Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks
Abstract Acoustic recordings of underwater sounds produced by marine mammals present an attractive alternative to costly and logistically complex ship based visual surveys for collecting population data for various species. The first reported use of underwater acoustic recordings in the long-term mo...
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ftunivneworleans:oai:scholarworks.uno.edu:td-4384 2024-02-11T10:08:55+01:00 Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks Drouant, George 2023-12-01T08:00:00Z application/pdf https://scholarworks.uno.edu/td/3128 https://scholarworks.uno.edu/context/td/article/4384/viewcontent/auto_convert.pdf https://scholarworks.uno.edu/context/td/article/4384/filename/0/type/additional/viewcontent/ThesisandDissertationApprovalForm_Data___2023_12_18T114447.033.pdf unknown ScholarWorks@UNO https://scholarworks.uno.edu/td/3128 https://scholarworks.uno.edu/context/td/article/4384/viewcontent/auto_convert.pdf https://scholarworks.uno.edu/context/td/article/4384/filename/0/type/additional/viewcontent/ThesisandDissertationApprovalForm_Data___2023_12_18T114447.033.pdf University of New Orleans Theses and Dissertations Signal Processing Underwater Acoustics Sperm Whales Wavelet Analysis Cepstrum Analysis Environmental Monitoring Oceanography Other Mathematics Other Physics text 2023 ftunivneworleans 2024-01-27T23:45:28Z Abstract Acoustic recordings of underwater sounds produced by marine mammals present an attractive alternative to costly and logistically complex ship based visual surveys for collecting population data for various species. The first reported use of underwater acoustic recordings in the long-term monitoring of sperm whale populations was by Ackleh et al. (Ackleh et al., 2012). The paper describes counting sperm whale clicks at different locations to track population changes over time. Analysis of sperm whale clicks offers additional insight into sperm whale populations. The echo location clicks (usual clicks) of sperm whales can be used to give an estimate of the whale’s length. The acoustic axis of the whale must be aligned with the hydrophone for accurate length estimates to be made. Most previously reported work using acoustics to measure whale lengths has been done with surface hydrophones recording clicks from a diving whale. With that geometry the whale’s acoustic axis will be approximately aligned with the hydrophone. In the case of monitoring a diving whale it is usual that most of the recorded clicks are from a single whale reducing interfering clicks from other whales. When recording clicks with bottom mounted hydrophones no whale/hydrophone orientation can be assumed. The vast majority of clicks recorded are from off axis whales and therefore produce inaccurate length measurements. It is also not unusual for several clicking whales to be recorded at the same time, producing incorrect whale length measurements due to interference between the clicks. Cepstrum Analysis is the favored technique for making acoustic whale length measurements from bottom moored hydrophones. If enough clicks are recorded from the same whale in enough different orientations, the spurious signals in off axis clicks are “averaged out”. It has been observed, however, that multiple whales clicking at the same time produced errors in the results from Cepstrum Analysis. In this paper a new method for selecting on axis sperm whale ... Text Sperm whale The University of New Orleans: ScholarWorks@UNO |
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Open Polar |
collection |
The University of New Orleans: ScholarWorks@UNO |
op_collection_id |
ftunivneworleans |
language |
unknown |
topic |
Signal Processing Underwater Acoustics Sperm Whales Wavelet Analysis Cepstrum Analysis Environmental Monitoring Oceanography Other Mathematics Other Physics |
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Signal Processing Underwater Acoustics Sperm Whales Wavelet Analysis Cepstrum Analysis Environmental Monitoring Oceanography Other Mathematics Other Physics Drouant, George Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks |
topic_facet |
Signal Processing Underwater Acoustics Sperm Whales Wavelet Analysis Cepstrum Analysis Environmental Monitoring Oceanography Other Mathematics Other Physics |
description |
Abstract Acoustic recordings of underwater sounds produced by marine mammals present an attractive alternative to costly and logistically complex ship based visual surveys for collecting population data for various species. The first reported use of underwater acoustic recordings in the long-term monitoring of sperm whale populations was by Ackleh et al. (Ackleh et al., 2012). The paper describes counting sperm whale clicks at different locations to track population changes over time. Analysis of sperm whale clicks offers additional insight into sperm whale populations. The echo location clicks (usual clicks) of sperm whales can be used to give an estimate of the whale’s length. The acoustic axis of the whale must be aligned with the hydrophone for accurate length estimates to be made. Most previously reported work using acoustics to measure whale lengths has been done with surface hydrophones recording clicks from a diving whale. With that geometry the whale’s acoustic axis will be approximately aligned with the hydrophone. In the case of monitoring a diving whale it is usual that most of the recorded clicks are from a single whale reducing interfering clicks from other whales. When recording clicks with bottom mounted hydrophones no whale/hydrophone orientation can be assumed. The vast majority of clicks recorded are from off axis whales and therefore produce inaccurate length measurements. It is also not unusual for several clicking whales to be recorded at the same time, producing incorrect whale length measurements due to interference between the clicks. Cepstrum Analysis is the favored technique for making acoustic whale length measurements from bottom moored hydrophones. If enough clicks are recorded from the same whale in enough different orientations, the spurious signals in off axis clicks are “averaged out”. It has been observed, however, that multiple whales clicking at the same time produced errors in the results from Cepstrum Analysis. In this paper a new method for selecting on axis sperm whale ... |
format |
Text |
author |
Drouant, George |
author_facet |
Drouant, George |
author_sort |
Drouant, George |
title |
Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks |
title_short |
Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks |
title_full |
Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks |
title_fullStr |
Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks |
title_full_unstemmed |
Measuring the Lengths of Sperm Whales of the Northern Gulf of Mexico by Wavelet Analysis of their Usual Clicks |
title_sort |
measuring the lengths of sperm whales of the northern gulf of mexico by wavelet analysis of their usual clicks |
publisher |
ScholarWorks@UNO |
publishDate |
2023 |
url |
https://scholarworks.uno.edu/td/3128 https://scholarworks.uno.edu/context/td/article/4384/viewcontent/auto_convert.pdf https://scholarworks.uno.edu/context/td/article/4384/filename/0/type/additional/viewcontent/ThesisandDissertationApprovalForm_Data___2023_12_18T114447.033.pdf |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_source |
University of New Orleans Theses and Dissertations |
op_relation |
https://scholarworks.uno.edu/td/3128 https://scholarworks.uno.edu/context/td/article/4384/viewcontent/auto_convert.pdf https://scholarworks.uno.edu/context/td/article/4384/filename/0/type/additional/viewcontent/ThesisandDissertationApprovalForm_Data___2023_12_18T114447.033.pdf |
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1790608567369203712 |