Evidence for a common scale O(0.1) m controlling seabed scattering and reverberation in shallow water regions

Research output: Contribution to journalConference article

Abstract

Long-range reverberation spectral analysis yields two observations. Firstly, there is a remarkably similar scale, O(0.1)m, between 3 diverse continental shelf regions. This is surprising given general understanding of the complexity and diversity of geologic processes. Secondly, there is strong evidence that the scale is associated with heterogeneities within the sediment. Thus sediment volume scattering, not interface scattering, controls long-range reverberation from a few hundred Hertz to several kiloHertz. This is also unexpected given that at long-ranges the vertical grazing angles are less than the critical angle, and hence the penetration of the acoustic field into the sub-bottom is expected to be modest. The consistency of the scale, O(0. 1)m, suggests an underlying feature or mechanism that is consistent across many ostensibly diverse geological settings. The most likely mechanism is scattering from mollusks.

Original languageEnglish (US)
Article number070008
JournalProceedings of Meetings on Acoustics
Volume19
DOIs
StatePublished - Jun 19 2013
Event21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada
Duration: Jun 2 2013Jun 7 2013

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reverberation
shallow water
sediments
mollusks
scattering
grazing
continental shelves
spectrum analysis
penetration
acoustics

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

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title = "Evidence for a common scale O(0.1) m controlling seabed scattering and reverberation in shallow water regions",
abstract = "Long-range reverberation spectral analysis yields two observations. Firstly, there is a remarkably similar scale, O(0.1)m, between 3 diverse continental shelf regions. This is surprising given general understanding of the complexity and diversity of geologic processes. Secondly, there is strong evidence that the scale is associated with heterogeneities within the sediment. Thus sediment volume scattering, not interface scattering, controls long-range reverberation from a few hundred Hertz to several kiloHertz. This is also unexpected given that at long-ranges the vertical grazing angles are less than the critical angle, and hence the penetration of the acoustic field into the sub-bottom is expected to be modest. The consistency of the scale, O(0. 1)m, suggests an underlying feature or mechanism that is consistent across many ostensibly diverse geological settings. The most likely mechanism is scattering from mollusks.",
author = "Charles Holland",
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journal = "Proceedings of Meetings on Acoustics",
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AU - Holland, Charles

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AB - Long-range reverberation spectral analysis yields two observations. Firstly, there is a remarkably similar scale, O(0.1)m, between 3 diverse continental shelf regions. This is surprising given general understanding of the complexity and diversity of geologic processes. Secondly, there is strong evidence that the scale is associated with heterogeneities within the sediment. Thus sediment volume scattering, not interface scattering, controls long-range reverberation from a few hundred Hertz to several kiloHertz. This is also unexpected given that at long-ranges the vertical grazing angles are less than the critical angle, and hence the penetration of the acoustic field into the sub-bottom is expected to be modest. The consistency of the scale, O(0. 1)m, suggests an underlying feature or mechanism that is consistent across many ostensibly diverse geological settings. The most likely mechanism is scattering from mollusks.

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