Estimation of bottom parameters using measurement and analysis of sound intensity fluctuations in the presence of moving nonlinear internal waves in shallow water

Boris Katsnelson, Valery Grigorev, Yanyu Jiang, Yun Ren

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Methodology of estimation of bottom parameters is proposed using data processing and analysis of sound intensity fluctuations due to mode coupling in the presence of moving nonlinear internal waves (NIW) in shallow water channel. As an examples experiments Shallow Water 2006 (Atlantic shelf of USA) [1] and ASIAEX 2001 (South China sea) [2] are considered. In these experiments NIW generated in area of the shelf break were moving approximately along acoustic track with the length about a few tens of km. Spectra of intensity fluctuations of the sound intensity of pulses during a few hours on vertical line array (VLA) due to mode coupling in both experiments have specific peaks corresponding to the difference between wave numbers of coupling pairs of modes. Analysis of fluctuation spectra includes both temporal dependence of fluctuations on separate hydrophones and temporal dependence of intensity summarized over VLA. It is shown that geoacoustic inversion in given case can be achieved using comparison of experimental spectral and temporal dependencies and results of theoretical modeling, containing bottom characteristics (sound speed density and attenuation) as a fitting parameters.

Original languageEnglish
Title of host publicationProceedings of the 23rd International Congress on Acoustics
Subtitle of host publicationIntegrating 4th EAA Euroregio 2019
EditorsMartin Ochmann, Vorlander Michael, Janina Fels
PublisherInternational Commission for Acoustics (ICA)
Pages5408-5415
Number of pages8
ISBN (Electronic)9783939296157
DOIs
StatePublished - 2019
Event23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019 - Aachen, Germany
Duration: 9 Sep 201923 Sep 2019

Publication series

NameProceedings of the International Congress on Acoustics
Volume2019-September
ISSN (Print)2226-7808
ISSN (Electronic)2415-1599

Conference

Conference23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019
Country/TerritoryGermany
CityAachen
Period9/09/1923/09/19

Bibliographical note

Funding Information:
Work was supported by ISF fund. Grant 565/15

Publisher Copyright:
© 2019 Proceedings of the International Congress on Acoustics. All rights reserved.

Keywords

  • Nonlinear internal waves
  • Shallow water sound propagation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Acoustics and Ultrasonics

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