SOFAR signal shaping : influence of topography and relative source depth

 

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dc.contributor.advisor Brundrit, Geoff en_ZA
dc.contributor.author Krige, Leon en_ZA
dc.date.accessioned 2014-11-19T06:47:46Z
dc.date.available 2014-11-19T06:47:46Z
dc.date.issued 2000 en_ZA
dc.identifier.citation Krige, L. 2000. SOFAR signal shaping : influence of topography and relative source depth. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/9732
dc.description Bibliography: leaves 98-103. en_ZA
dc.description.abstract 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. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Oceanography en_ZA
dc.title SOFAR signal shaping : influence of topography and relative source depth en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Oceanography en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Krige, 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/11427/9732 en_ZA
dc.identifier.chicagocitation Krige, 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/11427/9732 en_ZA
dc.identifier.vancouvercitation Krige 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/11427/9732 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


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