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The Detectability of Goliath Grouper...

Marcheggiani, Joseph P.,

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The Detectability of Goliath Grouper Sounds in Nearshore Waters Using a Normal Modes Propagation Model /

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Detectability of Goliath Grouper Sounds in Nearshore Waters Using a Normal Modes Propagation Model // Joseph P Marcheggiani.
Author:	Marcheggiani, Joseph P.,
Description:	1 electronic resource (182 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
Contained By:	Dissertations Abstracts International85-11B.
Subject:	Acoustics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31143140
ISBN:	9798382594095

The Detectability of Goliath Grouper Sounds in Nearshore Waters Using a Normal Modes Propagation Model /
Marcheggiani, Joseph P.,

The Detectability of Goliath Grouper Sounds in Nearshore Waters Using a Normal Modes Propagation Model /Joseph P Marcheggiani. - 1 electronic resource (182 pages)

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

This research presents findings from an in-situ experiment utilizing a hydrophone line array to capture the sound production of the Goliath grouper. Analysis revealed that Goliath grouper calls exhibit multiple frequency components, including one high-amplitude component and 2 to 3 low-amplitude components. The primary high-amplitude component is concentrated in the 30 to 70 Hz band, peaking around 50 Hz, while low-amplitude components span 20 to 30 Hz, 70 to 115 Hz, and 130 to 200 Hz. Comparison between in-situ data and results from a normal modes transmission loss model identified regions where echo level increased with propagation distance. This suggests that the loudness of the call may not necessarily indicate proximity, indicating the Goliath grouper might rely on other cues for localization, such as changes in the frequency profile of its call. Two methods for estimating call distance are presented. The first method utilized a transmission loss model and measured transmission loss across a hydrophone line array. This method could also determine the source level of the calls, yielding source level estimates ranging from 124.01 to 144.83 dB re 1 μPa. The second method employed match field filtering, validating the accuracy of the transmission loss model. Both methods produced similar call distance estimations, ranging from 11.5 to 17.1 meters, placing the grouper inside or near its typical habitat. The recorded calls and transmission loss model both showed that the transmission loss per frequency band varied, affecting the call frequency magnitude structure over distance. The accuracy of the matched filter can be improved for automatic call detection by using multiple templates. The matched filter was able to detect all 5 calls that were studied in this paper, with the furthest call being 120 meters away. Detecting a call at further distances may be possible depending on the magnitude of the call and the signal-to-noise ratio. A call could theoretically be detected up to 2,396 m away with a probability of detection of 99.99% and a probability of a false alarm of 5% by using a detection threshold of 4 dB.

English

ISBN: 9798382594095Subjects--Topical Terms:

879105
Acoustics.
Subjects--Index Terms:

Goliath grouper

The Detectability of Goliath Grouper Sounds in Nearshore Waters Using a Normal Modes Propagation Model /
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245 1 0 $a The Detectability of Goliath Grouper Sounds in Nearshore Waters Using a Normal Modes Propagation Model / $c Joseph P Marcheggiani.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (182 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
500 $a Advisors: Cherubin, Laurent Committee members: Beaujean, Pierre-Philippe; Zhuang, Hanqi; Nayak, Aditya.
502 $b Ph.D. $c Florida Atlantic University $d 2024.
520 $a This research presents findings from an in-situ experiment utilizing a hydrophone line array to capture the sound production of the Goliath grouper. Analysis revealed that Goliath grouper calls exhibit multiple frequency components, including one high-amplitude component and 2 to 3 low-amplitude components. The primary high-amplitude component is concentrated in the 30 to 70 Hz band, peaking around 50 Hz, while low-amplitude components span 20 to 30 Hz, 70 to 115 Hz, and 130 to 200 Hz. Comparison between in-situ data and results from a normal modes transmission loss model identified regions where echo level increased with propagation distance. This suggests that the loudness of the call may not necessarily indicate proximity, indicating the Goliath grouper might rely on other cues for localization, such as changes in the frequency profile of its call. Two methods for estimating call distance are presented. The first method utilized a transmission loss model and measured transmission loss across a hydrophone line array. This method could also determine the source level of the calls, yielding source level estimates ranging from 124.01 to 144.83 dB re 1 μPa. The second method employed match field filtering, validating the accuracy of the transmission loss model. Both methods produced similar call distance estimations, ranging from 11.5 to 17.1 meters, placing the grouper inside or near its typical habitat. The recorded calls and transmission loss model both showed that the transmission loss per frequency band varied, affecting the call frequency magnitude structure over distance. The accuracy of the matched filter can be improved for automatic call detection by using multiple templates. The matched filter was able to detect all 5 calls that were studied in this paper, with the furthest call being 120 meters away. Detecting a call at further distances may be possible depending on the magnitude of the call and the signal-to-noise ratio. A call could theoretically be detected up to 2,396 m away with a probability of detection of 99.99% and a probability of a false alarm of 5% by using a detection threshold of 4 dB.
546 $a English
590 $a School code: 0119
650 4 $a Acoustics. $3 879105
650 4 $a Ocean engineering. $3 660731
650 4 $a Fluid mechanics. $3 528155
653 $a Goliath grouper
653 $a Normal modes
653 $a Propagation
653 $a Sound
653 $a Transmission loss
690 $a 0986
690 $a 0547
690 $a 0204
710 2 $a Florida Atlantic University. $b Ocean Engineering. $e degree granting institution. $3 3816827
720 1 $a Cherubin, Laurent $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 85-11B.
790 $a 0119
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31143140