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Proceedings Paper

Infrared imaging of surface waves interaction with a submerged object
Author(s): Ivan B. Savelyev; Geoffrey B. Smith
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Paper Abstract

The goal of this study is to investigate thermal signatures left at the water surface by waves interacting with a submerged sphere. Two possible mechanisms for the appearance of detectable signatures are identified: 1) turbulence generated by the interaction of the wave's orbital motions and the sphere propagates away from the sphere and disturbs a pre-existing thermal gradient, and 2) the sphere is sufficiently close to the water surface to cause shoaling waves, which break and disturb the thermal gradient. In both cases if the existing thermal gradient and the turbulence intensity are 'strong enough' a detectable thermal signature will be left. In this laboratory study a high-resolution infrared camera was used to observe these temperature fluctuations for a variety of cases. Spheres of 3 different diameters were rigidly mounted at different depths and subjected to mechanically generated waves of varying amplitude. A set of critical conditions for the appearance of detectable signatures is identified and possible scalings are discussed.

Paper Details

Date Published: 4 May 2011
PDF: 7 pages
Proc. SPIE 8030, Ocean Sensing and Monitoring III, 803007 (4 May 2011); doi: 10.1117/12.886925
Show Author Affiliations
Ivan B. Savelyev, U.S. Naval Research Lab. (United States)
Geoffrey B. Smith, U.S. Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 8030:
Ocean Sensing and Monitoring III
Weilin W. Hou; Robert Arnone, Editor(s)

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