High-resolution geoacoustic inversion in shallow water

A joint time- and frequency-domain technique

Charles Holland, John Osler

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

High-resolution geoacoustic data are required for accurate predictions of acoustic propagation and scattering in shallow water. Since direct measurement of geoacoustic data is difficult, time-consuming, and expensive, inversion of acoustic data is a promising alternative. However, the main problem encountered in geoacoustic inversion is the problem of uniqueness, i.e., many diverse geoacoustic models can be made to fit the same data set. A key, and perhaps unique, aspect of this approach is the combination of data analysis in both the space-time and the space-frequency domains. This combination attempts to ameliorate the uniqueness problem by exploiting as much independent data as possible. In order to meet the stringent requirements of high spatial resolution and uniqueness, an entire method has been developed including a new measurement technique, processing/analysis technique, and inversion strategy. These techniques are described and then illustrated with a shallow-water data set. Sound-speed gradients in the upper few meters of the sub-bottom appear to be much higher (one order of magnitude) than generally assumed. And, although often ignored, a large density gradient was observed in the top layer that played an acoustically significant role. (C) 2000 Acoustical Society of America.

Original languageEnglish (US)
Pages (from-to)1263-1279
Number of pages17
JournalJournal of the Acoustical Society of America
Volume107
Issue number3
DOIs
StatePublished - Mar 1 2000

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uniqueness
shallow water
inversions
high resolution
acoustic propagation
gradients
acoustic scattering
acoustics
spatial resolution
requirements
predictions
Water
Uniqueness
Inversion
Acoustics

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

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abstract = "High-resolution geoacoustic data are required for accurate predictions of acoustic propagation and scattering in shallow water. Since direct measurement of geoacoustic data is difficult, time-consuming, and expensive, inversion of acoustic data is a promising alternative. However, the main problem encountered in geoacoustic inversion is the problem of uniqueness, i.e., many diverse geoacoustic models can be made to fit the same data set. A key, and perhaps unique, aspect of this approach is the combination of data analysis in both the space-time and the space-frequency domains. This combination attempts to ameliorate the uniqueness problem by exploiting as much independent data as possible. In order to meet the stringent requirements of high spatial resolution and uniqueness, an entire method has been developed including a new measurement technique, processing/analysis technique, and inversion strategy. These techniques are described and then illustrated with a shallow-water data set. Sound-speed gradients in the upper few meters of the sub-bottom appear to be much higher (one order of magnitude) than generally assumed. And, although often ignored, a large density gradient was observed in the top layer that played an acoustically significant role. (C) 2000 Acoustical Society of America.",
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High-resolution geoacoustic inversion in shallow water : A joint time- and frequency-domain technique. / Holland, Charles; Osler, John.

In: Journal of the Acoustical Society of America, Vol. 107, No. 3, 01.03.2000, p. 1263-1279.

Research output: Contribution to journalArticle

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