CHARACTERISTICS OF TIDE LEVEL AFFECTED BY KUROSHIO

S. Terachi, S. Ogata

Abstract

With the aim of better understandings on the tide level, which repeats a cyclic motion under the influence of a strong current “Kuroshio”, we observed it over a few years. We then analyzed its time series data on a time-frequency basis by wavelet and short time Fourier transform techniques using a Gabor function. The time-frequency representation revealed a remarkable effect of the winding of the current. With the beginning of the winding, a phase gap between 12 hrs and 24 hrs periodic modes resulted in markedly, and the reappearance period of these modes decreased from about 400 hrs to 300 hrs.

Keywords

tide level observation, wavelet transform, short time Fourier transform

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IMEKO-WC-2000-TC19-P581.pdf

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IMEKO TC

TC19 - Environmental Measurements

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