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Numerical Investigation of Wave Interaction with Double Vertical Slotted Walls

Authors: H. Ahmed, A. Schlenkhoff

Abstract:

Recently, permeable breakwaters have been suggested to overcome the disadvantages of fully protection breakwaters. These protection structures have minor impacts on the coastal environment and neighboring beaches where they provide a more economical protection from waves and currents. For regular waves, a numerical model is used (FLOW-3D, VOF) to investigate the hydraulic performance of a permeable breakwater. The model of permeable breakwater consists of a pair of identical vertical slotted walls with an impermeable upper and lower part, where the draft is a decimal multiple of the total depth. The middle part is permeable with a porosity of 50%. The second barrier is located at distant of 0.5 and 1.5 of the water depth from the first one. The numerical model is validated by comparisons with previous laboratory data and semi-analytical results of the same model. A good agreement between the numerical results and both laboratory data and semi-analytical results has been shown and the results indicate the applicability of the numerical model to reproduce most of the important features of the interaction. Through the numerical investigation, the friction factor of the model is carefully discussed.

Keywords: Coastal structures, permeable breakwater, slotted wall, numerical model, energy dissipation coefficient.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1094441

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References:


[1] R. G. Abul-Azm, "Wave diffraction through submerged breakwaters,” J. of Waterway, Port, Coastal and Ocean Eng., vol. 119, no.6, pp.587-605, 1993.
[2] H. G. Ahmed, A. Schlenkhoff, and D. Bung, „Hydrodynamic characteristics of vertical slotted wall breakwaters,” In Proc. Of the 34th IAHR World Congress, Brisbane, Australia.pu, 2011.
[3] H. G. Ahmed, A. Schlenkhoff, and M. Oertel, „Stokes second-order wave interaction with vertical slotted wall breakwater,” Coastal Structures Conference, Yokohama, Japan, 2011.
[4] H. G. Ahmed, "Wave Interaction with Vertical Slotted Walls as a Permeable Breakwater,” PhD. Thesis, Hydro Sciences (IGAW), Bergische University of Wuppertal, Germany, 2011.
[5] C. W. Hirt, and B. D. Nichols, "Volume of Fluid (VOF) method for the dynamics of free boundaries,” J. Computat. Phys., vol. 39, no. 1, pp. 201-225, 1981.
[6] C. J. Huang, H. H. Chang, and H. H. Hwung, "Structural permeability effects on the interaction of a solitary wave and a submerged breakwater,” Coastal Engineering. Vol. 49, pp. 1-24, 2003.
[7] M. Isaacson, S. Premasiri, and G. Yang, "Wave interaction with vertical slotted barrier,” J. of Waterway, Port, Coastal and Ocean Engineering, vol. 124, no. 3, pp. 118-125, 1998.
[8] M. Isaacson, J. Baldwin, S. Premasiri, and G. Yang, "Wave interaction with double slotted barrier,”Applied ocean research, Vol. 21, pp. 81-91, 1999.
[9] M. F. Karim, K. Tanimoto, and P. D. Hieu, "Modelling and simulation of wave transformation in porous structures using VOF based two-phase flow model,” Applied Mathematical Modelling. vol. 33, pp. 343–360, 2009.
[10] A. S. Koraim, E. M. Heikal, O. S. Rageh, „Hydrodynamic characteristics of double permeable breakwater under regular waves,” Coastal Engineering, vol. 24, pp. pp.503–527, 2011.
[11] A. S. Koraim, M. M. Iskander, and W. R. Elsayed, "Hydrodynamic performance of double rows of piles suspending horizontal c shaped bars,” Coastal Eng., vol. 84, pp. 81–96, 2014.
[12] K. Laju, V. Sundar, and R. Sundaravadivelu, "Studies on Pile supported double skirt breakwater models,” J. of Ocean Technology, vol. 2, no. 1. pp. 32-53, 2007.
[13] J.L. Lara, N. Garcia, and I.J. Losada, "RANS modelling applied to random wave interaction with submerged permeable structures,” Coastal Engineering, vol. 53, pp. 395–417, 2006.
[14] J.L. Lara, I.J. Losada, and R.Guanche, "Wave interaction with low-mound breakwaters using a RANS model,” Ocean Engineering, vol. 35, pp. 1388– 1400, 2008.
[15] P.L.-F. Liu, M., Abbaspour, "Wave scattering by a rigid thin barrier,” J. of Waterway, Port, Coastal and Ocean Eng. Div. ASCE, vol. 108, no. 4, pp. 479-491. 1982.
[16] P. Lin, and S.A.S.A. Karunarathna, "Numerical study of solitary wave interaction with porous breakwaters,” J. of waterway, port, coastal and ocean engineering. , pp. 352-363, Sep/Oct, 2007.
[17] E .P. D. Mansard, and E. R Funke, "The measurement of incident and reflected spectra using a least squares method,” In Proc. 17th Coastal Eng. Conf., Sydney, Australia, pp. 159-174, 1980.
[18] O.S. Rageh, A.S. Koraim, "Hydraulic performance of vertical walls with horizontal slots used as breakwater,” Coastal Engineering , vol. 57, pp. 745–756, 2010.
[19] A. Schlenkhoff,; M. Oertel, and H. G. Ahmed, "Numericalsimulation of hydrodynamic performance of a permeable breakwater,” 8th International Conf. on Coastal and Port Eng. in Developing Countries, IIT Madras, Chennai, India, 2012.
[20] C. K. Sollit, and R.H. Cross, "Wave transmission through permeable breakwaters,” Proceedings of the 13th Coastal Eng. Conf., ASCE, Vancouver, pp. 1827-1846. 1972.
[21] K. D. Suh, S. Shin, and D. T. Cox, "Hydrodynamic characteristics of pile-Supported vertical wall breakwaters,” J. Waterways, Port, Coastal and Ocean Engineering, vol.132, no.2, pp.83-96. 2006.
[22] K. D. Suh, H. Y. Jung, and C. K. Pyun, "Wave reflection and transmission by Curtainwall-Pile breakwaters using circular piles,” J. of waterways, Port, Coastal and Ocean Eng., vol.34, issues 14-15, pp. 2100-2106, 2007.
[23] V. Sundar, and B. V. V. Subbarao, "Hydrodynamic performance characteristics of Quadrant front face Pile supported Breakwater.” J. waterways, Port, Coastal and Ocean Engineering, vol.129, no.1, pp. 22-33, 2003.
[24] X. Yu, "Diffraction of water waves by porous breakwater,” J. of Waterway, Port, Coastal and Ocean Engineering, vol. 121, no. 6, pp. 275-282, 1995.