极地研究

极地研究 ›› 2014, Vol. 26 ›› Issue (4): 451-459.DOI: 10.13679/j.jdyj.2014.4.451

• 研究论文 • 上一篇    下一篇

南极大磷虾声学调查数据噪声处理与资源评估

屈泰春1,2 陈帅1 黄洪亮1 汤勇2 刘健1 吴越1 李灵智1 冯春雷1 戴阳3   

  1.  
    1中国水产科学研究院东海水产研究所, 农业部东海与远洋渔业资源开发利用重点实验室, 上海 200090;
    2大连海洋大学，海洋科技与环境学院, 辽宁, 大连 116023;
    3中国水产科学研究院东海水产研究所, 渔业遥感信息技术实验室, 上海 200090
  • 收稿日期:2013-06-03 修回日期:2013-10-22 出版日期:2014-12-30 发布日期:2014-12-30
  • 通讯作者: 黄洪亮
  • 基金资助:

    南北极环境综合考察专项（CHINARE 2013-01-06，CHINARE2013-04-02-04），公益性行业（农业）科研专项（201203018），南极海洋生物资源开发利用专项（2010-2013）资助

REMOVE OF ECHO INTEGRATION NOISE AND ESTIMATE OF THE ABUNDANCE OF ANTARCTIC KRILL

Qu Taichun1,2, Chen Shuai1, Huang Hongliang1, Tang Yong2, Liu Jian1, Wu Yue1, Li Lingzhi1, Feng Chunlei1, Dai Yang3   

  1.  
    1East China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences, Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation, Ministry of Agriculture, Shanghai 200090, China;
    2Dalian Ocean University, School of Marine Science and Environment Engineering, Liaoning, Dalian 116023, China
    3East China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences, Key Laboratory of fisheries remote sensing & information technology, Shanghai 200090, China
  • Received:2013-06-03 Revised:2013-10-22 Online:2014-12-30 Published:2014-12-30

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摘要： 在中国第28次南极科学考察期间，利用“雪龙号”科考船载SIMRAD EK500（38kHz）科学渔探仪对南极半岛附近海域的南极大磷虾资源量进行了调查。原始声学数据经过信噪比估算和背景噪声剔除数据后处理方法剔除背景噪声以及手动剔除表面混响、海底反射和坏数据之后，在200 m以浅水层中，以1n mile间隔进行积分，并应用Matlab软件编程对积分结果进行后处理，得出调查海域中南极大磷虾的资源分布情况。结果表明：（1）“雪龙号”的平均噪声功率值为-146.47dB re 1W ；(2)空白水体的噪声平均剔除百分比为88.3%；（3）调查区域内的南极大磷虾平均密度为27.30 g·m-2（62.95 ind·m-2）。

关键词: 南极大磷虾, 声学评估, 噪声, 信噪比

Abstract: The abundance of krill on the continental shelf and slope north of the Antarctic Peninsula was measured during the 28th Chinese Antarctic Research Expedition in the summer of 2011–2012. Acoustic data for the estimation of krill abundance were collected using an EK500 scientific echo sounder installed on the R/V Xuelong, using a 38 kHz operating frequency. However, the data were affected by significant electrical noise that had to be removed before integrating the mean volume backscattering strength (Sv). Noise correction and signal-to-noise-based thresholds were used for post-processing removal of noise from the acoustic data. Cell-size parameters of one ping and 70 samples were used to average the power data, a quantity equivalent to the Sv with no time varied gain applied. The signal-to-noise ratio (SNR) was defined as the original Sv minus the estimated maximal Svnoise, such that 0 dB could be set as the minimum desired SNR. The results showed that the noise power averaged over all transects was −146.47 dB re 1W and the average noise-removal percentage reached 88.3%. The mean biomass and numerical density in the survey area were 27.30 g·m−2 and 2.95 ind·m−2,respectively. This study demonstrates that the R/V Xuelong is a useful platform to study the biomass and distribution of krill using acoustic methods.

Key words: Antarctic krill, acoustic estimation, noise, signal-to-noise ratio