Investigation of wave long time spectral function and wave characteristics in Persian Gulf

Long time spectral wave function F(ω)dω, gives the amplitude of the wave between ω and ω+dω. This function is one of the main parameters in both, design and maintenance of breakwaters, oil platforms, and coastal line. Direct measurement of this parameter costs too much, so it should be measured by indirect way. Assessment of the wave amplitude time series is a way to find this function. The frequency spectrum of stationary random process may be computed via two integral operation namely, auto covariance and Fourier transformation. The purpose of this study is to evaluate the wave long time spectrum function, by calculating auto covariance function. We have used the data measured every hour in Bushehr for a month by Ports and Shipping Organization of Iran. Analyses of this stationary time series, using Fourier transformation for auto covariance function, shows that the dominant frequency is 0.42 Hz. In this study, correlation between non dimensional wave parameter is evaluated and Phillips parameter is obtained to be 0.0013.