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Article title MONITORING OF UNDERWATER NOISE NEAR VLADIVOSTOK OCEANARIUM
Authors S.V. Gorovoy, A.V. Kiryanov, E.M. Jeldak
Section SECTION I. ACOUSTICS AND HYDROACOUSTICS
Month, Year 12, 2015 @en
Index UDC 534–143
DOI
Abstract The paper describes the results of the study of spectral and cross-spectral characteristics of underwater noise in the frequency range of 30–4000 Hz, registered in the area east of Vladivostok oceanarium located on Russkiy island. The depth in the study area is 20–30 meters; the bottom is sand and stones; and the distance to the shore is 1 nautical mile. This area is characterized by intense traffic. The average time interval between vessels at distances of up to 3 miles from the study area does not exceed two hours. The distance to the nearest anchored vessel was about 3 miles. A receiving system consisting of two vertically spaced omnidirectional hydrophones attached to the drifting buoy was used for receiving underwater noise signals. The signals received by hydrophones were transmitted by cable to a light boat drifting along the buoy. The results of the study of temporal variability of spectral and cross-spectral characteristics of noise in the water area, including the noise from passing vessels near the receiving system, are presented. During the measurement the averaged spectral level at 1 kHz frequency in 1 Hz band was 70–80 dB relative to 1 µPa. The temporal changes of phase relations between the components of cross–spectrum for the vertically spaced hydrophones were registered, including changes in the absence of moving vessels in the line of sight from the boat. At time intervals from a few to tens of seconds, they varied from “complete incoherence” to “complete coherence” in the frequency range from 300 Hz to 4 kHz. These changes can be represented as changes in the intensity distribution of the underwater noise in the vertical plane with time.

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Keywords Environmental monitoring; underwater noise; spectral analysis; coherence function; processing of underwater noise signals; noise signal phase fluctuations.
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