A 2-D experiment on the stability of structure segment, wave overtopping and wave forces on breakwater for reclamation engineering were carried out in a wave tank with hydraulic piston-type wave maker offered with reflection absorbing system. There are three options for the breakwater design, namely: caisson with curved perforated wall (Model 1), caisson with curved perforated wall and additionally a high crown wall (Model 2) and step-type caisson with low crest elevation in the front of sea side (Model 3). Three water levels are tested: extreme high water level (EHWL), design high water level (HWL) and the design low water level (LWL). Under the action of regular and irregular waves with 50 years return period, reflected wave by breakwater, second waves behind the breakwater caused by wave overtopping, wave overtopping discharge and the average thickness of water flow over the top of structure were measured, the stability of caissons, shoulder pad rubble and riprap mound as well were investigated.
Dongjiang Port is located in the northeast coast of Tianjin Port oriented to the Bohai bay. It is a peninsula-style port which is a reclamation area on the coastal zone, its north-south length is about 10.7 kilometers, from east to west the width is 3 kilometers, and the area is about 31.9 square kilometers (Fig. 1). To effectively prevent the artificial harbor off the waves on the beach and yacht marina, a breakwater in the east of Dongjiang Port was constructed. In order to meet the needs of the design of breakwater, so as to understand the stability of the breakwater structure units as well as the wave overtopping discharge and the wave forces on structures, a wave cross-section model test for breakwater construction was carried out.