STUDY ON PERFORMANCE OF FLOATING BREAKWATER AND ITS NEW ARRANGEMENT
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Dynamic responses of two-dimensional and three-dimensional floating breakwaters have been discussed based onlaboratory experiments and numerical analysis. Two- and three-dimensional experiments have been conducted toinvestigate the dynamic behavior of floating unit for the floating breakwater. Wave height distributions have alsobeen measured in the experiments. The new type of floating breakwater arrangement has been proposed in thisstudy. Performance of proposed breakwater has been investigated. Numerical analysis has been carried out forboth two- and three-dimensional wave-floating breakwater interactions and validations of the analysis have beenexamined. Results show that the numerical analysis gives fairly good estimation of breakwater dynamics and wavedeformation due to breakwater. The floating breakwater arranged by the newly proposed method has beenconfirmed to reduce wave height behind the breakwater more than ordinal one.Keywords:
Breakwater
Conventional emerged rubble mound breakwaters are commonly built to protect ports and marinas from direct wave action. With increased high-valued developments in the coastal region, engineers have to design innovative coastal protection structures that can provide adequate harbor tranquility with minimum visual impact. One such solution is the combination of a submerged breakwater with a floating breakwater. In this paper, the open-source CFD model REEF3D (Bihs et al. 2016) is used to simulate wave interaction with a submerged porous breakwater with a floating breakwater on the lee side. The wave interaction with the submerged porous breakwater is validated by comparison with experimental data from Hieu and Tanimoto (2006). The validated model is then used to simulate the wave interaction with a combination of the submerged breakwater and the floating breakwater. The transmission coefficient across the combination is calculated to be about 12.5%, demonstrating the possibility to provide harbor tranquility with minimum visual impact.
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Submerged breakwater, as an important marine engineering structure, can effectively absorb wave energy and is widely used in marine engineering protection. As a new type of breakwater, porous medium breakwater has a certain influence on wave propagation. However, the influence of multiple porous medium submerged breakwaters on extreme waves remains to be studied. In the study, considering effects of extreme waves generated by hurricanes or tsunamis, the influence of the solitary wave on the multiple semi-circle porous medium breakwater is systematically investigated. According to the computational fluid dynamics theory, a numerical tank is established, in which the porous medium module is coupled. The computational capability of this model is verified first. Then, depending on the model, a series of cases are carried out to study the effects of different porous medium breakwaters on the propagation of the solitary wave. The results show that when the porosity is 0.8, the force on the submerged breakwaters is the smallest, and the water level and the velocity decrease seriously. With the increase in the diameter of the submerged breakwater, the wave profile gradually becomes flat. The higher the wave height, the more serious the wave deformation after passing through the submerged breakwater.
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