Field measurements of long-period wave have been preformed for the Gamcheon harbor in Korea. A Galerkin finite element model based on the extended mild-slope equation has bee ndeveloped for simulating harbor oscillation more accurately. Infinite and joint elements are introduced to accomodate radiation condition at infinity and matching conditions at harbor mouth for the consideration of theenergy loss due to flow separation, respectively. Comparisons with the resutls obtaiend by hydraulic experiments by Lepelletier (1980) show that the present model gives fairly good resutls. Model resutls reveal that the influence of entrance loss at the harbor mouth is considerably significant. From the application to the Gamcheon Harbor it is seen that the computed resonant periods and amplification ratios well agree with the measured results. The entrance loss effects were found to be insignificant unless the incident wave height is large.
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