The mathematical model is presented to analyze the wave spectrum inside Paradip port under the resonance conditions with partial reflection, diffraction and refraction. During the extreme weather conditions, Paradip port have experienced the extreme ocean wave 3∼5 m in surface height. In irregular domain, the solution of Laplace equation along with partial refection condition on quays and breakwaters is obtained by using 3-D Boundary Element Method (3-D BEM). To validation, the present numerical scheme result is compared with the experimental data of Ippen & Goda (1963) and Lee (1971). Six record stations are located inside the port based on moored ship terminals. At these locations, the wave spectrum is computed by utilizing the Fast Fourier Transform (FFT) for the surface waves obtained in Paradip port.

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