A New Sonar: Cabled Observatory Vent Imaging Sonar (COVIS)
Karen Bemis, Russ Light, Guangyu Xu, Darrell Jackson, Vern Miller, Anatoliy Ivakin (and Peter Rona)
COVIS is an innovative imaging sonar platform designed specifically to quantitatively monitor seafloor hydrothermal plumes. Three mechanical motors control the Reson 7180 sonars orientation enabling COVIS to acquire acoustic backscatter in three different modes every 3 hours. Imaging and Doppler modes (400 kHz) collect 3D backscatter to image the plume and estimate bending patterns, flow rates, and heat and volume fluxes. The Diffuse mode (200 kHz) detects diffuse discharge for 2-D mapping. A near-continuous four-year record of plume and diffuse discharge at Grotto in the Main Endeavour Field on the Juan de Fuca Ridge was acquired during COVISs deployment on the Ocean Network Canadas NEPTUNE Observatory. Recent advances have enabled quantitative estimation of plume fluxes and have promise to enable quantitative mapping of temperature variance in diffuse discharge.
COVIS TEAM: Karen Bemis, Russ Light, Guangyu Xu, Darrell Jackson, Vern Miller, Anatoliy Ivakin (and Peter Rona)