Acoustic Scattering Models of Zooplankton and Microstructure
نویسندگان
چکیده
The research is a balance of theoretical analysis, numerical simulations, and experimentation in the laboratory and local waters at WHOI. The theories are approximate and have included various ray, volume integration, and modal-series-based solutions. An acoustic pulse-echo laboratory is used to collect backscatter data off of the animals and turbulence over a wide range of acoustic frequencies (24 kHz to 1 MHz) and all angles of orientation (0 to 360 degrees in 1-degree steps). A high performance towed platform (BIOMAPER-II) is used to simultaneously collect acoustic backscatter data (transducers at five frequencies (43 kHz to 1 MHz) looking up and down), video data, and environmental data (temperature, etc.).
منابع مشابه
Sound scattering from oceanic turbulence
[1] The first near coincident measurements of acoustic backscatter and temperature/velocity microstructure confirm theoretical predictions that oceanic turbulence scatters sound. Not only are acoustic backscatter at 307 kHz and turbulent microstructure unambiguously correlated on a patch-by-patch basis, but measured scattering amplitudes agree with theoretical predictions for scattering from tu...
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Acoustic scattering techniques provide a unique and powerful tool to remotely investigate the physical properties of the ocean interior over large spatial and temporal scales. With high-frequency acoustic scattering it is possible to probe physical processes that occur at the microstructure scale, spanning submillimeter to centimeter scale processes. An acoustic scattering model for turbulent o...
متن کاملProceedings of Meetings on Acoustics
Narrowband acoustical backscattering techniques have been used for decades as a tool for remote imaging of smallscale physical processes in energetic coastal environments, such as oceanic internal waves and microstructure, on spatial and temporal scales difficult to probe with in situ measurements. However, to date, it has been challenging to infer quantitative information about turbulent inten...
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A 153 kHz narrowband acoustic Doppler current profiler (ADCP) was used to measure volume backscattering strength (Sv) during a deepwater oceanographic survey of cetacean and seabird habitat in the northeastern Gulf of Mexico. Sv was positively related to zooplankton and micronekton biomass (wet displacement volume) in ‘sea-truth’ net hauls made with a 1m Multiple Opening-Closing Net Environment...
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The long-term goals of this research are to 1) measure and understand high-frequency broadband acoustic scattering in rivers and estuaries characterized by strong temperature and salinity gradients and intermittent, high dissipation rates of turbulent kinetic energy, and 2) use these measurements and understanding to develop a remote sensing tool for quantifying the structure of stratified turb...
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