Performance of an Acoustic Sensing Array in an Energetic Tidal Channel
- Kaustubha Raghukumar (Integral Consulting Inc) | Grace Chang (Integral Consulting Inc) | Frank Wayne Spada (Integral Consulting Inc) | Craig Alexander Jones (Integral Consulting Inc)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 4-7 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2020. Offshore Technology Conference
- 5.3.4 Integration of geomechanics in models, 5 Reservoir Desciption & Dynamics, 5.3 Reservoir Fluid Dynamics
- Passive acoustic monitoring, sound source verification, marine renewable energy, acoustic localization, flow noise
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In support of environmental monitoring technologies to evaluate the acoustic impact of marine energy operations, a cost-effective compact array of acoustic sensors has been developed that characterizes, classifies, and provides accurate location information for anthropogenic and natural sounds in real time. The NoiseSpotter consists of a three-dimensional bottom-mounted array of three acoustic vector sensors cabled to a surface buoy for real-time telemetry. Each sensor measures acoustic pressure and three-dimensional particle velocity associated with the propagation of an acoustic wave.
The NoiseSpotter was deployed in an energetic tidal channel with a tidal oscillation that can approach 3 m. Performance characteristics in the presence of the resulting flow noise is quantified, and a flow noise suppression system is quantitatively shown to significantly improve performance, with flow noise suppression close to 15 dB. Performance is significantly improved when the sensors are housed in a flow noise removal shield, which provides acoustic transparency while reducing non-acoustic signal contamination. Long term durability of this flow-noise suppression shield is demonstrated using biofouling experiments. The real-time telemetry of data digests is demonstrated to allow rapid decision-making in response to measured sound intensity levels.
|File Size||914 KB||Number of Pages||10|
Copping, A.; Sather, N.; Hanna, L.; Whiting, J.; Zydlewski, G.; Staines, G.; Gill, A.; Hutchison, I.; O’Hagan, A.; Simas, T.; Bald, J.; Sparling C.; Wood, J.; Masden, E. 2016. Annex IV 2016 State of the Science Report: Environmental Effects of Marine Renewable Energy Development Around the World.
National Marine Fisheries Service. 2018. 2018 Revisions to: Technical Guidance for Assessing the Effects of Anthropogenic Sound on Marine Mammal Hearing (Version 2.0): Underwater Thresholds for Onset of Permanent and Temporary Threshold Shifts. U.S. Dept. of Commer., NOAA. NOAA Technical Memorandum NMFS-OPR-59, 167 p.