The Journal of the Acoustical Society of America · 2016 · 45 citations · 7 references
Natural SciencesOcean EngineeringOceanographyAcousticsOcean AcousticsUnderwater AcousticsAcoustic MeasurementAcoustic Source ModelingEnvironmental AcousticsUnderwater Sound PropagationBroadband Source ModelingBroadband Underwater NoiseFrequency-dependent PropagationMonopole Source ModelsPropagation Prediction ModelsSea-surface PropagationUnderwater Acoustic ModelingUnderwater Noise Prediction
Underwater sound of rigid-hulled inflatable boats was recorded 142 times in total, over 3 sites: 2 in southern British Columbia, Canada, and 1 off Western Australia. Underwater sound peaked between 70 and 400 Hz, exhibiting strong tones in this frequency range related to engine and propeller rotation. Sound propagation models were applied to compute monopole source levels, with the source assumed 1 m below the sea surface. Broadband source levels (10-48 000 Hz) increased from 134 to 171 dB re 1 μPa @ 1 m with speed from 3 to 16 m/s (10-56 km/h). Source power spectral density percentile levels and 1/3 octave band levels are given for use in predictive modeling of underwater sound of these boats as part of environmental impact assessments.
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