Laboratory tests and semi-analytical analysis are carried out to investigate the wave resonance in a narrow gap between a fixed floating box and a vertical wall. The mechanical energy dissipation involved in the fluid resonance is concerned. The experimental tests confirmed that the resonant wave height increases slowly with the incident wave height, which is lower than a linear function. The reflection coefficient shows complex non-linear dependence on the body draft, gap width and incident wave height. The experimental results associated with resonant wave height and reflection coefficient shed insights on the mechanism of energy dissipation. Semi-analytical results with calibrated damping coefficient are presented and good agreements with experimental data are obtained.

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