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dc.contributor.authorMiller, James H.
dc.date.accessioned2010-10-13T20:08:29Z
dc.date.available2010-10-13T20:08:29Z
dc.date.issued1987-08
dc.identifier.urihttp://hdl.handle.net/1912/3944
dc.descriptionSubmitted in partial fulfillment of the requirements for the degree of Doctor of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution August 1987en_US
dc.description.abstractThis thesis develops a new technique for estimating quasi-homogeneous and quasi-stationary sea surface wave frequency-direction spectra using acoustic tomography. The analysis of acoustic (mode and ray) phase and travel time perturbations due to a rough sea surface is presented. Two canonical waveguides (ideal shallow water and linear squared index of refraction) are used as examples for the mode perturbation. The analysis is used to explain high mode coherence measured in the FRAM N experiment. The forward problem of computing the acoustic phase and travel time perturbation spectra given the surface wave spectrum is solved to first order. An application of the technique to ray phase data taken during the MIZEX '84 experiment is shown. The inverse problems for the homogeneous and quasi-homogel1eous frequency-direction spectrum are introduced. The theory is applied to synthetic data which simulate a fetch-dependent sea. The estimates made agree well with the "actual" (synthetic data) spectrum. The effect of noise in the travel time estimates is studied. The sensitivity of the technique. to the number of rays used in the inversion is investigated and the resolution and variance of the inverse method are addressed.en_US
dc.description.sponsorshipgratefully acknowledge the financial support of the Office of Naval Research, the General Electric Foundation, and the Ford Foundation.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherMassachusetts Institute of Technology and Woods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Thesesen_US
dc.subjectOcean wavesen_US
dc.titleEstimation of sea surface wave spectra using acoustic tomographyen_US
dc.typeThesisen_US
dc.identifier.doi10.1575/1912/3944


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