet |
random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 |
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. |
format |
Article in Journal/Newspaper |
author |
Fengqin Zhu Oleg E. Gulin Igor O. Yaroshchuk |
author_facet |
Fengqin Zhu Oleg E. Gulin Igor O. Yaroshchuk |
author_sort |
Fengqin Zhu |
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_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_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_sort |
average intensity of low-frequency sound and its fluctuations in a shallow sea with a range-dependent random impedance of the liquid bottom |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/app112311575 https://doaj.org/article/9aeaa80fd28141b3acee0d55ab86e29b |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Applied Sciences, Vol 11, Iss 11575, p 11575 (2021) |
op_relation |
https://www.mdpi.com/2076-3417/11/23/11575 https://doaj.org/toc/2076-3417 doi:10.3390/app112311575 2076-3417 https://doaj.org/article/9aeaa80fd28141b3acee0d55ab86e29b |
op_doi |
https://doi.org/10.3390/app112311575 |
container_title |
Applied Sciences |
container_volume |
11 |
container_issue |
23 |
container_start_page |
11575 |
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1766340791288987648 |