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Ambient noise measurements in the northwest Indian Ocean

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2 Author(s)
Wagstaff, R.A. ; Naval Ocean Syst. Center, San Diego, CA, USA ; Aitkenhead, J.W.

Ambient noise measurements were made at seven different locations during the first four months of 1977. The measurement systems included: two types of towed arrays, a bottomed array, and systems with sensors distributed throughout the water column. The noise in the frequency regime dominated by shipping was found to be extremely high with a spectrum level of 92 dB//1 μPa at 50 Hz. These high levels were attributed to the high-density shipping. Horizontal directionality of the noise varied from site to site, ranging from highly directional to nearly nondirectional. The character of the directionality was highly dependent on the site position relative to shipping lanes. The noise showed very little dependence on depth.

Published in:

Oceanic Engineering, IEEE Journal of  (Volume:30 ,  Issue: 2 )

Date of Publication:

April 2005

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