Preliminary Results on Seamount and Continental Slope Reflection Enhancement of Shipping Noise.
SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF MARINE PHYSICAL LAB
Pagination or Media Count:
Measurements of ambient noise levels made during a time period when a supertanker passed the observation site clearly show such vessels to be a strong acoustic source. The tonals associated with the propeller blade rate and its frequency harmonics were clearly observed on single, omni-directional hydrophones for ranges out to 240 nautical miles. The received signals from the radiated noise from this vessel increased in level by as much as 10 dB when it was in the vicinity of a seamount and the continental slope, suggesting a reflection enhancement. The magnitude of this observed reflection enhancement varies inversely with hydrophone depth, being the largest for the shallowest depth. Author