Experimental Analysis and Numerical Simulations of Waves and Current Flows around Low-Crested Rubble-Mound Structures

The objective of this paper is to analyze flow patterns and velocity fields around rubble-mound low-crested structures based on wave basin experiments and 2DH numerical simulations. Experiments were performed in the 12.5×9.7 m2 wave basin at Aalborg University, Denmark, within the framework of the EU-funded project DELOS. Two different layouts were designed: two detached breakwaters with a gap in between and an oblique breakwater forming a rip channel with the basin side wall. Both cases of narrow and wide berm were tested under two- and three-dimensional regular and irregular wave attacks. Fluxes around and through the structures are examined by means of image analysis and measurements of free surface elevation and velocity at fixed locations. An original scheme for evaluating the overtopping discharge through a wave-by-wave analysis of wave gauge records over the barrier is described. Overtopping discharges are reconstructed and related to existing wave run-up models for emerged and zero-freeboard struc...

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