Estimation of sea surface wave spectra using acoustic tomography
Miller, James H.
MetadataShow full item record
This 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.
Submitted 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 1987
Suggested CitationThesis: Miller, James H., "Estimation of sea surface wave spectra using acoustic tomography", 1987-08, DOI:10.1575/1912/3944, https://hdl.handle.net/1912/3944
Showing items related by title, author, creator and subject.
Oceanic lithosphere magnetization : marine magnetic investigations of crustal accretion and tectonic processes in mid-ocean ridge environments Williams, Clare M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-09)The origin of symmetric alternating magnetic polarity stripes on the seafloor is investigated in two marine environments; along the ridge axis of the fast spreading East Pacific Rise (EPR) (9º 25’-9º 55’N) and at Kane ...
Studies of the waters on the continental shelf, Cape Cod to Chesapeake Bay. I. The cycle of temperature Bigelow, Henry Bryant (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1933-12)When the U. S. Bureau of Fisheries, in cooperation with the Museum of Comparative Zoology, commenced the oceanographic survey of the Gulf of Maine in the summer of 1912 (Bigelow, 1925-1927), it was in the hope that this ...
Cytochrome P450 1A1 and aromatase (CYP19) in cetaceans : enzyme expression and relationship to contaminant exposure Wilson, Joanna Y. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)Contamnant exposure has been associated with toxic effects in marine mammals. Studies on early biochemical and molecular responses prior to, but associated with, contaminant-induced toxicity will aid in understanding the ...