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Advisor(s)
Abstract(s)
In the summer of 1996, an experiment was conducted off the coast of Portugal to study the effects of internal tides on sound propagation. This experiment—called INTIMATE '96 (Internal Tide Investigation by
Means of Acoustic Tomography Experiment)—has provided a great deal of insight about the variability of pulse transmission over space and time. In contrast to a common view of shallow-water propagation as complicated and
unpredictable, we find a steady pattern of echoes. The echo-pattern stretches and shrinks in a systematic way with the tides and allows us to infer the components of the first few oceanographic modes. We also used the echopattern to track the source over a period of several days. During this period the isotherms in the ocean wavered by 20 m as a result of the tides, providing a challenge for model-based tracking. We will discuss these acoustic results with emphasis on the source tracking.
Description
Keywords
Tomography Underwater sound Matched-field processing Oceanographic regions Acoustic tomography Acoustic wave propagation Tides
Citation
M.B. PORTER, Y. STEPHAN, X. DEMOULIN, S.M. JESUS and E.F. COELHO, ``Shallow-water tracking in the sea Nazaré'' in Underwater Technology'98, IEEE Ocean Engineering Society, Tokyo, Japan, pp. 29-34, (doi:10.1109/UT.1998.670053).
Publisher
IEEE