Transmission coefficients of a floating rectangular breakwater with porous side plates

Abstract

The interaction between incident waves and a floating rectangular breakwater with the vertical porous side plates has been investigated in the context of the two-dimensional linear potential theory. The matched eigenfunction expansion method(MEEM) for multiple domains is applied to obtain the analytic solutions. The dependence of the transmitted coefficients and motion responses on the design parameters, such as porosity and protruding depth of side plates, is systematically analyzed. It is found that the non-dimensional wavelength where the sudden drop of transmission coefficients occurs, corresponds to the heave resonant frequency obtained from Ruol et al. (2013) for p-type floating breakwater. It is concluded that both properly selected porosity and deeper protruding depth of side plates are helpful in reducing the transmission coefficients and also extending the wider applicable extent of incident wavelength for performance enhancement.

Analytical Model of Wave Loads and Motion Responses for a Floating Breakwater System with Attached Dual Porous Side Walls

“…Again, the summation of terms with the infinite series is approximated by a large but finite numbers of terms, e.g., a total of M terms. Then, the unknown coefficients (1) , (1) , (1) , (1)…”

“…Protection of the shoreline structures or offshore production facilities by degradation of the wave-structure interaction is therefore a vital issue in the coastal and offshore engineering applications. Various artificial structures have been designed and optimized for this purpose, of which the floating breakwaters or barriers are considered as valuable alternatives to conventional fixed gravity-type breakwaters [1]. The performance optimization of a breakwater, especially the type of floating breakwater, has received much attention with the advantage of energy dissipation [2].…”

Extracting the Solution of Three-Dimensional Wave Diffraction Problem from Two-Dimensional Analysis by Introducing an Artificial Neural Network for Floating Objects

“…Since all the structures in offshore and coastal areas -such as Floating Breakwaters (FBWs) -are exposed to water waves, it is necessary to analyze the effects of such structures on the surrounding wave domain (Abbasnia and Ghiasi (2014); Shahrabi and Bargi (2019)). By assuming linear waves and employing the superposition principle, in the investigation of wave-floating structures interaction, two distinct phenomena should be considered (Abul-Azm and Gesraha, 2000;Kao et al, 2015;Cho, 2016). The first phenomenon consists of a forced vibration assumption for structure and calculating radiated waves in non-disturbed fluid media.…”

Hydrodynamic performance of floating breakwaters in long wave regime: An experimental study

“…In addition, they developed an empirical relationship between the actual plate porosity and the theoretical porous parameter by using systematic experimental data. Cho [22] developed analytical solutions for a single pontoon floating breakwater with the vertical porous side plates using the matched eigenfunction expansion method. Through the parametric study, they concluded that both properly selected porosity ad deeper protruded side plates can improve the blocking performance of this π-type floating breakwater.…”