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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ftmdpi:oai:mdpi.com:/2076-3417/11/23/11575/ 2023-08-20T04:04:39+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 agris 2021-12-06 application/pdf https://doi.org/10.3390/app112311575 EN eng Multidisciplinary Digital Publishing Institute Acoustics and Vibrations https://dx.doi.org/10.3390/app112311575 https://creativecommons.org/licenses/by/4.0/ Applied Sciences; Volume 11; Issue 23; Pages: 11575 random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing Text 2021 ftmdpi https://doi.org/10.3390/app112311575 2023-08-01T03:28:30Z 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. Text Arctic MDPI Open Access Publishing Arctic Applied Sciences 11 23 11575 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing |
spellingShingle |
random media computational shallow-water acoustics range-dependent waveguides local modes inhomogeneous impedance of the bottom statistical modeling and computing 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 |
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 |
Text |
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 |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/app112311575 |
op_coverage |
agris |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Applied Sciences; Volume 11; Issue 23; Pages: 11575 |
op_relation |
Acoustics and Vibrations https://dx.doi.org/10.3390/app112311575 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/app112311575 |
container_title |
Applied Sciences |
container_volume |
11 |
container_issue |
23 |
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11575 |
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