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Optimized constraints for the linear...

Ballard, Megan S.

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Optimized constraints for the linearized geoacoustic inverse problem.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Optimized constraints for the linearized geoacoustic inverse problem./
Author:	Ballard, Megan S.
Description:	222 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-03, Section: B, page: 1751.
Contained By:	Dissertation Abstracts International71-03B.
Subject:	Physical Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3399624
ISBN:	9781109659917

Optimized constraints for the linearized geoacoustic inverse problem.
Ballard, Megan S.

Optimized constraints for the linearized geoacoustic inverse problem. - 222 p.

Source: Dissertation Abstracts International, Volume: 71-03, Section: B, page: 1751.

Thesis (Ph.D.)--The Pennsylvania State University, 2009.

This work is concerned with developing inverse methods to estimate sound speed profiles of the water column and seabed in the shallow-water environment. The approaches are based on a perturbative technique which uses estimates of horizontal wave numbers to determine sound speed profiles. This technique is appropriate for the highly variable shallow-water environment as horizontal wave numbers can be measured semi-locally (1-2 km aperture) and their values are a direct measurement of the local environmental properties. In all previous applications of this technique, this inversion scheme has been used to estimate sound speed in the seabed at a number of discrete depths while assuming water column properties are known.

ISBN: 9781109659917Subjects--Topical Terms:

1019163
Physical Oceanography.

Optimized constraints for the linearized geoacoustic inverse problem.
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035 $a (UMI)AAI3399624
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040 $a UMI $c UMI
100 1 $a Ballard, Megan S. $3 1683756
245 1 0 $a Optimized constraints for the linearized geoacoustic inverse problem.
300 $a 222 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-03, Section: B, page: 1751.
500 $a Adviser: Kyle M. Becker.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2009.
520 $a This work is concerned with developing inverse methods to estimate sound speed profiles of the water column and seabed in the shallow-water environment. The approaches are based on a perturbative technique which uses estimates of horizontal wave numbers to determine sound speed profiles. This technique is appropriate for the highly variable shallow-water environment as horizontal wave numbers can be measured semi-locally (1-2 km aperture) and their values are a direct measurement of the local environmental properties. In all previous applications of this technique, this inversion scheme has been used to estimate sound speed in the seabed at a number of discrete depths while assuming water column properties are known.
520 $a Compared to past applications of perturbative inversion, the accuracy of the solution is improved by implementing more suitable constraints to address issues of stability and uniqueness associated with solving the ill-posed inverse problem. One such improvement uses qualitative regularization which allows for discontinuities in the sediment sound speed profile to be resolved. The resulting solution is a more accurate representation of the layered structure of the seabed. Another advancement makes reliable inversion for water column properties possible. This is accomplished using approximate equality constraints to address the solution's instability in portions of the waveguide for which the wave number data are insensitive. A further enhancement uses a synthesis of qualitative regularization and approximate equality constraints to provide a mechanism to efficiently invert for sediment and water column sound speed profiles simultaneously. This technique allows for rapid assessment of the water column and the seabed properties in a single step.
590 $a School code: 0176.
650 4 $a Physical Oceanography. $3 1019163
650 4 $a Marine Geology. $3 1674685
650 4 $a Physics, Acoustics. $3 1019086
690 $a 0415
690 $a 0556
690 $a 0986
710 2 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 71-03B.
790 1 0 $a Becker, Kyle M., $e advisor
790 $a 0176
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3399624