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Multifrequency acoustic scattering characteristics of jack mackerel by KRM model

KRM 모델을 이용한 전갱이의 다주파수 음향산란특성

  • HWANG, Kangseok (Fisheries Resource Research Division, Nataional Fisheries Research & Development Institute) ;
  • YOON, Eun-A (Division of Marine Technology, Chonnam National University) ;
  • LEE, Kyounghoon (Division of Marine Technology, Chonnam National University) ;
  • LEE, Hyungbeen (Fisheries Resource Research Division, Nataional Fisheries Research & Development Institute) ;
  • HWANG, Doo-Jin (Division of Marine Technology, Chonnam National University)
  • 황강석 (국립수산과학원 자원관리과) ;
  • 윤은아 (전남대학교 해양기술학부) ;
  • 이경훈 (전남대학교 해양기술학부) ;
  • 이형빈 (국립수산과학원 자원관리과) ;
  • 황두진 (전남대학교 해양기술학부)
  • Received : 2015.08.03
  • Accepted : 2015.08.22
  • Published : 2015.08.31

Abstract

This study was focused on acoustic scattering characteristics of jack mackerel (Trachurus japonicus) at frequency 38, 70, and 120 kHz by Kirchhoff-ray mode (KRM) model. The body length (BL) of 16 individuals ranged in 12.2~22.0 cm ($mean{\pm}S.D.$: $17.8{\pm}3.2cm$) and the swimbladder length ranged in 4.2~8.6 cm ($mean{\pm}S.D.$: $6.6{\pm}1.6cm$) and the swimbladder cross section ranged in $1.7{\sim}6.6cm^2$ ($mean{\pm}S.D.$: $3.8{\pm}1.6cm^2$). This result shows that results correlate well between the BL and the length and cross section of swimbladder. The swimbladder angle ranged in $7{\sim}12^{\circ}$ and the maximum TS values ranged in $-16{\sim}-5^{\circ}$ at tilt angle. The averaged TS-to-BL relationship were $TS_{38kHz}=20{\log}_{10}BL-65.33$ ($R^2=0.66$), $TS_{70kHz}=20{\log}_{10}BL-65.90$ ($R^2=0.67$), and $TS_{120kHz}=20{\log}_{10}BL-66.65$ ($R^2=0.65$). These results can be used fundamental data in order to estimate distribution and biomass of jack mackerel by using hydro-acoustic method.

Keywords

Jack mackerel;Target strength;Kirchhoff-ray mode model;Swimmbladder

Acknowledgement

Supported by : 국립수산과학원

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