Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Selection of mother wavelet for bivariate wavelet analysis

이변량 웨이블릿 분석을 위한 모 웨이블릿 선정

  • Lee, Jinwook (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Hyunwook (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Yoo, Chulsang (Department of Civil, Environmental and Architectural Engineering, Korea University)
  • 이진욱 (고려대학교 건축사회환경공학과) ;
  • 이현욱 (고려대학교 건축사회환경공학과) ;
  • 유철상 (고려대학교 건축사회환경공학과)
  • Received : 2019.09.17
  • Accepted : 2019.10.09
  • Published : 2019.11.30
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Abstract

This study explores the effect of mother wavelet in the bivariate wavelet analysis. A total of four mother wavelets (Bump, Mexican hat, Morlet, and Paul) which are frequently used in the related studies is selected. These mother wavelets are applied to several bivariate time series like white noise and sine curves with different periods, whose results are then compared and evaluated. Additionally, two real time series such as the arctic oscillation index (AOI) and the southern oscillation index (SOI) are analyzed to check if the results in the analysis of generated time series are consistent with those in the analysis of real time series. The results are summarized as follows. First, the Bump and Morlet mother wavelets are found to provide well-matched results with the theoretical predictions. On the other hand, the Mexican hat and Paul mother wavelets show rather short-periodic and long-periodic fluctuations, respectively. Second, the Mexican hat and Paul mother wavelets show rather high scale intervention, but rather small in the application of the Bump and Morlet mother wavelets. The so-called co-movement can be well detected in the application of Morlet and Paul mother wavelets. Especially, the Morlet mother wavelet clearly shows this characteristic. Based on these findings, it can be concluded that the Morlet mother wavelet can be a soft option in the bivariate wavelet analysis. Finally, the bivariate wavelet analysis of AOI and SOI data shows that their periodic components of about 2-4 years co-move regularly every about 20 years.

본 연구에서는 이변량 웨이블릿 분석에 있어 모 웨이블릿이 어떤 영향을 미치는지를 파악하였다. 모 웨이블릿으로는 관련 연구에서 많이 사용되고 있는 총 네 가지(Bump, Mexican hat, Morlet, Paul)를 선정하였다. 이들 모 웨이블릿은 먼저 백색잡음과 다양한 주기의 사인곡선을 결합하여 만든 시계열의 이변량 분석에 적용하여 그 결과를 평가하였다. 또한 실제 시계열인 북극진동지수(AOI)와 남방진동지수(SOI)를 이변량 분석하여 모의된 시계열의 분석 결과가 실제 자료의 분석결과에도 일관되게 유지되는지를 판단하였다. 본 연구의 결과를 요약하면 다음과 같다. 먼저, Bump와 Morlet 모 웨이블릿의 경우가 이론적인 예측에 보다 잘 부합하는 것으로 나타났으며, 반대로 Mexican hat 모 웨이블릿은 상대적으로 단주기의 변동 특성을, Paul 모 웨이블릿의 경우에는 장주기의 변동 특성을 잘 보여주는 것으로 나타났다. 둘째, Mexican hat과 Paul 모 웨이블릿의 경우에는 스케일 간섭이 매우 크게 나타남을 확인할 수 있었다. Bump와 Morlet 모 웨이블릿에서는 이러한 문제점이 나타나지 않았다. 소위 동조화(co-movement)를 탐색하는 능력은 Morlet와 Paul 모 웨이블릿이 가지고 있는 것으로 파악되었다. 특히, Morlet의 경우 이 특성이 더욱 명확히 나타남을 확인하였다. 결과적으로 Morlet 모 웨이블릿이 이변량 웨이블릿 분석에 가장 무난한 것으로 확인되었다. 마지막으로, AOI와 SOI 자료의 이변량 웨이블릿 분석에서는 대략 2-4년 정도의 주기성분이 약 20년 빈도로 서로 동조하고 있음을 확인할 수 있었다.

Keywords

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