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首页> 外文期刊>ICES Journal of Marine Science >Estimates of acoustic target strength for giant jellyfish Nemopilema nomurai Kishinouye in the coastal Northwest Pacific
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Estimates of acoustic target strength for giant jellyfish Nemopilema nomurai Kishinouye in the coastal Northwest Pacific

机译：西北太平洋沿岸巨型水母Nemopilema nomurai Kishinouye的声目标强度估算

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摘要

Acoustic target strength (TS) measurements were made of ex situ giant jellyfish Nemopilema nomurai Kishinouye at 38 and 120 kHz. These TS data may be useful for developing acoustic scattering models, and surveying giant jellyfish distributions and biomasses. Each jellyfish was tethered in seawater using a monofilament line that vertically penetrated its bell's centre. During the acoustic measurements, an underwater video camera was used to continuously monitor the jellyfish's behaviour. Acoustic measurements were made using split-beam transducers. TS measurements were made of 27 individual jellyfish, but data were analysed for 23 specimens (bell diameter in air, D_(air) = 21 -65 cm) at 38 kHz, and 19 specimens (D_(air) = 21 -46 cm) at 120 kHz, respectively. Least-squares regression fits of TS vs. log(D_(air)) were TS_(38kHz) = 20·log_(10)D_(air)-82.7 (r = 0.76) and TS_(120kHz) = 20·log_(10)D_(air)-86.7 (r = 0.79). The mean TS values at 38 and 120 kHz, using the average D_(air) = 40.3 cm and 35.5 cm, respectively, were -50.6 and -55.7 dB. The reduced TS, a function of the ratio of D_(air) to wavelength (λ), was RTS(D_(air)/λ) = -6.1 •log_(10)(D_(air)/λ) -36.1 (r = 0.51). These RTS values decreased with increasing D_(air)/λ. Symbiotic medusa shrimp (Latreutes anoplonyx Kemp) contributed negligible bias to our TS measurements of giant jellyfish. These ex situ TS measurements may be used in acoustic surveys to estimate the distributions and biomasses of N. nomurai.
机译：对异位巨型水母Nemopilema nomurai Kishinouye在38 kHz和120 kHz下进行了声学目标强度（TS）测量。这些TS数据对于开发声散射模型以及调查巨型水母分布和生物量可能有用。每条水母通过一条垂直穿过其钟形中心的单丝线束缚在海水中。在进行声学测量时，使用水下摄像机连续监视水母的行为。使用分束式换能器进行声学测量。 TS测量是对27条单独的水母进行的，但分析了38 kHz时的23个样本（钟形直径，空气中的D_（空气）= 21 -65 cm）和19个样本（D_（空气）= 21 -46 cm）的数据分别为120 kHz。 TS与log（D_（air））的最小二乘回归拟合为TS_（38kHz）= 20·log_（10）D_（air）-82.7（r = 0.76）和TS_（120kHz）= 20·log_（10 ）D_（空气）-86.7（r = 0.79）。使用平均D_（空气）= 40.3 cm和35.5 cm分别在38 kHz和120 kHz时的平均TS值是-50.6 dB和-55.7 dB。减少的TS是D_（空气）与波长（λ）之比的函数，为RTS（D_（空气）/λ）= -6.1•log_（10）（D_（空气）/λ）-36.1（r = 0.51）。这些RTS值随着D_（air）/λ的增加而降低。共生美杜莎虾（Latreutes anoplonyx Kemp）对我们对巨型水母的TS的测量偏差可忽略不计。这些异位TS测量可用于声学调查中，以估计野村猪笼草的分布和生物量。

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  • 来源
    《ICES Journal of Marine Science》 |2014年第3期|597-603|共7页
  • 作者

    Donhyug Kang; Jusam Park; Seom-Kyu Jung; Sungho Cho;

  • 作者单位

    Maritime Security Research Center, Korea Institute of Ocean Science and Technology (KIOST), Ansan, PO Box 29, Seoul, 425-600, Republic of Korea;

    Division of Marine Technology, College of Fisheries and Sciences, Chonnam National University, 50 Daehak-ro, Yeosu, Jeonnam, 550-749, Republic of Korea;

    Maritime Security Research Center, Korea Institute of Ocean Science and Technology (KIOST), Ansan, PO Box 29, Seoul, 425-600, Republic of Korea;

    Maritime Security Research Center, Korea Institute of Ocean Science and Technology (KIOST), Ansan, PO Box 29, Seoul, 425-600, Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    giant jellyfish; multifrequency; pulsation; target strength;

    机译：巨型水母多频脉动;目标强度;

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