|Title||Underwater radiated noise levels of a research icebreaker in the central Arctic Ocean|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Roth EH, Schmidt V, Hildebrand JA, Wiggins SM|
|Journal||Journal of the Acoustical Society of America|
|Type of Article||Article|
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 10 dB between 20 Hz and 2 kHz 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 100 Hz, source levels reached 190-200 dB re: 1 mu Pa at 1m (full octave band) during ice-breaking operations. (C) 2013 Acoustical Society of America.