Abstract
Coastal vegetation is a soft solution for protecting the coast from the action of waves by attenuating the wave height and reducing the energy of the waves. Effect of wave height attenuation as a result of the presence of emerged coastal vegetation is studied numerically by resolving the Reynolds-averaged Navier–Stokes (RANS) equations. A three-dimensional numerical wave tank model is simulated using an open source computational fluid dynamics (CFD) software REEF3D, and wave attenuation due to emerged coastal vegetation is determined. An artificial, rigid, emerged vegetation for a length of 2 m is developed in a numerical wave tank of REEF3D. The model is tested for regular waves of height 0.08, 0.12, and 0.16 m and wave periods of 1.8 and 2 s in a water depth of 0.40 and 0.45 m. The wave heights are measured at different locations along the vegetation meadow at 0.5 m intervals. The devolved numerical model is corroborated by comparing the obtained numerical results with the experimental results as reported by John et al. (Experimental investigation of wave attenuation through artificial vegetation meadow, ISH—HYDRO, [1]). The numerically obtained results are concurrent with the experimental results.
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Acknowledgements
The authors are grateful to Dr. Kiran G. Shirlal, professor, Department of Applied Mechanics and Hydraulics, Dr. Subba Rao, professor, Department of Applied Mechanics and Hydraulics, Beena Mary John, research scholar, and authorities of Department of Applied Mechanics and Hydraulics and Centre for System Design (CSD), NITK Surathkal, for providing the experimental data and computational resource for the study.
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Arunakumar, H.S., Suvarna, P., Abhijith, P.A., Prabhu, A.S., Pruthviraj, U., Kamath, A. (2019). Effect of Emerged Coastal Vegetation on Wave Attenuation Using Open Source CFD Tool: REEF3D. In: Murali, K., Sriram, V., Samad, A., Saha, N. (eds) Proceedings of the Fourth International Conference in Ocean Engineering (ICOE2018). Lecture Notes in Civil Engineering, vol 22. Springer, Singapore. https://doi.org/10.1007/978-981-13-3119-0_37
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