Numerical and Experimental Study on the Wave-Attenuation Effect According to the Height of a Two-Row Submerged Rectangular Structure
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Coastal erosion, exacerbated by climate change and coastal development, presents increasing challenges for shoreline protection. This study investigates the effectiveness of submerged structures, specifically underwater breakwaters, in mitigating wave energy while supporting coastal ecosystems. The reflection and transmission coefficients of a two-row submerged rectangular structure at various heights were evaluated. Numerical simulations utilized the boundary element method (BEM) for potential flow analysis and computational fluid dynamics (CFD) for viscous flow assessment. Experimental validation was conducted in a two-dimensional wave tank at Inha University, measuring wave heights before and after interaction with the submerged structures. Results revealed that increasing structure height led to higher reflection coefficients and lower transmission coefficients. When the front structure was higher, the dissipation coefficient reached a maximum of 0.17. Maximum reflection and minimum transmission coefficients were observed under Bragg reflection conditions when the spacing matched half the incident wavelength. Discrepancies between CFD and BEM results were attributed to fluid viscosity effects. These findings underscore the potential of submerged structures to enhance wave attenuation, demonstrating that carefully optimized designs can significantly improve coastal protection.
Abstract
Coastal erosion, exacerbated by climate change and coastal development, presents increasing challenges for shoreline protection. This study investigates the effectiveness of submerged structures, specifically underwater breakwaters, in mitigating wave energy while supporting coastal ecosystems. The reflection and transmission coefficients of a two-row submerged rectangular structure at various heights were evaluated. Numerical simulations utilized the boundary element method (BEM) for potential flow analysis and computational fluid dynamics (CFD) for viscous flow assessment. Experimental validation was conducted in a two-dimensional wave tank at Inha University, measuring wave heights before and after interaction with the submerged structures. Results revealed that increasing structure height led to higher reflection coefficients and lower transmission coefficients. When the front structure was higher, the dissipation coefficient reached a maximum of 0.17. Maximum reflection and minimum transmission coefficients were observed under Bragg reflection conditions when the spacing matched half the incident wavelength. Discrepancies between CFD and BEM results were attributed to fluid viscosity effects. These findings underscore the potential of submerged structures to enhance wave attenuation, demonstrating that carefully optimized designs can significantly improve coastal protection.
참고문헌 (13)
- Cao, Y., "Wave attenuation properties of double trapezoidal submerged breakwaters on flat-bed", Transactions of Tianjin University, 18, pp.401~410 (2012)[DOI]
- Cho, Y. S., "Analysis of Bragg Reflection of Waves due to Rectangular Impermeable Submerged Breakwaters with Two-Dimensional Finite Element Method", Journal of Korea Water Resources Association, 36(3), pp.447~454 (2003)[DOI]
- Gunawardane, S. D. G. S. P., "Hydrodynamics of top hinged OWSC wave energy device the"Pendulor"with a bottom gap", Journal of Advanced Marine Engineering and Technology, 44(1), pp.75~81 (2020)[DOI]
- Heo, S., "Optimization Analysis of the Shape and Position of a Submerged Breakwater for Improving Floating Body Stability", Journal of Ocean Engineering and Technology, 38(2), pp.53~63 (2024)[DOI]
- Hsu, T. W., "Using RANS to simulate vortex generation and dissipation around impermeable submerged double breakwaters", Coastal Engineering, 51(6), pp.557~579 (2004)[DOI]
- Hur, D. S., "Numerical simulation of velocity fields and vertex generation around the submerged breakwater on the sloped bottom", Journal of Korean Society of Coastal and Ocean Engineers, 15(3), pp.151~158 (2003)
- Jung, H., "An experimental study on wave absorber performance of combined punching plate in a two-dimensional mini wave tank", Journal of Ocean Engineering and Technology, 35(2), pp.113~120 (2021)[DOI]
- Katsidoniotaki, E., "Numerical modeling of extreme waveinteraction with point-absorber using OpenFOAM", Ocean Engineering, 245, pp.110268~ (2022)[DOI]
- Koley, S., "Numerical and experimental modeling of water wave interaction with rubble mound offshore porous breakwaters", Ocean Engineering, 218, pp.108218~ (2020)[DOI]
- Lee, J. I., "Laboratory Experiments on Reflection of Regular Waves due to Submerged Breakwaters", Journal of Korean Society of Coastal and Ocean Engineers, 15(3), pp.167~175 (2003)
- Rahman, M. A., "Experimental and numerical investigation on wave interaction with submerged breakwater", Journal of Water Resources and Ocean Science, 2(6), pp.155~164 (2013)[DOI]
- Suh, K. D., "Separation of incident and reflected waves in wave–current flumes", Coastal Engineering, 43(3-4), pp.149~159 (2001)[DOI]
- Vijay, K. G., "Bragg scattering of surface gravity waves by an array of submerged breakwaters and a floating dock", Wave Motion, 106, pp.102807~ (2021)[DOI]