Abstract
Wave attenuation performance is the prime consideration when designing any floating breakwater. For a 2D hydrodynamic analysis of a floating breakwater, the wave attenuation performance is evaluated by the transmission coefficient, which is defined as the ratio between the transmitted wave height and the incident wave height. For a 3D breakwater, some researchers still adopted this evaluation approach with the transmitted wave height taken at a surface point, while others used the mean transmission coefficient within a surface area. This paper aims to first examine the rationality of these two evaluation approaches via verified numerical simulations of 3D heave-only floating breakwaters in regular and irregular waves. A new index—a representative transmission coefficient—is then presented for one to easily compare the wave attenuation performances of different 3D floating breakwater designs.
Highlights
Floating breakwaters have been used to provide safe harborage and to protect shorelines
For 2D floating breakwaters under regular waves, the wave attenuation performance is evaluated by using the transmission coefficient (Kt ) which is defined as the ratio between the transmitted wave height (Ht ) and the incident wave height (HI )
This paper numerically examines the transmitted wave field and possible approaches the wave attenuation of 3D floating in regular for quantifying for thequantifying wave attenuation performance of performance
Summary
Floating breakwaters have been used to provide safe harborage and to protect shorelines. Floating breakwaters usually have a low wave attenuation performance for long waves (as compared to the breakwater width). Their mooring systems may be more susceptible to damage under extreme wave action. For 2D floating breakwaters under regular waves, the wave attenuation performance is evaluated by using the transmission coefficient (Kt ) which is defined as the ratio between the transmitted wave height (Ht ) and the incident wave height (HI ). The incident wave height and transmitted wave height can be determined from the measured wave elevations. These approaches for determining the transmission coefficients for
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