Measurements of two-dimensional spatial coherence of normal-incidence seafloor scattering

Daniel C. Brown, Cale F. Brownstead, Anthony P. Lyons, Thomas B. Gabrielson

Research output: Contribution to journalArticle

Abstract

Measurements have been made near normal incidence of the two-dimensional spatial coherence of the acoustic field scattered from the lakebed in Seneca Lake, New York. In the test region, the lakebed consists of a series of sediment layers created by a sequence of distinct depositional processes. The spatial coherence length of the scattered field is shown to be dependent on the structure of the underlying sediment sequences. Significant ping-to-ping variability in the spatial coherence surface was also observed for each sediment sequence. This variability is quantified by a two-dimensional spatial coherence metric that measures the coherence lengths and asymmetric coherence surface orientation. The ping-to-ping variation of the surface asymmetry appears to be linked to the spatial isotropy of the sediment scattering strength. The scattering strength of the deepest observed sequence in the sub-bottom is the most spatially isotropic and the ping-to-ping variability of the coherence lengths and surface orientations are random. The scattering strength of the shallower sequences is spatially anisotropic and the coherence lengths and surface orientations show intervals of non-random ping-to-ping behavior.

Original languageEnglish (US)
Pages (from-to)2095-2108
Number of pages14
JournalJournal of the Acoustical Society of America
Volume144
Issue number4
DOIs
StatePublished - Oct 1 2018

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incidence
scattering
sediments
spatial isotropy
lakes
asymmetry
intervals
acoustics
Length
Sediment

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

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abstract = "Measurements have been made near normal incidence of the two-dimensional spatial coherence of the acoustic field scattered from the lakebed in Seneca Lake, New York. In the test region, the lakebed consists of a series of sediment layers created by a sequence of distinct depositional processes. The spatial coherence length of the scattered field is shown to be dependent on the structure of the underlying sediment sequences. Significant ping-to-ping variability in the spatial coherence surface was also observed for each sediment sequence. This variability is quantified by a two-dimensional spatial coherence metric that measures the coherence lengths and asymmetric coherence surface orientation. The ping-to-ping variation of the surface asymmetry appears to be linked to the spatial isotropy of the sediment scattering strength. The scattering strength of the deepest observed sequence in the sub-bottom is the most spatially isotropic and the ping-to-ping variability of the coherence lengths and surface orientations are random. The scattering strength of the shallower sequences is spatially anisotropic and the coherence lengths and surface orientations show intervals of non-random ping-to-ping behavior.",
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Measurements of two-dimensional spatial coherence of normal-incidence seafloor scattering. / Brown, Daniel C.; Brownstead, Cale F.; Lyons, Anthony P.; Gabrielson, Thomas B.

In: Journal of the Acoustical Society of America, Vol. 144, No. 4, 01.10.2018, p. 2095-2108.

Research output: Contribution to journalArticle

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