Comparison of the underwater ambient noise measured in three large exhibits at the Monterey Bay Aquarium and in the inner Monterey Bay
O'Neal, Daniel Matthew
Baker, Steven R.
Muir, Thomas G.
MetadataShow full item record
Ambient underwater acoustic-noise recordings were made in three large exhibits at the Monterey Bay Aquarium and the inner Monterey Bay, with the results reported here. Observed broadband (0-6.4 kHz) acoustic noise levels ranged from 112-125 dB re 1 microPa for the aquarium exhibits under normal operating conditions. Broadband acoustic noise levels of 113 dB and 116 dB re 1 microPa were observed for the nearshore and offshore bay locations, respectively. A comparison of the noise spectrum in the aquarium's largest exhibit to that of the environment which it attempts to simulate, the offshore bay, revealed a higher noise level of approximately 15-25 dB in the exhibit for frequencies between 20 Hz and 6.4 kHz. A similar comparison of the noise spectra of the two smaller exhibits and the nearshore bay location revealed a difference of approximately 5-10 dB across the entire frequency range of 0-6.4 kHz. Aquarium measurements with various mechanical equipment (motors, fans, pumps, sprinklers, wave machine) turned on and off highlighted some of the prominent ambient noise contributors. It was concluded that the pump machinery is the greatest contributor to ambient noise, with the strength directly related to the exhibits' proximity to the machinery room
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Baxa, Philip S. (Monterey, California: Naval Postgraduate School, 2014-12);The Monterey Bay Aquarium was founded in 1984 and hosts nearly two million visitors each year. In addition to the paid staff, there are over 1,000 volunteers who are critical to Aquarium operations. One set of volunteers ...
Morvillez, Thierry (Monterey, California. Naval Postgraduate School, 1997-09);The electronic emissions of a low frequency sound source placed by the Acoustic Thermometry of Ocean Climate (ATOC) project on Pioneer Seamount were monitored by a bottom lying receiver on Sur Ridge from April 1996 to ...
Krioneritis, Nickolaos G. (Monterey, California. Naval Postgraduate School, 1989-12);The purpose of this thesis was to evaluate the accuracy of the existing Mini-Ranger network in Monterey Bay and to suggest means by which the network can be improved. This network consists of six stations located around ...