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VISUALIZATION AND QUANTIFICATION OF MARINE BIOLOGICAL RESOURCES USING BI-PLANE SCANNING SONAR

使用双平面扫描声纳对海洋生物资源进行可视化和量化

基本信息

批准号：
15208017
负责人：
IIDA Kohji
金额：
$ 29.95万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15208017/
关键词：
quantitative sonar 3-D sonar visualization quantification GIS acoustic survey acoustical imaging

项目摘要

The scanning sonar can detect fish school much wider area in the water compared to an echo sounder. The purpose of this study is to develop the new generation quantitative scanning sonar to measure the shape, the volume and the density of the fish school for fisheries survey.1)The quantitative sonar we developed was installed on the fishing boat in Norway and we measured the fish school volume with purse seine fishing for herring and blue whiting. The new sonar was also tested in domestic fishing ground with purse seine fishing for mackerel, squid and yellow tail. Fish schools were detected more than 3,000 meters far from the boat, and the good linear relationship between estimated volume and the catch were found.2)To estimate density of fish school by echo integration method, the target strength in side aspect is necessary. We measured the 3-dimensional target strength of anchovy in sonar frequencies. The target strength in side aspect agreed well to the TS in dorsal aspect, and it showed the "8" figured directional pattern.3)To calculate fish number from the fish school volume, the specific occupation volume by a single fish (Tv) is required. We estimated Tv of walleye pollock dividing the volume backscattering strength (Sv) of fish school by the target strength of fish. Results showed that the Tv is proportional to the 2.6th power of the body length.4)Using the successive multiple sonar images of fish school obtained by the vertical mode, the three dimensional shape of fish school was reconstructed by 3D image processing techniques.5)Results of the study were presented at fisheries and acoustics symposiums. Some of them were applied for domestic and international patents.

与回声测深仪相比，扫描声纳可以探测到水中更大范围的鱼群。本研究的目的是研制新一代定量扫描声纳，用于测量鱼群的形状、体积和密度，为渔业调查提供依据。1）将研制的定量声纳安装在挪威渔船上，对围网捕捞青鱼和鳕鱼的鱼群体积进行了测量。新声纳还在国内渔场进行了试验，用围网捕捞鲭鱼、鱿鱼和黄尾鱼。在距船3,000 m以上的距离上，对鱼群进行了探测，发现鱼群的估计量与渔获量之间存在良好的线性关系。2）利用回波积分法估计鱼群密度时，需要考虑目标在侧面的强度。我们测量了声纳频率下的三维目标强度。侧向目标强度与背向目标强度基本一致，呈“8”字形方向分布。3）由鱼群体积计算鱼群数量时，需要求出单尾鱼的比占有体积（Tv）。我们估算了狭鳕的Tv除以鱼群的体积后向散射强度（Sv）的鱼的目标强度。结果表明，Tv与体长的2.6次方成正比。4）利用垂直模式获得的鱼群连续多幅声纳图像，通过三维图像处理技术重建鱼群的三维形状。5）研究结果在渔业和声学研讨会上发表。其中一些已申请国内和国际专利。