A COMPARISON OF DEEP AND SHALLOW WATER AMBIENT NOISE MEASUREMENTS AT SELECTED SITES OFF WESTERN VANCOUVER ISLAND USING A MULTI-ELEMENT VERTICAL ARRAY

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Authors
  1. Scrimger, P.
  2. Scrimger, P.
  3. Fahmi, M.N.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);JASCO Research Ltd, Sidney BC (CAN)
Abstract
The paper describes ambient noise data recorded at several locations on and near the continental shelf off the west coast of Vancouver Island. The data were obtained in both shallow and deep-water with the Multi Element Vertical Array (MEVA) at various locations during a three year period. These data had not been examined to date; however, given the increased interest in shallow-water acoustic environments, it was considered timely to perform a detailed analysis of the available data. Four sites are examined, two located in deep water (2500-2600 m) just off the continental shelf, and two located in shallow water (400-500 m) on the continental shelf. One deep water site was monitored more or less continually over a four day period, and the data provide a good measure of the temporal variation present in the ambient noise. The analysis includes estimates of the omnidirectional noise level at the four sites as a function of both frequency and water depth (the depth dependency is obtained by examining a time series of the acoustic data recorded for selected individual hydrophones in the MEVA array). Directional estimates of the ambient noise field are also presented. The directional estimates are obtained by beamforming the recorded data over a selected time period and displaying the results in the form of coloured frequency-vs. -evaluation angle surfaces.
Report Number
DREP-CR-94-52 — Contractor Report
Date of publication
01 Mar 1994
Number of Pages
35
DSTKIM No
94-02299
CANDIS No
141332
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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