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Studies Using Underwater Acoustic Tr...

Snyder, Eric R.

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Studies Using Underwater Acoustic Tracking Arrays.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Studies Using Underwater Acoustic Tracking Arrays./
Author:	Snyder, Eric R.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
Description:	100 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
Contained By:	Dissertations Abstracts International85-10B.
Subject:	Acoustics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30994450
ISBN:	9798382302409

Studies Using Underwater Acoustic Tracking Arrays.
Snyder, Eric R.

Studies Using Underwater Acoustic Tracking Arrays. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 100 p.

Source: Dissertations Abstracts International, Volume: 85-10, Section: B.

Thesis (Ph.D.)--University of California, San Diego, 2024.

The oceans contain a cacophony of sounds from biological, geological, meteorological, and anthropogenic sources. As computational power and data storage capabilities have increased, long-term passive acoustic recordings have been increasingly employed to study the oceans. Multiple hydrophones can be deployed in a site or region to gain more information on the spatial properties of acoustic soundscapes. In this thesis, we use hydrophone arrays to track vocalizing animals and anthropogenic sound sources, and by so doing gain valuable insights into ocean environments.Chapter 1 introduces Where's Whaledo: software toolkit and workflow for efficiently and reliably localizing and tracking groups of vocalizing animals. Methods were developed to identify and remove false detections in small-aperture direction of arrival estimates, associate detections across widely-spaced instruments using click trains, estimate source locations, and calculate confidence intervals.Chapter 2 employs Where's Whaledo on Ziphius cavirostris (Zc) in the Tanner Basin, demonstrating the toolkit's capabilities by reconstructing the tracks of 143 dives. The localized animals demonstrated a preference for the steeper bathymetry at the study site, as well as a possible preference for swimming in groups of two or more animals. 12 of these tracks were used to estimate the beam pattern of a Zc echolocation click.Chapter 3 demonstrates the challenges and complexities of long-range propagation by examining recordings of five vessels performing a coordinated seismic survey using high-intensity signals from airgun arrays. Using several identifiable patterns in the acoustic data, each arrival in a 110-minute period was associated with its source vessel so changes in dispersion patterns could be observed over time. Both ray trace and parabolic equation models were used to simulate dispersion patterns. Potential causes of differences between the modeled signals and the observed signals are discussed, and recommendations are made for future analyses.

ISBN: 9798382302409Subjects--Topical Terms:

879105
Acoustics.
Subjects--Index Terms:

Ocean acoustics

Studies Using Underwater Acoustic Tracking Arrays.
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245 1 0 $a Studies Using Underwater Acoustic Tracking Arrays.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 100 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
500 $a Advisor: Hildebrand, John A.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2024.
520 $a The oceans contain a cacophony of sounds from biological, geological, meteorological, and anthropogenic sources. As computational power and data storage capabilities have increased, long-term passive acoustic recordings have been increasingly employed to study the oceans. Multiple hydrophones can be deployed in a site or region to gain more information on the spatial properties of acoustic soundscapes. In this thesis, we use hydrophone arrays to track vocalizing animals and anthropogenic sound sources, and by so doing gain valuable insights into ocean environments.Chapter 1 introduces Where's Whaledo: software toolkit and workflow for efficiently and reliably localizing and tracking groups of vocalizing animals. Methods were developed to identify and remove false detections in small-aperture direction of arrival estimates, associate detections across widely-spaced instruments using click trains, estimate source locations, and calculate confidence intervals.Chapter 2 employs Where's Whaledo on Ziphius cavirostris (Zc) in the Tanner Basin, demonstrating the toolkit's capabilities by reconstructing the tracks of 143 dives. The localized animals demonstrated a preference for the steeper bathymetry at the study site, as well as a possible preference for swimming in groups of two or more animals. 12 of these tracks were used to estimate the beam pattern of a Zc echolocation click.Chapter 3 demonstrates the challenges and complexities of long-range propagation by examining recordings of five vessels performing a coordinated seismic survey using high-intensity signals from airgun arrays. Using several identifiable patterns in the acoustic data, each arrival in a 110-minute period was associated with its source vessel so changes in dispersion patterns could be observed over time. Both ray trace and parabolic equation models were used to simulate dispersion patterns. Potential causes of differences between the modeled signals and the observed signals are discussed, and recommendations are made for future analyses.
590 $a School code: 0033.
650 4 $a Acoustics. $3 879105
650 4 $a Ocean engineering. $3 660731
650 4 $a Biological oceanography. $3 2122748
653 $a Ocean acoustics
653 $a Passive acoustic recordings
653 $a Ziphius cavirostris
653 $a Underwater
690 $a 0986
690 $a 0547
690 $a 0416
710 2 $a University of California, San Diego. $b Scripps Institution of Oceanography. $3 3543449
773 0 $t Dissertations Abstracts International $g 85-10B.
790 $a 0033
791 $a Ph.D.
792 $a 2024
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30994450