Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Estimation and Analysis of Wave Spectrum Parameter using HeMOSU-2 Observation Data

HeMOSU-2 관측 자료를 이용한 파랑 스펙트럼 매개변수 추정 및 분석

  • Lee, Uk-Jae (Marine Bigdata Center, Korea Institute of Ocean Science & Technology) ;
  • Ko, Dong-Hui (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science & Technology) ;
  • Kim, Ji-Young (Korea Electric Power Research Institute) ;
  • Cho, Hong-Yeon (Marine Big-data Center, Korea Institute of Ocean Science and Technology, University of Science and Technology)
  • 이욱재 (한국해양과학기술원 해양빅데이터센터) ;
  • 고동휘 (한국해양과학기술원 연안개발에너지연구센터) ;
  • 김지영 (한국전력공사 전력연구원) ;
  • 조홍연 (한국해양과학기술원 해양빅데이터센터, 과학기술연합대학원 대학 KIOST SCHOOL)
  • Received : 2021.11.10
  • Accepted : 2021.11.30
  • Published : 2021.12.31
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Abstract

In this study, wave spectrum data were calculated using the water surface elevation data observed at 5Hz intervals from the HeMOSU-2 meteorological tower installed on the west coast of Korea, and wave parameters were estimated using wave spectrum data. For all significant wave height ranges, the peak enhancement parameter (γopt) of the JONSWAP spectrum and the scale parameter (α) and shape parameter (β) of the modify BM spectrum were estimated based on the observed spectrum, and the distribution of each parameter was confirmed. As a result of the analysis, the peak enhancement parameter (γopt) of the JONSWAP spectrum was calculated to be 1.27, which is very low compared to the previously proposed 3.3. And in the range of all significant wave heights, the distribution of the peak enhancement parameter (γopt) was shown as a combined distribution of probability mass function (PMF) and probability density function (PDF). In addition, the scale parameter (α) and shape parameter (β) of the modify BM spectrum were estimated to be [0.245, -1.278], which are lower than the existing [0.300, -1.098], and the result of the linear correlation analysis between the two parameters was β = -3.86α.

본 연구에서는 국내 서해안에 설치된 HeMOSU-2 기상타워에서 5 Hz 간격으로 관측한 수면변동자료를 이용하여 파랑 스펙트럼 정보를 산정하였으며, 이를 통해 파랑 매개변수를 추정하였다. 모든 유의 파고 범위에 대하여 관측 스펙트럼을 기준으로 JONSWAP 스펙트럼의 첨두증대계수(γopt)와 수정 BM 스펙트럼의 척도계수(α) 및 형상계수(β)를 추정하였으며, 각각의 매개변수 분포를 확인하였다. 분석 결과, JONSWAP 스펙트럼의 첨두증대계수(γopt)는 기존에 제안되고 있는 3.3에 비해 매우 낮은 수준인 1.27로 산정됐으며, 전체 파고 범위에서 첨두증대계수(γopt)의 분포는 확률질량함수와 확률밀도함수의 결합형태로 나타났다. 또한, 수정 BM 스펙트럼의 척도계수(α) 및 형상계수(β)는 기존 [0.300, -1.098]에 비해 낮은 수준인 [0.253, -1.377]로 추정됐으며, 두 매개변수간 선형 상관관계 분석 결과 β = -3.86α로 나타났다.

Keywords

Acknowledgement

본 연구는 해양수산부의 "독도의 지속가능한 이용연구 - 독도 데이터베이스 구축 관리 및 독도종합정보시스템 개편(과제번호: PG-52262)"의 일환으로 수행되었습니다. 연구지원에 감사드립니다.

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