Sea Technology

MAR 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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The CTD curve during the bottomsupported measurement in December 2011. site, the AUV will foat on the surface and send the position information to users for recovery. According to the designed measuring modes, the following information during cruising would be acquired: several CTD trapezoid data profles within a depth of 100 meters along the route, with a minimum space interval of the profles (maximum 400) up to 1 kilometer (much higher than the measuring line density of a research vessel), 100 layers of current profles with the maximum range of 200 meters and a depth variation curve within sitioning and pressure modifcation, and send the data via satellite. Upon reaching a preset position underwater, the water chamber will be injected and then sink to the bottom, where GPS positioning will be conducted again. Continuous bottom-supported measurement will begin when the AUV reaches the seabed. At the preset rising time, the load will be released, and the AUV will ascend and make a return voyage. During the return, the platform will make cruising profle measurements along the original route. Upon reaching the recovery 200 meters. In the bottom-supported measurement mode, continuous data at 100 meters depth for 72 hours can be obtained, including about 50 layers of current profles, average depth of water, seabed temperature, conductivity and water level. The variation characteristics of local tides and currents can be analyzed based on the data. Moreover, the water carried in the ballast tank of the AUV could be used as a sample for local water quality analysis. www.sea-technology.com MARCH 2013 / st 25

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