EFFECTS OF IRREGULAR WAVE PARAMETERS ON BERM RECESSION OF RESHAPING BERM BREAKWATERS

The berm recession of a reshaping berm breakwater has a very important role in the stability and reshaping of this structure. In this research, the recession of the berm due to wave parameters has been studied based on 2D experimental modeling method in a wave flume. Irregular waves with JONSWAP spectrum were used. A total of 60 tests have been performed to cover the impact of wave parameters such as significant wave height, mean wave period and storm duration on berm recession. A new dimensionless parameter is introduced to evaluate the simultaneous influence of wave height and wave period. Then, a new formula that includes the wave parameters is derived using the new dimensionless parameter for estimating the berm recession. A comparison is made between the estimated berm recessions by this new formula and formulae given by other researchers. The results of this new formula in comparison with the other investigators formula show a proper correlation with the present experimental data and other experimental results.