Shallow-water tracking in the sea of Nazaré

Document Type

Conference Proceeding

Publication Date

1-1-1998

Abstract

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 echo-pattern 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.

Identifier

84964836182 (Scopus)

ISBN

[0780342739, 9780780342736]

Publication Title

Ut 1998 Proceedings of the 1998 International Symposium on Underwater Technology

External Full Text Location

https://doi.org/10.1109/UT.1998.670053

First Page

29

Last Page

34

Grant

N00014-95-0558

Fund Ref

Office of Naval Research

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