Underwater radiated noise levels of a research icebreaker in the central Arctic Ocean
|Title||Underwater radiated noise levels of a research icebreaker in the central Arctic Ocean|
|Publication Type||Journal Abstract|
|Authors||Roth, Ethan H., Schmidt, Val E., Hildebrand, John A., and Wiggins, Sean M.|
|Journal||The Journal of the Acoustical Society of America|
|Keywords||acoustic noise, sea ice, ships, underwater sound|
U.S. Coast Guard Cutter Healy's underwater radiated noise signature was characterized in the central Arctic Ocean during different types of ice-breaking operations. Propulsion modes included transit in variable ice cover, breaking heavy ice with backing-and-ramming maneuvers, and dynamic positioning with the bow thruster in operation. Compared to open-water transit, Healy's noise signature increased approximately 10dB between 20Hz and 2Hz when breaking ice. The highest noise levels resulted while the ship was engaged in backing-and-ramming maneuvers, owing to cavitation when operating the propellers astern or in opposing directions. In frequency bands centered near 10, 50, and 100Hz, source levels reached 190-200dB re: 1 μPa at 1 m (full octave band) during ice-breaking operations.
|URL to Journal||http://link.aip.org/link/?JAS/133/1971/1|