Abstract
In the present study, the porous breakwater system consisting of a porous block and a permeable barrier is analysed to understand the wave dissipation due to the composite porous structure. The linearised wave theory is adopted to analyse the wave interaction with three different configurations of the composite structures including (a) porous structure and fully extended vertical barrier, (b) porous structure and bottom-standing barrier and (c) porous structure and surface-piercing barrier. The eigenfunction expansion method along with orthogonal mode-coupling relation is adopted to determine the wave reflection and transmission characteristics along with wave force on the porous structure and barrier, and surface deflection in incident and transmitted region. The experimental investigation is performed for the composite breakwater system and the results obtained are compared and validated with the numerical results. The composite breakwater system is studied for various parameters such as relative water depth, porosity of structure and barrier, structural thickness to wavelength ratio, water depth to wavelength ratio and gap between the structure and barrier. Further, the comparative study is performed with the results available in the literatures. The proposed study exhibits an informative result for the wave energy attenuation by the composite breakwater system which can be designed and implemented in coastal and harbour regions for achieving the tranquillity.
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Abbreviations
- \(C_{\text{m}}\) :
-
Coefficient of added mass
- \(C_{\text{f}}\) :
-
Turbulent-resistant coefficient
- \(d\) :
-
Width of the porous structure
- \(\varepsilon_{\text{b}}\) :
-
Porosity of the barrier
- \(\varepsilon_{\text{S}}\) :
-
Porosity of the structure
- \(f_{\text{S}}\) :
-
Resistance coefficient of porous structure
- \(f_{\text{b}}\) :
-
Resistance coefficient of porous barrier
- \(G_{\text{b}}\) :
-
Porous effect parameter of barrier
- \(g\) :
-
Acceleration due to gravity
- \(h\) :
-
Water depth
- \(h_{1}\) :
-
Depth of barrier from mean free surface
- \(i\) :
-
Imaginary number
- \(K_{\text{d}}\) :
-
Energy dissipation coefficient
- \(k_{\text{jn}}\) :
-
Wave number in x-direction
- \(K_{\text{r}}\) :
-
Reflection coefficient
- \(K_{\text{t}}\) :
-
Transmission coefficient
- \(L\) :
-
Wavelength of incident wave
- \(l\) :
-
Wave number in z-direction
- \(N\) :
-
Number of evanescent wave modes
- \(q\) :
-
Instantaneous Eulerian velocity vector
- \(s_{\text{s}}\) :
-
Reactance coefficient of porous structure
- \(s_{\text{b}}\) :
-
Reactance coefficient of porous barrier
- \(V\) :
-
Volume
- \(w\) :
-
Width between the structure and barrier
- \(\omega\) :
-
Wave frequency
- \(\gamma_{\text{jn}}\) :
-
Wave number in y-direction
- \(\theta\) :
-
Incident wave angle
- \(\rho\) :
-
Density of water
- \(\nu\) :
-
Kinematic viscosity
- \(\phi\) :
-
Velocity potential
- \(\Lambda_{\text{p}}\) :
-
Intrinsic permeability
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The authors are thankful to NITK Surathkal and Ministry of Education, New Delhi, for providing financial and necessary support to perform the research work.
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Krishna, K.R.A., Karaseeri, A.G. & Karmakar, D. Oblique wave propagation through composite permeable porous structures. Mar Syst Ocean Technol 17, 164–187 (2023). https://doi.org/10.1007/s40868-022-00122-1
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DOI: https://doi.org/10.1007/s40868-022-00122-1