Dual-frequency acoustic seabed classification on the Scotian shelf, Canada
Thesis (M.Sc.)--Memorial University of Newfoundland, 2011. Geography Bibliography: leaves 159-164. Acoustic seabed classification is typically done using single acoustic frequencies, although it is known that different frequencies can potentially provide additional information on the seabed. This th...
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ftmemorialunivdc:oai:collections.mun.ca:theses5/11716 2023-05-15T17:23:28+02:00 Dual-frequency acoustic seabed classification on the Scotian shelf, Canada Cuff, Andrew, 1985- Memorial University of Newfoundland. Dept. of Geography Canada--Scotian Shelf 2011 xiv, 198 leaves : col. ill., maps Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/11716 Eng eng Electronic Theses and Dissertations (22.89 MB) -- http://collections.mun.ca/PDFs/theses/Cuff_Andrew.pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/11716 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Ocean bottom--Canada--Scotian Shelf Underwater acoustics--Canada--Scotian Shelf Continental shelf--Canada--Scotian Shelf Ocean bottom ecology--Canada--Scotian Shelf Text Electronic thesis or dissertation 2011 ftmemorialunivdc 2015-08-06T19:22:48Z Thesis (M.Sc.)--Memorial University of Newfoundland, 2011. Geography Bibliography: leaves 159-164. Acoustic seabed classification is typically done using single acoustic frequencies, although it is known that different frequencies can potentially provide additional information on the seabed. This thesis explores the potential of using two acoustic frequencies, 38 kHz and 120 kHz, from a single beam echo sounder for acoustic seabed classification on the Scotian Shelf, Canada. The main goals were to assess the characteristics of near-nadir acoustic backscatter as a function of seabed substrate properties and acoustic frequency, analyze differences in frequency response at different spatial scales, and to compare single frequency and dual-frequency classifications of seabed substrate types. Univariate and multivariate statistical methods were used to determine the statistical characteristics of single and dual-frequency near-nadir acoustic backscatter and to identify frequency differences. Both supervised and unsupervised classification techniques were used to classify the data. Results revealed trends in dual-frequency near-nadir backscatter such as higher frequencies and larger sediments generally produce higher backscatter and more heterogeneous and rough seabeds produce variable backscatter. It was found that differences in frequency responses of backscatter occurred at scales of hundreds of meters. Finally, it was concluded that dual-frequency classification improved upon single frequency classification at near-nadir incidence angles. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Canada |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Ocean bottom--Canada--Scotian Shelf Underwater acoustics--Canada--Scotian Shelf Continental shelf--Canada--Scotian Shelf Ocean bottom ecology--Canada--Scotian Shelf |
spellingShingle |
Ocean bottom--Canada--Scotian Shelf Underwater acoustics--Canada--Scotian Shelf Continental shelf--Canada--Scotian Shelf Ocean bottom ecology--Canada--Scotian Shelf Cuff, Andrew, 1985- Dual-frequency acoustic seabed classification on the Scotian shelf, Canada |
topic_facet |
Ocean bottom--Canada--Scotian Shelf Underwater acoustics--Canada--Scotian Shelf Continental shelf--Canada--Scotian Shelf Ocean bottom ecology--Canada--Scotian Shelf |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 2011. Geography Bibliography: leaves 159-164. Acoustic seabed classification is typically done using single acoustic frequencies, although it is known that different frequencies can potentially provide additional information on the seabed. This thesis explores the potential of using two acoustic frequencies, 38 kHz and 120 kHz, from a single beam echo sounder for acoustic seabed classification on the Scotian Shelf, Canada. The main goals were to assess the characteristics of near-nadir acoustic backscatter as a function of seabed substrate properties and acoustic frequency, analyze differences in frequency response at different spatial scales, and to compare single frequency and dual-frequency classifications of seabed substrate types. Univariate and multivariate statistical methods were used to determine the statistical characteristics of single and dual-frequency near-nadir acoustic backscatter and to identify frequency differences. Both supervised and unsupervised classification techniques were used to classify the data. Results revealed trends in dual-frequency near-nadir backscatter such as higher frequencies and larger sediments generally produce higher backscatter and more heterogeneous and rough seabeds produce variable backscatter. It was found that differences in frequency responses of backscatter occurred at scales of hundreds of meters. Finally, it was concluded that dual-frequency classification improved upon single frequency classification at near-nadir incidence angles. |
author2 |
Memorial University of Newfoundland. Dept. of Geography |
format |
Thesis |
author |
Cuff, Andrew, 1985- |
author_facet |
Cuff, Andrew, 1985- |
author_sort |
Cuff, Andrew, 1985- |
title |
Dual-frequency acoustic seabed classification on the Scotian shelf, Canada |
title_short |
Dual-frequency acoustic seabed classification on the Scotian shelf, Canada |
title_full |
Dual-frequency acoustic seabed classification on the Scotian shelf, Canada |
title_fullStr |
Dual-frequency acoustic seabed classification on the Scotian shelf, Canada |
title_full_unstemmed |
Dual-frequency acoustic seabed classification on the Scotian shelf, Canada |
title_sort |
dual-frequency acoustic seabed classification on the scotian shelf, canada |
publishDate |
2011 |
url |
http://collections.mun.ca/cdm/ref/collection/theses5/id/11716 |
op_coverage |
Canada--Scotian Shelf |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (22.89 MB) -- http://collections.mun.ca/PDFs/theses/Cuff_Andrew.pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/11716 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766112457983524864 |