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KIM Hansoo, KANG Donhyug, JUNG Seung Won, KIM Mira. High-frequency acoustic backscattering characteristics for acoustic detection of the red tide species Akashiwo sanguinea and Alexandrium affine[J]. HaiyangYuHuZhao, 2019, 37(4): 1268-1276

High-frequency acoustic backscattering characteristics for acoustic detection of the red tide species Akashiwo sanguinea and Alexandrium affine

KIM Hansoo1,2, KANG Donhyug1, JUNG Seung Won3, KIM Mira1
1 Maritime Security and Safety Research Center, Korea Institute of Ocean Science & Technology (KIOST), Busan 49111, Korea;
2 Department of Ocean System Engineering, Jeju National University, Jeju 63243, Korea;
3 Library of Marine Samples, Korea Institute of Ocean Science & Technology (KIOST), Geoje 53201, Korea
Harmful algal blooms (HABs), caused by the overgrowth of certain phytoplankton species, have negative effects on marine environments and coastal fisheries. In addition to cell-counting methods using phytoplankton nets, a hydroacoustic technique based on acoustic backscattering has been proposed for the detection of phytoplankton blooms. However, little is known of the acoustic properties of HAB species. In this study, as essential data to support this technique, we measured the acoustic properties of two HAB species, Akashiwo sanguinea and Alexandrium affine, which occur in the South Sea off the coast of Korea. Due to the small size of the target, we used ultrasound for the measurements. Experiments were conducted under laboratory and field conditions. In the laboratory experiment, the acoustic signal received from each species was directly proportional to the cell abundance. We derived a relationship between the cell abundance and acoustic signal received for each species. The measured signals were compared to predictions of a fluid sphere scattering model. When A. sanguinea blooms appeared at an abundance greater than 3 500 cells/mL, the acoustic signals varied with cell abundance, showing a good correlation. These results confirm that acoustic measurements can be used to detect HAB species.
Key words:    acoustic backscattering|Akashiwo sanguinea|Alexandrium affine|fluid-sphere scattering model|harmful algal blooms (HABs)|red tide   
Received: 2018-04-30   Revised: 2018-07-19
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