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2015 Vol.34, Issue 6
Overview of the KIOST-HYU Joint Experiment for Acoustic Propagation in Shallow Water Geological Environment

천해 지질환경에서의 음파전달 특성 연구를 위한 KIOST-한양대 공동실험 개요

Sungho Cho1
,
Donhyug Kang1
,
Cheol-Ku Lee1
,
Seom-Kyu Jung1
,
Jee Woong Choi2
,
Suntaek Oh1*
조 성호1
,
강 돈혁1
,
이 철구1
,
정 섬규1
,
최 지웅2
,
오 선택1*
1Department of Maritime Security Research Center, Korea Institute of Ocean Science & Technology
1한국해양과학기술원 해양방위연구센터
2한양대학교 해양융합과학과 해양음향연구실
*교신저자. *Corresponding Author. 
30 November 2015. pp. 411-422
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Abstract

This paper presents an overview of the geological environment investigation and underwater acoustic measurements for the purpose of “Study on the Relationship between the Geological Environment and Acoustic Propagation in Shallow Water”, which are jointly carried out by KIOST (Korea Institute of Ocean Science & Technology) and Hanyang University in the western shallow water off the Taean peninsula in the Yellow Sea in April-May 2013. The experimental site was made up of various sediment types and bedforms due to the strong tidal currents and coastal geomorphological characteristics. The geological characteristics of the study area were intensively investigated using multi-beam echo sounder, sub-bottom profiler, sparker system and grab sampler. Acoustic measurements with a wide range of research topics in a frequency range of 20~16,000 Hz: 1) low frequency sound propagation, 2) mid-frequency bottom loss, 3) spatial coherence analysis of ambient noise, and 4) mid- frequency bottom backscattering were performed using low- and mid-frequency sound sources and vertical line array. This paper summarizes the topics that motivated the experiment, methodologies of the acoustic measurements, and acoustic data analysis based on the measured geological characteristics, and describes summary results of the geological, meteorological, and oceanographic conditions found during the experiments.

Keywords
Shallow water acoustics
Geological environmental information
Acoustic propagation
Ambient noise
Reverberation

본 논문은 “천해 지질환경과 음파전달환경과 상호 연계 연구”를 목적으로 한국해양과학기술원과 한양대학교 가 2013년 4~5월에 경기만 태안반도 서쪽에 위치한 천해환경에서 공동으로 수행한 지질환경 조사 및 수중음향 실험에 대한 개요를 기술하였다. 실험지역은 강한 조류와 천해의 지형학적 특성에 의해 다양한 종류의 퇴적상과 베드폼이 형성되는 해역이다. 집중적인 지질환경 특성 조사를 위해 다중음향측심기, 천부지층탐사기, 중천부지층탐사기, 그랩을 이용하여 조사해역의 지질환경 특성을 파악하였으며, 저주파수, 중주파수 대역의 음원과 수직선배열청음기를 이용하여 주파수 200~16,000 Hz 대역에서 1) 저주파수 음파전달, 2) 중주파수 해저면 반사손실, 3) 주변소음의 공간 코히런스 분석, 4) 중주파수 해저면 후방산란에 대한 연구 주제로 해상실험이 수행되었다. 본 논문에서는 연구지역에서 음향실험을 실시한 동기, 음향실험 방법론과 측정된 지질자료를 기반으로 음향자료 해석과, 실험기간 동안 측정된 지질환경, 기상․해양물리 자료를 요약 정리하여 기술하였다.

키워드
천해 음향학
지질환경
음파전달
수중소음
잔향음
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 34
  • No :6
  • Pages :411-422
  • Received Date : 2015-04-23
  • Revised Date : 2015-06-29
  • Accepted Date : 2015-07-22
  • DOI :https://doi.org/10.7776/ASK.2015.34.6.411
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