Multibeam sonar observations of near-surface bubbles during a storm
Abstract
In October 2006, a reson SeaBat 7125 multibeam sonar (400 kHz) mounted on the drop keel of the R/V Hugh Sharp was used to collect acoustic backscatter from bubbles generated by breaking wind‐waves in the Gulf of Maine. The multibeam sonar has a very high spatial resolution, with 256 1.0×0.5 deg beams. The data of interest here were collected as the shipreturned to port because of bad weather (sustained 15 m/s wind speed), traveling through the plumes of breaking waves. Data were collected at a ping rate that varied between 5–10 pings/s. These observations show frequent breaking wave bubble plumes extending up to 12 m deep. The data also show that preferential concentrations of bubbles (clusters) were often present.Correlation functions (e.g., the pair correlation) describing the bubble clustering have been extracted from this data, and their affect on acoustic propagation characteristics (sound speed, attenuation) will be presented. [Work supported by ONR Ocean Acoustics.]
Department
Center for Coastal and Ocean Mapping
Publication Date
2007
Volume
122, Issue 5
Journal Title
Journal of the Acoustical Society of America
Pages
2948
Publisher
Acoustical Society of America
Digital Object Identifier (DOI)
10.1121/1.2942502
Document Type
Journal Article
Recommended Citation
T. C. Weber, ‘Multibeam sonar observations of near-surface bubbles during a storm’, The Journal of the Acoustical Society of America, vol. 122, no. 5, p. 2948, 2007.