THE RESEARCH PROBLEM:

Acoustic backscattering from bubbly mixtures induced by wavebreaking and ship wakes, as well as forward propagation in shallow water waveguides after wavebreaking, show strong effects due to the presence of bubbles suspended in the water column. To first order, these effects manifest themselves as significant, frequency-dependent variations in sonic velocity and attenuation [Wille et al., 1987; Turner, 1976]. The character of sonic velocity dispersion in clean suspensions of bubbles is well understood. However the attenuation of sound in such bubbly mixtures is not, particularly at and slightly above the bubble resonance frequency [Commander and Prosperetti, 1989]. Moreover, when considering small bubbles stabilized by layers of dendritic material are not well understood, this deficiency is broadband; it applies to frequencies below, near and above the bubble resonance region [Macintyre, 1986; Glazman, 1983].

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REFERENCES:

Commander, K. and Prosperetti, A. (1989) J. Acoust. Soc. Am. 85, 732-746.

Glazman, R.E. (1983) J. Acoust. Soc. Am. 74, 980-986.

Macintyre, F. (1986) in "Oceanic Whitecaps," E.C. Monahan & G. MacNiocaill eds., D. Reidel, 75-94.

Turner, W.R. (1976) J. Acoust. Soc. Am. 60, 1300-1308.

Wille, P.; Geyer, D.; Ginzkey, L.; and Schunk, E. (1987) in "Progress in Underwater Acoustics," H. Merklinger, ed., Plenum Press, New York, 501-508.

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Last Updated March 13, 2002