Ship-created underwater noise measurement

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University of Strathclyde researchers have developed a novel way of measuring underwater noise created by ships which poses a danger to marine life.

Human-generated underwater radiated noise (URN) from the military, the oil and gas industry and shipping traffic can interfere with the ability of marine animals to hear, navigate, communicate and catch prey.

The problem was recognised by the United Nations at its Convention of Migratory Species in 2018 where it called for more research on the impact of URN and for countries to mitigate ocean noise where possible.

Professors Patrick Fitzsimmons and Mehmet Atlar of the Department of Naval Architecture, Ocean and Marine Engineering (NAOME), have adapted off-the-shelf equipment to deploy the HyDrone, a waterproof aerial drone fitted with a SoundTrap hydrophone recorder to measure the URN generated by the propulsion systems of marine craft.

The HyDrone is capable of landing on the sea, powering off and floating while the SoundTrap hydrophone is suspended below it. The HyDrone is then flown back to the boat it operates from.

This novel configuration minimises extraneous background noise from tidal current cross-flow which affects traditional weighted-line systems, where a hydrophone is tethered to a buoy or support vessel.

By Jake Frith