Abstract
Indonesia is currently active in developing coastal areas, especially for growing the coastal protection structure from erosion problems. One solution to deal with the erosion problem is by using artificial reef breakwater. Based on previous research, the artificial breakwater with reef ball type has the greatest performance in reducing wave energy. This research aims to analyze the numerical model about flow characteristics on artificial reef breakwater with actual scale by using Flow3D software. The result from this research shows that with the bigger wave, the steepness value (Hi/gT2), coefficient transmission (KT), and coefficient diffraction (KD) value will decrease. The coefficient transmission value from this research ranges from 0.4 to 0.6, and for coefficient diffraction value ranges from 0.2 to 0.4. It means that submerged breakwater with reef ball type can perform well in reducing wave height and can be used to trigger off a breaking wave. Then, the analysis of the sand alignment profile estimates that the salient will appear around 28 m from the origin coastline, and the ranges of stable slope (nf) are 4≤Sn≤S16.