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Acoustical Physics
Published in: Acoustical Physics 4/2023

01-08-2023 | OCEAN ACOUSTICS. HYDROACOUSTICS

Mode Coupling Due to an Underwater Ice Keel in a Broad Frequency Band

Authors: V. A. Grigorev, A. A. Lunkov

Published in: Acoustical Physics | Issue 4/2023

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Abstract

Numerical simulation is used to study the possibility of remote acoustic monitoring of underwater keels in ice-covered shallow-water waveguides. A statistically average hummock for the Arctic region is considered, with a keel draft of 8 m, located in a waveguide with a depth of 40 m. It is assumed that the ridge of the hummock is perpendicular to the acoustic track, the length of which is 10 km. A point broadband source and a vertical receiving array are used, which are necessary for extracting the mode amplitudes. It is shown that mode coupling due to the keel manifests itself quite distinctly in modulation of the mode amplitudes in a broad frequency band. A methodology for analyzing this modulation by constructing cepstrograms (spectrograms from the spectrum) is proposed. The cepstrograms reveal dispersion curves corresponding to pairs of coupled modes. Then, from the location of the dispersion curves on the cepstrogram, it is possible to estimate the location of the keel on the track.
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Footnotes
1
The second, nonprincipal value of the complex square root differs from the principal value by sign.
 
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Metadata
Title
Mode Coupling Due to an Underwater Ice Keel in a Broad Frequency Band
Authors
V. A. Grigorev
A. A. Lunkov
Publication date
01-08-2023
Publisher
Pleiades Publishing
Published in
Acoustical Physics / Issue 4/2023
Print ISSN: 1063-7710
Electronic ISSN: 1562-6865
DOI
https://doi.org/10.1134/S1063771023600158

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