The towfish will record data at different sound frequencies, depending on the survey goals: a lower frequency (50 kilohertz (kHz) -100 kHz) can cover large swathes of the seafloor at low image resolution. Side scans search at constant speeds and in straight lines, allowing the ship to map the ocean bottom as it travels. How does it work?Īs the ship moves along its path, the transducer array sends out signals on both of its sides, sweeping the seafloor like the fan-shaped beam of a flashlight. Image courtesy of the Michigan Technological University Great Lakes Research Center. Image Source: Michigan Technological University Great Lakes Research Center. The sonar image shows the bow and upright foremast, cargo hatches across Typo’s deck, and the broken stern with a pile of spilled coal. The schooner, which was carrying a cargo of coal, was rammed in the stern. Side scan sonar image of schooner Typo, which collided with steamer W.P.
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