Estimation of JONSWAP Spectral Parameters by Using Dependent-Variables Analysis

Accurate estimation of JONSWAP parameters provides essential information for initial planning and design of coastal and ocean structure, as well as for later design modification or alternatives that could bear on either mitigation or environmental changes or enhancement of other aspects of the environment. Based on the demand of reliable field wave measurement, an oceanography observation network, which consists of 6 buoy stations around Taiwan. In present study, it is the purpose to obtain the JONSWAP parameters from the observation stations. It is found that different parameter sets might give similar spectral shapes due to the fact that there is high dependency between parameters α and γ. On the other hand, various values of the parameters will be obtained depending on different data fitting procedures. The differences of the parameter values range up to 15%, which should not be neglected. At last, the γ of the winter monsoon waves is from 1.44 to 1.69 in the western coast, and 2.09 to 2.66 in the eastern coast.