Theoretical and experimental studies of seafloor backscatter

Analysis of seafloor backscatter collected from single and multi beam echosounders (SBES and MBES) has been carried out using a theoretical model and experimental data. The aim of this work was to evaluate backscatter parameters for the purposes of seafloor habitat classification. A theoretical mode...

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Autor: Torres Medina, Mª Desamparados
Tipo de recurso: tesis de maestría
Fecha de publicación:2010
País:España
Institución:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/8989
Acceso en línea:https://riunet.upv.es/handle/10251/8989
Access Level:acceso abierto
Palabra clave:Máster Universitario en Ingeniería Acústica-Màster Universitari en Enginyeria Acústica
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spelling Theoretical and experimental studies of seafloor backscatterTorres Medina, Mª DesamparadosMáster Universitario en Ingeniería Acústica-Màster Universitari en Enginyeria AcústicaAnalysis of seafloor backscatter collected from single and multi beam echosounders (SBES and MBES) has been carried out using a theoretical model and experimental data. The aim of this work was to evaluate backscatter parameters for the purposes of seafloor habitat classification. A theoretical model developed by CMST was used to study the backscatter properties depending on seafloor properties, depth and transmit pulse width. Peak intensity and energy calculated from the predicted mean envelop for different sediment types were shown to be proportional to the backscatter coefficient. Integration of the tail of the envelope, which results in a commonly used backscatter parameter E1, shows that accurate calculation of the insonfication area is required to make it independent of depth. The effective pulse width of seafloor echoes was found to be proportional to the backscatter coefficient and highly dependent on the transmit pulse width and depth. Experimental measurements using a Simrad EQ60 single beam echo-sounder, operating at 38 and 200 kHz, were made to distinguish different seafloor habitats. The energy and parameter E1 at 200 kHz were the most useful parameters for discriminating different seafloor habitats and the resulting classification was consistent between different transects across the same area of the seafloor. In addition, temporal variations of backscatter from seagrass were studied. This experiment showed unexpectedly small temporal variations in the mean backscatter characteristics, both intensity and energy, at 200 kHz. Subtle diurnal variations were observed in the mean backscatter intensity at 38 kHz. Statistics of backscatter from seagrass was analysed at both frequencies pointing out a complex, rather bimodal distribution observed in the fluctuations of the instantaneous backscatter intensity.Universitat Politècnica de ValènciaParnum, Iain MichaelGavrilov, AlexanderEspinosa Roselló, VíctorDepartamento de Física AplicadaEscuela Politécnica Superior de GandiaInstituto de Investigación para la Gestión Integrada de Zonas CosterasRepositorio Institucional de la Universitat Politècnica de València Riunet20102010-12-2020102010-07-15master thesishttp://purl.org/coar/resource_type/c_bdccinfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfhttps://riunet.upv.es/handle/10251/8989reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valénciainstname:Universitat Politècnica de València (UPV)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Reserva de todos los derechoshttp://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:riunet.upv.es:10251/89892026-06-13T07:49:27Z
dc.title.none.fl_str_mv Theoretical and experimental studies of seafloor backscatter
title Theoretical and experimental studies of seafloor backscatter
spellingShingle Theoretical and experimental studies of seafloor backscatter
Torres Medina, Mª Desamparados
Máster Universitario en Ingeniería Acústica-Màster Universitari en Enginyeria Acústica
title_short Theoretical and experimental studies of seafloor backscatter
title_full Theoretical and experimental studies of seafloor backscatter
title_fullStr Theoretical and experimental studies of seafloor backscatter
title_full_unstemmed Theoretical and experimental studies of seafloor backscatter
title_sort Theoretical and experimental studies of seafloor backscatter
dc.creator.none.fl_str_mv Torres Medina, Mª Desamparados
author Torres Medina, Mª Desamparados
author_facet Torres Medina, Mª Desamparados
author_role author
dc.contributor.none.fl_str_mv Parnum, Iain Michael
Gavrilov, Alexander
Espinosa Roselló, Víctor
Departamento de Física Aplicada
Escuela Politécnica Superior de Gandia
Instituto de Investigación para la Gestión Integrada de Zonas Costeras
Repositorio Institucional de la Universitat Politècnica de València Riunet
dc.subject.none.fl_str_mv Máster Universitario en Ingeniería Acústica-Màster Universitari en Enginyeria Acústica
topic Máster Universitario en Ingeniería Acústica-Màster Universitari en Enginyeria Acústica
description Analysis of seafloor backscatter collected from single and multi beam echosounders (SBES and MBES) has been carried out using a theoretical model and experimental data. The aim of this work was to evaluate backscatter parameters for the purposes of seafloor habitat classification. A theoretical model developed by CMST was used to study the backscatter properties depending on seafloor properties, depth and transmit pulse width. Peak intensity and energy calculated from the predicted mean envelop for different sediment types were shown to be proportional to the backscatter coefficient. Integration of the tail of the envelope, which results in a commonly used backscatter parameter E1, shows that accurate calculation of the insonfication area is required to make it independent of depth. The effective pulse width of seafloor echoes was found to be proportional to the backscatter coefficient and highly dependent on the transmit pulse width and depth. Experimental measurements using a Simrad EQ60 single beam echo-sounder, operating at 38 and 200 kHz, were made to distinguish different seafloor habitats. The energy and parameter E1 at 200 kHz were the most useful parameters for discriminating different seafloor habitats and the resulting classification was consistent between different transects across the same area of the seafloor. In addition, temporal variations of backscatter from seagrass were studied. This experiment showed unexpectedly small temporal variations in the mean backscatter characteristics, both intensity and energy, at 200 kHz. Subtle diurnal variations were observed in the mean backscatter intensity at 38 kHz. Statistics of backscatter from seagrass was analysed at both frequencies pointing out a complex, rather bimodal distribution observed in the fluctuations of the instantaneous backscatter intensity.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-12-20
2010
2010-07-15
dc.type.none.fl_str_mv master thesis
http://purl.org/coar/resource_type/c_bdcc
dc.type.openaire.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
dc.identifier.none.fl_str_mv https://riunet.upv.es/handle/10251/8989
url https://riunet.upv.es/handle/10251/8989
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reserva de todos los derechos
http://rightsstatements.org/vocab/InC/1.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reserva de todos los derechos
http://rightsstatements.org/vocab/InC/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat Politècnica de València
publisher.none.fl_str_mv Universitat Politècnica de València
dc.source.none.fl_str_mv reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname:Universitat Politècnica de València (UPV)
instname_str Universitat Politècnica de València (UPV)
reponame_str RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
collection RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
repository.name.fl_str_mv
repository.mail.fl_str_mv
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