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The effects of random bottom bathyme...

Wylie, Jennifer Leigh.

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The effects of random bottom bathymetry on coherence in shallow water acoustic propagation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The effects of random bottom bathymetry on coherence in shallow water acoustic propagation./
Author:	Wylie, Jennifer Leigh.
Description:	82 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
Contained By:	Dissertation Abstracts International75-05B(E).
Subject:	Acoustics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3609403
ISBN:	9781303682445

The effects of random bottom bathymetry on coherence in shallow water acoustic propagation.
Wylie, Jennifer Leigh.

The effects of random bottom bathymetry on coherence in shallow water acoustic propagation. - 82 p.

Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.

Thesis (Ph.D.)--University of Miami, 2013.

This item must not be sold to any third party vendors.

In an ideal shallow water propagation channel the sound field is accurately described by normal modes and the mode structure is predictable with clean separated modes. However the real ocean environment is rarely ideal, and variations in bottom bathymetry and water column sound speed are usually present. Random fluctuations of the sound speed in time, space, and/or the boundaries can distort modes such that phase coherence is reduced and under some conditions completely lost.

ISBN: 9781303682445Subjects--Topical Terms:

879105
Acoustics.

The effects of random bottom bathymetry on coherence in shallow water acoustic propagation.
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020 $a 9781303682445
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035 $a AAI3609403
040 $a MiAaPQ $c MiAaPQ
100 1 $a Wylie, Jennifer Leigh. $3 3175829
245 1 4 $a The effects of random bottom bathymetry on coherence in shallow water acoustic propagation.
300 $a 82 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
500 $a Adviser: Harry A. DeFerrari.
502 $a Thesis (Ph.D.)--University of Miami, 2013.
506 $a This item must not be sold to any third party vendors.
520 $a In an ideal shallow water propagation channel the sound field is accurately described by normal modes and the mode structure is predictable with clean separated modes. However the real ocean environment is rarely ideal, and variations in bottom bathymetry and water column sound speed are usually present. Random fluctuations of the sound speed in time, space, and/or the boundaries can distort modes such that phase coherence is reduced and under some conditions completely lost.
520 $a The basic research community seeks to understand the effects of internal waves on temporal coherence. Here the study method of choice is to use fixed system experiments that observe both oceanographic and acoustical fluctuations. On the other hand applied Naval research is focused on using mobile platforms to instantaneously measure spatial coherence shipboard, and they have little to no interest in measuring long term coherence.
520 $a Here we seek to present a unified theory using normal modes. Both spatial and temporal coherence as well as the effects of source motion and Doppler will be addressed. Mode structure can be randomized in two ways: sound speed fluctuations and boundary variations. The research proposed here will emphasize spatial variations of the bottom bathymetry and how they affect mode arrivals. A parabolic equation model is used to predict mode shapes in a range dependent environment and random variations in bottom boundaries will be introduced and distortion in the mode arrival structure will be observed. The mode arrival structures will then be used to estimate temporal and spatial coherence of the mode arrivals and the predictions will be compared to the data from three different shallow water experiments.
590 $a School code: 0125.
650 4 $a Acoustics. $3 879105
650 4 $a Ocean engineering. $3 660731
690 $a 0986
690 $a 0547
710 2 $a University of Miami. $b Applied Marine Physics (Marine). $3 3175828
773 0 $t Dissertation Abstracts International $g 75-05B(E).
790 $a 0125
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3609403