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Multibeam sonar observations of hydrothermal flows at the Main Endeavour Field.
J. Acoust. Soc. Am. Volume 129, Issue 4, pp. 2373-2373 (2011); (1 page)
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Add to FacebookThe Cabled Observatory Vent Imaging Sonar has been deployed at the Main Endeavour Node of the Canadian Neptune cabled observatory and has acquired data on plume and diffuse hydrothermal flows. Based on the Reson 7125 multibeam sonar and operating at 200 and 400 kHz, two‐dimensional and three‐dimensional time series are produced using plume backscattering, Doppler shift, and acoustic scintillation. Hydrothermal plumes and diffuse flow are important as agents of transfer of heat, chemicals, and biological material from the mantle and crust into the ocean in quantitatively significant amounts. High‐frequency sonar measurements offer the possibility of inversion to obtain fluxes of central importance in these processes. Long‐term time series, obtainable in cabled systems, allow observations of hydrothermal response to tidal, tectonic, and volcanic forcing. Examples will be given of plume bending due to currents, determination of entrainment of ambient water, time variation of diffuse flows, and Doppler determination of volume flux. [Work supported by NSF Grants Nos. OCE‐0824612 and OCE‐0825088.]
© 2011 Acoustical Society of America
PACS
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Ocean parameter estimation by acoustical methods; remote sensing; imaging, inversion, acoustic tomography
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