Experimental Design And Performance Study On Scrap Tire Floating Breakwater Model

In recent years, the application of floating breakwaters has been more and more brought to engineering and research people's attention, especially for the wave attenuation performances and mooring force's characteristics. So it is required that this structure have good wave attenuation performances and the better mooring force's characteristics. Simultaneously because at present the research for experimental design and technology,wave attenuation performances and mooring force's characteristics of scrap tire floating breakwaters are on the blank stage, comprehensively considered the mechanism of dissipating wave, such as inner friction and interfering water particles trace, and increased stiffness to decrease flexible structure tail making-wave, wave-guard FTB were adoption.According to Froude and Cauchy criterion, small scale wave-guard FTB model was design. First, laboratory physical model experiments were performed to verify similarity relation and feasibility of small scale model experiments. Second, it was performed to study the wave attenuation performances and mooring force's characteristics of wave-guard FTB models, influence of model parameters (relative breakwater width B/L,mooring chain length Lt, stiffness of mooring chain k, and so on) on hydrodynamic performances are discussed with 2D in regular waves. Experiments results were showed on the blew:Wave Attenuation Performance of Models: Respectively considered the influence of model parameters, relative breakwater width B/L,mooring chain length Lt, stiffness of mooring chain k, for wave transmission coefficient. The primary model parameters is relative width. As the increase of relative width, the transmission coefficient is descended with any influence of model parameters. With the breakwater width is more than 0.6 wave length, wave transmission coefficient is less than 0.5, can play a very good effect in dissipating waves; mooring chain length Lt and stiffness of mooring chain k have no obvious effect in wave transmission coefficient.Mooring forces Characteristics: Because the onside mooring force is more than offside mooring force, the paper only study onside mooring force. Respectively considered the influence of model parameters, relative breakwater width B/L,mooring chain length Lt, stiffness of mooring chain k. With different influence of model parameters have different results for mooring forces. As the increase of k and the decrease of Lt, the transmission coefficient is increased. The natural period of flexible model has obvious effect for mooring forces. At one B/L, the mooring forces have a peak.Design models,verify feasibility and analysis for wave attenuation performances and mooring force's characteristics on different influence factors are discussed with the influence of model parameters in paper. It can provide references for future design and application.