黄海太平洋磷虾回波映像识别与资源密度评估

发布时间：2018-01-11 22:10

本文关键词：黄海太平洋磷虾回波映像识别与资源密度评估　出处：《水产学报》2016年07期 　论文类型：期刊论文

【摘要】：太平洋磷虾是黄海生态系统中浮游动物的关键种。为准确评估太平洋磷虾的资源密度,基于2010年1月黄海渔业资源调查过程中采集的声学和生物学数据,利用SDWBA目标强度理论模型,研究了太平洋磷虾38和120 k Hz目标的回声散射特性,并根据2个频率平均体积散射强度的差值(简称频差技术),开展了太平洋磷虾回波映像识别及资源密度评估研究。结果显示,太平洋磷虾的目标强度与其倾角和体长密切相关;120k Hz的目标强度明显高于38 k Hz,且两个频率的有效平均目标强度之差随着磷虾体长的增加而减小。数据处理结果显示,两个频率回声数据的平均体积散射强度(MVBS)呈线性关系,120 k Hz的MVBS比38 k Hz高约14.1 d B,与理论仿真结果一致;回声散射层内太平洋磷虾的资源密度为1.8~2531.8尾/m3,均值为255.1尾/m3。本研究对利用渔业声学技术开展浮游动物资源评估具有借鉴意义,未来还需要进一步对太平洋磷虾目标强度模型参数及目标识别方法进行完善,以提高其资源密度声学评估的准确度。
[Abstract]:The Pacific krill is the key species of zooplankton in Huang Hai ecosystem. In order to accurately evaluate the resource density of Pacific krill, the acoustic and biological data collected in the fisheries resource survey of Huang Hai in January 2010 were used. The echo scattering characteristics of Pacific krill 38 and 120kHz targets were studied by using the SDWBA target intensity theory model. According to the difference of two frequency mean volume scattering intensity (short for frequency difference technique), the identification of Pacific krill echo image and the evaluation of resource density are carried out. The results show that: 1. The target strength of Pacific krill is closely related to its inclination and body length. The target intensity of 120kHz is significantly higher than that of 38 kHz, and the difference of the effective average target intensity between the two frequencies decreases with the increase of body length. The average volume scattering intensity of the two frequency echo data is linear. The MVBS of 120kHz is about 14.1 dB higher than that of 38kHz. The results are consistent with the theoretical simulation results. The resource density of the Pacific krill in the echo scattering layer is 1.81031.8 / m ~ 3. The mean value is 255.1 tail / m ~ (3). This study can be used for reference in the assessment of zooplankton resources using fishery acoustics technology. In order to improve the accuracy of acoustic assessment of resource density, it is necessary to further improve the parameters of target intensity model and target recognition method of Pacific krill in the future.
【作者单位】：中国水产科学研究院黄海水产研究所农业部海洋渔业资源可持续发展重点实验室山东省渔业资源与生态环境重点实验室;中国海洋大学信息科学与工程学院;
【基金】：国家自然科学基金(40976103)~~
【分类号】：S932.51
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