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Decomposition of Tidal Residual Data Using a Wavelet Method and Characteristic Analysis of Their Short-period Components

웨이블릿방법을 이용한 조위편차 성분 분리 및 단주기 특성 분석

  • Kang, Ju Whan (Dept. of Civil Engineering, Mokpo National University) ;
  • Kim, Yang-Seon (Dept. of Civil Engineering, Mokpo National University) ;
  • Cho, Hongyeon (Marine Environment and Conservation Research Division, Korea Institute of Ocean Science and Technology)
  • 강주환 (목포대학교 토목공학과) ;
  • 김양선 (목포대학교 토목공학과) ;
  • 조홍연 (한국해양과학기술원 해양환경보전연구부)
  • Received : 2013.05.22
  • Accepted : 2013.06.26
  • Published : 2013.06.29

Abstract

The fact that tidal residuals are detected greatly at the tide-dominated region implies that tide component has still remained in the tidal residual. Auto-correlation function analysis also show that the auto-correlation coefficients are conspicuous near tidal periods at the Western Coast. A wavelet method was used to analyze characteristics of the short period or tide-relevant residuals. Considering the results that tidal period is prominent at the tide-dominated region, that seasonal variation is trivial at the short periods, and that shallow tidal period is conspicuous at Mokpo, the short period can be considered to be correlated with tide modulated surge. The result also shows short period components stem mainly from tide-forecasting error and tide-surge interaction. Thus tide modulated surge must be distinguished from meteorological surge.

조차가 큰 해역에서 조위편차 역시 크게 나타나고 있음은 조위편차 내에 조석성분이 남아있음을 의미한다. 상관관계함수를 통한 분석을 시행한 결과에서도 서해안 해역에서 조석주기 부근의 자기상관계수가 크게 나타나고 있어 이러한 사실을 뒷받침하고 있다. 조위편차의 단주기성분에 해당하는 이러한 조석관련성분을 분석하기 위하여 웨이블릿분석을 시행하였다. 분석 결과에 의하면 조차가 클수록 조석주기성분이 크게 나타나고 있으며 단주기 성분에서 계절별 변화가 심하지 않다는 점과 목포의 경우 천해조성분인 6시간 주기성분이 유독 크게 나타나고 있다는 점에서 단주기 성분과 조석관련성분의 관련성을 연관지을 수 있다. 이와 함께 24시간 이내 단주기 성분의 조위편차는 조석예측오차 및 조석-해일 비선형성 등에 주로 기인하고 있는 것으로 파악되었다. 이러한 조석변조해일성분은 조석자체에 기인하므로 기상조 성분인 해일고와는 구분되어야 한다.

Keywords

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  2. Frequency Analysis on Surge Height by Numerical Simulation of a Standard Typhoon vol.28, pp.5, 2016, https://doi.org/10.9765/KSCOE.2016.28.5.284
  3. Appearance of Tide-surge Interaction along the West/South Coasts vol.26, pp.6, 2014, https://doi.org/10.9765/KSCOE.2014.26.6.352