SOFAR signal shaping : influence of topography and relative source depth

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dc.contributor.advisorBrundrit, Geoffen_ZA
dc.contributor.authorKrige, Leonen_ZA
dc.date.accessioned2014-11-19T06:47:46Z
dc.date.available2014-11-19T06:47:46Z
dc.date.issued2000en_ZA
dc.descriptionBibliography: leaves 98-103.en_ZA
dc.description.abstractThe shaping of SOFAR signals by topographic interference and the depth of the source relative to the axis of the sound channel is investigated. Eight shot signals from five different sites near Cape Town were received at three widely spaced hydrophones at Ascension over a number of 4.4 Megametre lines. These signals show the effects of (1) sources at different depths relative to the axis of the sound channel, (2) blocking and partial blocking of direct rays by seamounts and narrow undersea ridges and (3) a sound speed profile displaced downwards by a filament of warm surface water. Comparisons with ray trace and normal mode models show that some of the received signals consist of a combination of slower, refracted rays and faster rays reflected off Walvis ridge. The reflected energy starts earlier and has a greater amplitude than would be expected from ray trace modelling. This energy will act as noise and make ATOC (Acoustic Thermometry of Ocean Climate) determinations more difficult.en_ZA
dc.identifier.apacitationKrige, L. (2000). <i>SOFAR signal shaping : influence of topography and relative source depth</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/9732en_ZA
dc.identifier.chicagocitationKrige, Leon. <i>"SOFAR signal shaping : influence of topography and relative source depth."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 2000. http://hdl.handle.net/11427/9732en_ZA
dc.identifier.citationKrige, L. 2000. SOFAR signal shaping : influence of topography and relative source depth. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Krige, Leon AB - The shaping of SOFAR signals by topographic interference and the depth of the source relative to the axis of the sound channel is investigated. Eight shot signals from five different sites near Cape Town were received at three widely spaced hydrophones at Ascension over a number of 4.4 Megametre lines. These signals show the effects of (1) sources at different depths relative to the axis of the sound channel, (2) blocking and partial blocking of direct rays by seamounts and narrow undersea ridges and (3) a sound speed profile displaced downwards by a filament of warm surface water. Comparisons with ray trace and normal mode models show that some of the received signals consist of a combination of slower, refracted rays and faster rays reflected off Walvis ridge. The reflected energy starts earlier and has a greater amplitude than would be expected from ray trace modelling. This energy will act as noise and make ATOC (Acoustic Thermometry of Ocean Climate) determinations more difficult. DA - 2000 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2000 T1 - SOFAR signal shaping : influence of topography and relative source depth TI - SOFAR signal shaping : influence of topography and relative source depth UR - http://hdl.handle.net/11427/9732 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/9732
dc.identifier.vancouvercitationKrige L. SOFAR signal shaping : influence of topography and relative source depth. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 2000 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9732en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Oceanographyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherOceanographyen_ZA
dc.titleSOFAR signal shaping : influence of topography and relative source depthen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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