The Experimental Study on Stability of The Berm Breakwater

By 2D and 3D wave physical model test, the stability of a berm breakwater which was built in Qingdao, China was studied. The purpose of 3D model was to study the breakwater stability under the oblique wave action. The cross-section of breakwater and plan layout which meet the design requirement were obtained by experiment. Comparison was made for the difference of rocks moving form on the slope and the final dynamical equilibrium section under the oblique wave action and normal wave action. When incidence wave direction is normal the shape of the final dynamical equilibrium section presents reverse "S" and the movement of stones is the reciprocating motion along armor slope in the vertical direction range. When wave incidence direction is oblique, the armor stones except in the movement of vertical and there still exists in the horizontal transportation. When the armor stones at the place existed horizontal transportation can not be supplemented, the breakwater may be unstable. The research results can provide the valuable experience for the similar projects.