Cooperation Unit - Timorese Academic Journal of Science & Technology

Abstract: The frequency spectrum of tide level at Dili port is obtained by the Fast Fourier Transform (FFT) of the tide level during 4 months in time-domain. The spectrum shows two special peaks which are related to the gravitational motions of the moon and the sun, combined with the so-called 1/f fluctuation. The frequency spectrum is a type of low pass filter in electrical circuit and is approximately replicated well by a RC series connection, which is a Debye-type relaxation in dielectrics. This equivalency may cast a new insight for the 1/f noise. It is also reported that the histogram of the tide level in time-domain is approximated to be the Gaussian or the Weibull distribution function.  

Keywords: Tide Level,  Fast Fourier Transform (FFT), 1/f Noise, RC Equivalent Circuit