Experimental Study Of Wave-dissipating Performance Of Composite Breakwater

Nowadays, the study and practical applications of penetrating breakwater have made some progress. However, currently when being used as one kind of permanent wave-resist facility, the penetrating breakwater has some problems in itself:once the wave that holds great energy goes through the penetrating breakwater, it will make the wave in the harbor stronger and stronger, which can ruin the port's stability, especially when it comes to the wave with long period, it is impossible for the general penetrating breakwater to reach good cover effect; on the other hand, the strong wave force that acts on the upper part of the penetrating breakwater is mostly undertook by the bottom buttress and base, and it is very dangerous in bad weather condition. So, it is very useful and practical for us to design one kind of more reasonable penetrating breakwater.This thesis proposes one kind of compound penetrating breakwater composing of horizontal cylinder group near the surface and caisson at bottom. Through physical model test, reflection coefficient and transmission coefficient of wave are measured. Then analysis about the parameter (comparative width of B/L,caisson,number and position of horizontal cylinder,diameter of cylinder) of the compound penetrating breakwater's effect on the performance of weakening the wave is made.The result shows that the compound penetrating breakwater has good performance in diminishing the wave, and the parameter of comparative width of B/L,caisson,number and position of horizontal cylinder,diameter of cylinder show effect on the performance. The parameter of comparative width of B/L,position of horizontal cylinder and diameter of cylinder show most effect, and the caisson also has certain effect.