In addition, the results reflected that the layer porosity is a critical factor in layers made of concrete units. It was also observed that the continuity of the armour layer until a deeper level reduced the recession when the front slope was continuous. In addition, they experienced lower recession than the models with rock when they were exposed to high waves.
The tests shown that models built with concrete cubes in the armour layer experience the same recession than the same model built with rock when they were exposed to low waves.
Finally, it was concluded that, based on the data obtained during the tests, concrete cubes have a very good behaviour in berm breakwater structures. The results were also compared with Tørum recession equation to know the usefulness of the equation with concrete blocks. The test runs are based on replicas of the two major storms recorded close to the Sirevåg harbour, and had been used before for other berm breakwater studies at NTNU.The results from the different model tests were compared with each other and with a previous investigation with berm breakwater built with rocks. The tests were carried out with irregular waves. The wave program consisted in 7 different wave steps contained a total of 16.000 waves approximately. The modifications consisted in the replacement of the class I stone form the armour layer by two different concrete units, cubes and cubipodsThe design waves were Hs,100=7.0 m, Tz=10.6 s. All the models were modifications of the Sirevåg berm breakwater. To achieve this, five breakwater models were tested with the same wave program. The objective of this thesis is to test the hydraulic stability of berm breakwaters with concrete armour units.
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