Hydraulic Performance of Low-crested Breakwaters Protecting a Beach Nourishment in an Energetic Swell Wave Climate

This paper presents the design process of a coastal protection design in an energetic swell wave climate, consisting of a low-crested breakwater structure in combination with a beach nourishment inside a groyne scheme. Hydraulic conditions and morphological stability have been assessed using 1D and 2DH (non-hydrostatic) XBeach models, calibrated based on 2D physical model testing results. The hydraulic stability and wave transmission of various designs has been assessed using the same 2D physical model testing, resulting in an optimized design of the low-crested breakwater structure. The overall coastal protection scheme, including beach stability, has been verified by 3D model testing.