In this paper a space-averaged Navier–Stokes approach has been deployed to simulate wave propagation over a submerged
breakwater. The developed model is based on the smoothed particle hydrodynamic (SPH) method, which is a pure
Lagrangian approach and can handle large deformations of the free surface with high accuracy. For this study, the large
eddy simulation (LES) model was chosen as the turbulence model to couple with the weakly compressible version of the
smoothed particle hydrodynamics (WCSPH) method to simulate the wave propagation over a submerged breakwater on
a sloped bed. The results of numerical simulations were compared with experimental results and a good agreement was
achieved. Finally, it is shown that the WCSPH method provides a useful tool to investigate the wave transmission and performance
of the submerged breakwaters.