基于基尔霍夫射线模型法的高白鲑目标强度研究

doi:10.16535/j.cnki.dlhyxb.2020-082

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大连海洋大学学报 ›› 2021, Vol. 36 ›› Issue (2) : 310-316. DOI: 10.16535/j.cnki.dlhyxb.2020-082

孙扬1，汤勇1*，邢彬彬1，李泓泉1，毕福洋2，马壮2

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Target strength of northern whitefish Coregonus peled by using Kirchhoff ray mode methods

SUN Yang1, TANG Yong1*, XING Binbin1, LI Hongquan1, BI Fuyang2, MA Zhuang2

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摘要

为了实现用目标强度对新疆维吾尔自治区赛里木湖高白鲑Coregonus peled的资源量进行评估，于2017年6月和2018年7月从赛里木湖全湖水域的定置网中共采集19尾高白鲑作为样本，使用基尔霍夫射线模型在常用渔业声学调查频率70、120、200 kHz下进行了高白鲑目标强度的测定，并根据姿态倾角概率密度分布，建立了不同频率下高白鲑目标强度与体长、体长平方的拟合方程。结果表明：高白鲑目标强度姿态倾角的指向性图案与一般有鳔鱼类具有相似的频率特征，即在较低频段主瓣明显且旁瓣较少，高频段主瓣不明显且旁瓣较多；目标强度最大值出现在姿态倾角为-3°～-5°之间，与鱼鳔与鱼体之间夹角(平均值2.8°)基本吻合；在高白鲑姿态倾角高斯概率密度函数为正态分布(-5°±10°)时，70、120、200 kHz 3种频率下高白鲑平均目标强度与体长的拟合方程分别为TS=16.4 lgL-59.2、TS=21.3 lgL-64.3和TS=23.7 lgL-65.3，与体长平方(即体长平方的常用对数值)的拟合方程分别为TS=20 lgL-63.6、TS= 20 lg L-62.6和TS=20 lgL-60.7。研究表明，高白鲑的平均目标强度比一般单室闭鳔鱼类大3～5 dB，且随频率的增加而增大，与以往其他白鲑属鱼类目标强度的研究结果具有相似性。

Abstract

In order to use the target strength to evaluate the stock of northern whitefish Coregonus peled in Sayram Lake, Xinjiang Uygur Autonomous Region, the target strength was determined in 19 individuals sampled from traps from June 2017 to July 2018 using Kirchhoff ray mode methods with the attitude inclination at the commonly used fishery acoustic survey frequencies of 70, 120, and 200 kHz, and then the fitting equations were established at different frequencies corresponding to the northern whitefish according to the directivity pattern and the probability density distribution of the attitude inclination, to establish empirical formula of target strength with body length and body length squared. The results showed that the northern whitefish had similar frequency characteristics to that of general swim bladder fish in directivity pattern of target attitude inclination, that is, the main lobe was obvious in the lower frequency band and the side lobes were less, without the obvious main lobe in the high frequency band and with the relatively large side lobes. The maximum target strength was observed at the attitude inclination angle from -3° to -5°, basically consistent with the angle between the swim bladder and the fish body (average value 2.8°). Assuming that the attitude of the northern whitefish was -5°±10° under the condition of 10° Gaussian distribution, the relationship between average target strength and body length corresponding to the three frequencies was expressed as fitting equation TS=16.4 lgL-59.2 at 70 kHz, TS=21.3 lgL-64.3 at 120 kHz and TS=23.7 lgL-65.3 at 200 kHz. The relationship between the average target strength and the square of the body length(which is the common logarithmic value of body length squared) was described as fitting equation TS=20 lgL-63.6 at 70 kHz, TS=20 lgL-62.6 at 120 kHz and TS=20 lgL-60.7 at 200 kHz. The findings indicated that there was 3-5 dB larger average target strength, elevated with the increase in frequency, in the northern whitefish than that in conventional single-chamber swim bladder fish, which is similar to the previous research results of target strength in other whitefish Coregonus.

导出引用

孙扬, 汤勇, 邢彬彬, 李泓泉, 毕福洋, 马壮. 基于基尔霍夫射线模型法的高白鲑目标强度研究[J]. 大连海洋大学学报, 2021, 36(2): 310-316 https://doi.org/10.16535/j.cnki.dlhyxb.2020-082

SUN Yang, TANG Yong, XING Binbin, LI Hongquan, BI Fuyang, MA Zhuang. Target strength of northern whitefish Coregonus peled by using Kirchhoff ray mode methods[J]. Journal of Dalian Fisheries University, 2021, 36(2): 310-316 https://doi.org/10.16535/j.cnki.dlhyxb.2020-082

中图分类号： S 932