The paper presents an experimental investigation of obliquely incident wave reflection at low-crested structures within the EU-funded project DELOS. The physical model tests were carried out with incident wave attack angles varying over a wide range from 0° to 60° at a multidirectional wave basin. Data comparisons suggest that long-crested and short-crested waves give similar reflection from low-crested structures. The reflection coefficient is noticeably dependent on the wave angle of incidence. On the basis of the test data, two wave reflection formulae including the influence of incident angles are proposed for low-crested rubble mound structures and smooth structures respectively. Wave spectra analyses show that the reflected peak period is quite close to the incident peak period, and the reflected directional waves more widely spread than the incident waves.
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