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

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Parameter Estimation and Fitting Error Analysis of the Representative Spectrums using the Wave Spectrum off the Namhangjin, East Sea

남항진 파랑 스펙트럼 정보를 이용한 대표 스펙트럼 매개변수 추정 및 분석

  • Cho, Hong Yeon (Marine Bigdata Center, Korea Institute of Ocean Science and Technology, University of Science and Technology) ;
  • Jeong, Weon Mu (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Oh, Sang-Ho (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology) ;
  • Baek, Won Dae (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology)
  • 조홍연 (한국해양과학기술원 해양빅데이터센터) ;
  • 정원무 (한국해양과학기술원 해양ICT융합연구센터) ;
  • 오상호 (한국해양과학기술원 연안개발.에너지연구센터) ;
  • 백원대 (한국해양과학기술원 해양ICT융합연구센터)
  • Received : 2020.08.24
  • Accepted : 2020.10.19
  • Published : 2020.10.31
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Abstract

The parameters of the modified BM and JONSWAP spectra are estimated using spectral data set off Namhangjin, located in the east coast of Korea, collected during high wave events. The parameters of the modified BM spectrum were estimated to be 1.04 and 0.27, which were similar to the conventional values of 1.098 and 0.30, but showed significant differences in statistical terms. On the other hand, the peak enhancement factor of JONSWAP spectrum was estimated to be 1.4, which was substantially small compared to the conventional value of 3.3. The RMSE differences from the fitted results of the two spectra were small, approximately 0.2. In the frequency range greater than the peak frequency, however, the spectral energy density showed relatively mild decrease with increase of the frequency, compared to the standard forms of the modified BM and JONSWAP spectra.

우리나라 동해 남항진 해역에서 관측한 고파 파랑 스펙트럼 정보를 이용하여 수정 BM 스펙트럼과 JONSWAP 스펙트럼의 매개변수를 추정하였다. BM 스펙트럼의 매개변수 추정결과는 1.04, 0.27로 대푯값으로 제시된 1.098, 0.30과 유사하였으나 통계적으로는 유의미한 차이를 보였다. 한편 JONSWAP 스펙트럼의 경우에는 첨두증대계수의 값이 통상적으로 적용되는 값인 3.3보다 매우 작은 1.4로 추정되었다. 두 스펙트럼의 적합 RMS 오차 차이는 0.2 정도로 미미한 수준이었으나, 두 스펙트럼 모두 첨두주파수보다 큰 주파수 영역에서의 에너지가 표준 스펙트럼 형태에 비해 상대적으로 완만하게 감소하는 양상을 보였다.

Keywords

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