This thesis deals with the calibration and use of a 2D numerical model of sea waves. In the theoretical part, the characteristic properties of the wave profile, the basics of sea waves, and submerged breakwaters were explored. The Dual SPHysics numerical modelling program and the Design SPHysics graphical interface were presented. The program is based on the SPH mesh-free method, the basics of which were presented. In the first set of simulations, the numerical model was calibrated and validated based on the measurements from the physical wave generator and it was examined how the slope of the smooth coastline affects the wave run-up. In the second set of simulations, the impact of different geometric properties of submerged breakwaters on wave action was tested. For trapezoidal breakwaters, different distances of breakwaters from the shoreline, various slopes, structure heights, and crown widths were tested. For rectangular breakwaters, only different heights of the structure and crown widths were tested. The results showed that the height of breakwaters had the most significant impact on the wave action, while their slope had the least effect. No apparent correlation was found between the location of the breakwater and its effect, but a clear connection was observed between the width of the crown and the reduction of waves.
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