Performance of vertical wall and floating breakwaters combination for Datca marina

Abstract

Datca Marina is located at the South Western corner of Turkey at the Mediterranean Sea with steep sea bottom slopes (1/3-1/5). The water depths are changing between 4m to 37m at the breakwater location. Considering the high water depths and the wave characteristics, floating breakwater could be a good alternative for the marina. However, the performance of the floating breakwater may be limited due to the longer periods of the waves coming from E to SSE direction range. Therefore both a floating breakwater composed of 20 m length segments (B=5m wide, h=2,9m high) of total 526m and a vertical wall breakwater of 362m are decided to use for protecting the Marina against waves. The performance of the vertical wall and floating breakwaters combination is investigated by 3D hydraulic model experiments. Hydraulic model tests showed that the significant wave height may exceed 0.3m only 1,08% of the year. It is also found that floating breakwater is much more efficient under oblique wave attack and it is proposed to use the projection of oblique wave length to predict transmission coefficients of oblique waves.