The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Size estimation of Sperm Whale in the East Sea of Korea using click signals

동해에서 발견된 향고래의 클릭 신호를 이용한 전장 추정

  • 윤영글 (한양대학교 해양융합과학과) ;
  • 최강훈 (한양대학교 해양융합과학과) ;
  • 한동균 (한국해양과학기술원 부설 극지연구소) ;
  • 손호선 (국립수산과학원 고래연구센터) ;
  • 최지웅 (한양대학교ERICA 해양융합공학과)
  • Received : 2020.10.06
  • Accepted : 2020.11.16
  • Published : 2020.11.30
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Abstract

A total length of sperm whales can be estimated by measuring the Inter-Pulse Interval(IPI) of their clicks composed by multiple pulses. The IPI is caused by the two-way travel time of the sound transmission in the spermaceti within the whale head. Therefore, the IPI can be used to measure the whale's total length based on allometric relationships between head and body length. In this paper, the click signals recorded in the East Sea, Korea in 2017 were analyzed to estimate the size of sperm whales. The size of sperm whales calculated by the relationship between IPI and body length was 9.9 m to 10.9 m, which is corresponding to the size of an adult female or a juvenile male sperm whale. This non-lethal acoustic method has been demonstrated to accurately estimate the sperm whale size, and can provide useful information for domestic sperm whale monitoring.

향고래 전장은 향고래가 발생시키는 클릭의 다중 펄스 구조로 인한 펄스 간 간격(Inter-Pulse Interval, IPI)을 이용하여 추정할 수 있다. IPI는 고래 머리 내부의 경랍에서 왕복 이동시간에 의한 시간지연으로 인해 발생하며, 향고래의 전장과 두장의 비례관계를 이용하여 향고래의 전장을 추정한다. 본 연구에서는 2017년 동해, 포항 앞바다에서 발견된 향고래의 크기를 추정하기 위해 현장에서 측정한 클릭 신호를 분석하였다. IPI와 향고래 크기의 관계식에 의해 계산된 향고래의 전장은 성체 암컷 또는 유년기 수컷의 크기인 9.9 m ~ 10.9 m로 추정되었다. 이 방법은 향고래에게 치명적이지 않으며 크기 추정에 대한 정확성이 검증되었으므로, 국내 향고래 모니터링에 유용한 정보를 제공할 수 있다.

Keywords

References

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