A Multifrequency Acoustic Sounding System for Studying the Acoustic Characteristics of the Upper Layer of the Sea

Bulanov, V. A.; Korskov, I. V.; Sosedko, S.N.; Storozhenko, A. V.

doi:10.1134/s0020441220030161

“…The coastal equipment allowed for multi-frequency measurement of scattering signals by various methods. The method of simultaneous emission of pulses of different frequencies was used, followed by filtering of the received signals through channels [21] (Figure 1). The programmable generator GSPF-053 from the company "Rudnev and Shilyaev" (Moscow) was used as a digital signal generator.…”

Section: Experimental Methods and Equipmentmentioning

confidence: 99%

On Sound Scattering and Acoustic Properties of the Upper Layer of the Sea with Bubble Clouds

Bulanov

¹

,

Bugaeva

²

,

Storozhenko

³

2022

JMSE

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The presence of bubbles near the sea surface under certain conditions leads to abnormal sound scattering and a significant change in the acoustic properties of the upper layer of the sea. The article presents some results of sound scattering studies under various sea conditions, up to stormy conditions, when extensive bubble clouds arise. By the method of unsteady acoustic spectroscopy, data on the size distribution of bubbles at various depths have been obtained, which can be described by a power function with exponential decay at small bubble sizes of the order of 10 microns. Estimates of the gas content in bubble clouds and their influence on the acoustic characteristics of the upper layer of the sea have been carried out. It is shown that at sufficiently high concentrations, sharp increases in absorption and dispersion of the sound velocity are observed. Modeling of sound propagation in the presence of a quasi-homogeneous bubble layer shows that it leads both to a change in the laws of the average decay of the sound field along the sound propagation path and to a change in the shallow spatial structure of the field.

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“…The coastal equipment allowed for multi-frequency measurement of scattering signals by various methods. The method of simultaneous emission of pulses of different frequencies was used, followed by filtering of the received signals through channels [21] (Fig. 1).…”

Section: Experimental Methods and Equipmentmentioning

confidence: 99%

On Sound Scattering and Acoustic Properties of the Upper Layer of the Sea With Bubble Clouds

Bulanov¹,

Bugaeva²,

Storozhenko³

2022

Preprint

1

0

View full text Add to dashboard Cite

The presence of bubbles near the sea surface under certain conditions leads to abnormal sound scattering and a significant change in the acoustic properties of the upper layer of the sea. The article presents some results of sound scattering studies under various sea conditions, up to stormy conditions, when extensive bubble clouds arise. By the method of unsteady acoustic spectroscopy, data on the size distribution of bubbles at various depths have been obtained, which can be described by a power function with exponential decay at small bubble sizes of the order of 10 microns. Estimates of the gas content in bubble clouds and their influence on the acoustic characteristics of the upper layer of the sea have been carried out. It is shown that at sufficiently high concentrations, sharp increases in absorption and dispersion of the sound velocity are observed. Modeling of sound propagation in the presence of a quasi-homogeneous bubble layer shows that it leads both to a change in the laws of the average decay of the sound field along the sound propagation path and to a change in the shallow spatial structure of the field.

show abstract

Measurement of Scattering Properties of Water Body by Using a Multibeam Echosounder System

Cao

¹

,

Fang

²

,

Gu

³

et al. 2023

IEEE Trans. Instrum. Meas.

1

0

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A Multifrequency Acoustic Sounding System for Studying the Acoustic Characteristics of the Upper Layer of the Sea

Cited by 3 publications

References 10 publications

On Sound Scattering and Acoustic Properties of the Upper Layer of the Sea with Bubble Clouds

On Sound Scattering and Acoustic Properties of the Upper Layer of the Sea with Bubble Clouds

On Sound Scattering and Acoustic Properties of the Upper Layer of the Sea With Bubble Clouds

Measurement of Scattering Properties of Water Body by Using a Multibeam Echosounder System

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