TY - JOUR
TI - The Effect of Wind-Generated Bubbles on Sea-Surface Backscattering at 940 Hz
AU - van Vossen, R
AU - Ainslie, M
T2 - The Journal of the Acoustical Society of America
AB - Reliable predictions of sea-surface backscattering strength are required for sonar performance modeling. These are, however, difficult to obtain as measurements of sea-surface backscattering are not available at small grazing angles relevant to low-frequency active sonar (1-3 kHz). Accurate theoretical predictions of scattering strength require a good understanding of physical mechanisms giving rise to the scattering and the relative importance of these. In this paper, scattering from individual resonant bubbles is introduced as a potential mechanism and a scattering model is derived that incorporates the contribution from these together with that of rough surface scattering. The model results are fitted to Critical Sea Test (CST) measurements at a frequency of 940 Hz, treating the number of large bubbles, parameterized through the spectral slope of the size spectrum for bubbles whose radii exceed 1 mm, as a free parameter. This procedure illustrates that the CST data can be explained by scattering from a small number of large resonant bubbles, indicating that these provide an alternative mechanism to that of scattering from bubble clouds.
DA - 2011/11//
PY - 2011
VL - 130
SP - 3413
EP - 3420
UR - http://scitation.aip.org/content/asa/journal/jasa/130/5/10.1121/1.3626125
DO - 10.1121/1.3626125
LA - English
KW - Noise
ER -