Underwater radiated noise levels of a research icebreaker in the central Arctic Ocean

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 positi...

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Bibliographic Details
Main Authors: Roth, Ethan H, Schmidt, Val E., Hildebrand, John A, Wiggins, Sean M
Format: Text
Language:unknown
Published: University of New Hampshire Scholars' Repository 2013
Subjects:
acoustic noise
sea ice
ships
underwater sound
Oceanography and Atmospheric Sciences and Meteorology
Arctic
Arctic Ocean
Icebreaker
Sea ice
Online Access:https://scholars.unh.edu/ccom/879
https://scholars.unh.edu/cgi/viewcontent.cgi?article=1879&context=ccom
Description
Summary: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 μPa at 1 m (full octave band) during ice-breaking operations.

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