Flow-noise resulting from oceanic turbulence and interactions with pressure-sensitive transducers can interfere with ambient noise measurements. This noise source is particularly important in low-frequency measurements (f < 100 Hz) and in highly turbulent environments such as tidal channels. This work presents measurements made in the Chacao Channel, Chile, and in Admiralty Inlet, Puget Sound, WA. In both environments, peak currents exceed 3 m/s and pressure spectral densities attributed to flow-noise are observed at frequencies up to 500 Hz. At 20 Hz, flow-noise exceeds mean slack noise levels by more than 50 dB. Two semi-empirical flow-noise models are developed and applied to predict flow-noise at frequencies from 20 to 500 Hz using measurements of current velocity and turbulence. The first model directly applies mean velocity and turbulence spectra while the second model relies on scaling arguments that relate turbulent dissipation to the mean velocity. Both models, based on prior formulations for infrasonic (f < 20 Hz) flow-noise, agree well with observations in Chacao Channel. In Admiralty Inlet, good agreement is shown only with the model that applies mean velocity and turbulence spectra, as the measured turbulence violates the scaling assumption in the second model.
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April 2014
April 01 2014
Flow-noise and turbulence in two tidal channels
Christopher Bassett;
Department of Mechanical Engineering, University of Washington
, Seattle, Stevens Way, Box 352600, Seattle, Washington 98165
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Jim Thomson;
Jim Thomson
Applied Physics Laboratory, University of Washington
, Seattle, 1013 NE 40th Street, Box 355640, Seattle, Washington 98105-6698
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Peter H. Dahl;
Peter H. Dahl
Applied Physics Laboratory, University of Washington
, Seattle, 1013 NE 40th Street, Box 355640, Seattle, Washington 98105-6698
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Brian Polagye
Brian Polagye
Department of Mechanical Engineering, University of Washington
, Seattle, Stevens Way, Box 352600, Seattle, Washington 98165
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a)
Author to whom correspondence should be addressed. Current address: Woods Hole Oceanographic Institution, Department of Applied Ocean Physics and Engineering, Woods Hole, MA 02543. Electronic mail: [email protected]
J. Acoust. Soc. Am. 135, 1764–1774 (2014)
Article history
Received:
August 02 2013
Accepted:
February 10 2014
Citation
Christopher Bassett, Jim Thomson, Peter H. Dahl, Brian Polagye; Flow-noise and turbulence in two tidal channels. J. Acoust. Soc. Am. 1 April 2014; 135 (4): 1764–1774. https://doi.org/10.1121/1.4867360
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