Surf zone bubble spectrometry: The role of the acoustic cross section (Plenary Address given at the Inaugural Award of the Medwin Prize for Acoustical Oceanography)
Leighton, T.G. (2001) Surf zone bubble spectrometry: The role of the acoustic cross section (Plenary Address given at the Inaugural Award of the Medwin Prize for Acoustical Oceanography). Journal of the Acoustical Society of America, 110, (5), p.2694.
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Fifty years ago, there were doubts as to whether microbubbles existed in the sea at all. Herman Medwin settled the issue in the 1960s by showing that they were indeed present, and in very large numbers. He interpreted in situ measurements of backscatter and attenuation using the concept of the acoustic cross section. In essence that procedure forms the basis of the most popular ways of measuring microbubbles today, the two favored experimental layouts (measurement of attenuation and sound speed along a propagation path, and the acoustical resonator) being based on techniques pioneered by Medwin. In recent years attempts have been made to take these open ocean techniques and deploy them in the surf zone. Here the assumptions inherent in the standard form of the cross section can be violated. Specifically, the conditions may not relate to plane wave insonification of isolated bubbles undergoing steady state single-frequency linear pulsations in the free field in an incompressible liquid. This paper describes the attempts that have been made to produce cross sections which are not restricted by these limitations, and how these are exploited in determining the evolution, anatomy, and effects of bubble clouds. [The support of The Royal Society Leverhulme Trust is acknowledged.]
|Subjects:||Q Science > QC Physics|
|Divisions:||University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Fluid Dynamics and Acoustics
|Date Deposited:||26 May 2006|
|Last Modified:||02 Mar 2012 13:46|
|Contributors:||Leighton, T.G. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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