Abstract: “The study presents the results of an experimental study of wave run - up over the breakwaters with cube units havi ng different porosity due to different placement method. The cube units were placed by double pyramid method. By using this method two different porosities were obtained. For the first placement the porosity was 33% and for the second placement the porosit y was 43%. The laboratory tests on cube breakwaters exposed irregular waves were studied. The results of the tests showed that the placement configuration of cube units had an important impact on wave run - up.”

Keywords: breakwater, run–up, cube units, porosity, irregular wave.