On the Feasibility of a Matched-Field Inversion in a Three-Dimensional Oceanic Environment Ignoring Out-of-Plane Propagation

Korakas, Alexios; Sturm, Frédéric

doi:10.1109/joe.2011.2157730

Cited by 2 publications

(2 citation statements)

References 28 publications

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“…In a recent work, it was shown that the slope effect onto inversions of simulated vertical array data in a 3-D wedge test case can be neglected at relatively short ranges from the source. 28 In other words, an inversion based on a 2-D model succeeds in retrieving the correct parameter values at short ranges. Applying this observation to the actual experimental context suggests that an inversion of vertical array data be performed in two steps as follows.…”

Section: Inversion Setupmentioning

confidence: 99%

“…Furthermore, it was shown that the objective function is highly sensitive to the slope whenever the array is positioned in the vicinity of the caustic or cut-off range of a single mode. 28 This observation is useful for choosing appropriate vertical array ranges in the second step. The two-step inversion approach can thus be applied on the ASP-V data set (described in Sec.…”

Section: Inversion Setupmentioning

confidence: 99%

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Comparisons of laboratory scale measurements of three-dimensional acoustic propagation with solutions by a parabolic equation model

Sturm

Korakas

2013

The Journal of the Acoustical Society of America

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In this paper, laboratory scale measurements of long range across-slope acoustic propagation in a three-dimensional (3-D) wedge-like environment are compared to numerical solutions. In a previous work, it was shown that the experimental data contain strong 3-D effects like mode shadow zones and multiple mode arrivals, in qualitative agreement with theoretical and numerical predictions. In the present work, the experimental data are compared with numerical solutions obtained using a fully 3-D parabolic equation based model. A subspace inversion approach is used for the refinement of some of the parameters describing the model experiment. The inversion procedure is implemented in a Bayesian framework based on the exhaustive search over the parameter space. The comparisons are performed both in the time and in the frequency domain using the maximum a posteriori estimates of the refined parameters as input in the 3-D model. A very good quantitative agreement is achieved between the numerical predictions provided by the 3-D parabolic equation model and the experimental data.

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Section: Inversion Setupmentioning

confidence: 99%

Section: Inversion Setupmentioning

confidence: 99%

Comparisons of laboratory scale measurements of three-dimensional acoustic propagation with solutions by a parabolic equation model

Sturm

Korakas

2013

The Journal of the Acoustical Society of America

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Normal mode dispersion and time warping in the coastal ocean

Godin

Katsnelson

Tan

2019

The Journal of the Acoustical Society of America

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Simple, analytically solvable models of normal mode propagation in the coastal ocean are developed and applied to study the effect of the seafloor bathymetry on modal travel times. Within the adiabatic approximation, horizontal inhomogeneity of the waveguide is found to change the modal dispersion curves in a way that helps separation of the modal components of the acoustic field using the time-warping transform. It is shown that moderate seafloor slopes can lead to surprisingly large errors in retrieved geoacoustic parameters and cause a positive bias in bottom sound speed estimates if horizontal refraction is ignored.

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On the Feasibility of a Matched-Field Inversion in a Three-Dimensional Oceanic Environment Ignoring Out-of-Plane Propagation

Cited by 2 publications

References 28 publications

Comparisons of laboratory scale measurements of three-dimensional acoustic propagation with solutions by a parabolic equation model

Comparisons of laboratory scale measurements of three-dimensional acoustic propagation with solutions by a parabolic equation model

Normal mode dispersion and time warping in the coastal ocean

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