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Abstract
This work presents an experimental study of long-period waves passing over modelled vegetation belts, focusing on the energy attenuation process through vegetation belts and their characteristics. The wave passing over a slope and interacting with vegetation has complex flow characteristics. Thus, the process of energy attenuation by the vegetation has been investigated in this study. Monochromatic waves were considered, and the attenuation characteristics over vegetation belts of different lengths have been discussed in detail. The wave characteristics were discussed in the spectral domain considering the primary frequency and higher harmonics of incident waves to understand the attenuation process of vegetation. The attenuation by vegetation consists of shifting of energy from primary frequencies to higher harmonics and the dissipation of energy from the higher harmonics. The importance of vegetation belt length in energy attenuation has been proved through this investigation in detail.References
Anderson, M.E. and Smith, J.M., 2014. Wave attenuation by flexible, idealized salt marsh vegetation. Coastal Engineering, 83, pp.82-92.
Barbier, E.B., Georgiou, I.Y., Enchelmeyer, B. and Reed, D.J., 2013. The value of wetlands in protecting southeast Louisiana from hurricane storm surges. PloS one, 8(3), p.e58715.
Bianchi, T.S., Allison, M.A., Zhao, J., Li, X., Comeaux, R.S., Feagin, R.A. and Kulawardhana, R.W., 2013. Historical reconstruction of mangrove expansion in the Gulf of Mexico: linking climate change with carbon sequestration in coastal wetlands. Estuarine, Coastal and Shelf Science, 119, pp.7-16.
Dalrymple, R.A., Kirby, J.T. and Hwang, P.A., 1984. Wave diffraction due to areas of energy dissipation. Journal of waterway, port, coastal, and ocean engineering, 110(1), pp.67-79.
Danielsen, F., Sørensen, M.K., Olwig, M.F., Selvam, V., Parish, F., Burgess, N.D., Hiraishi, T., Karunagaran, V.M., Rasmussen, M.S., Hansen, L.B. and Quarto, A., 2005. The Asian tsunami: a protective role for coastal vegetation. Science, 310(5748), pp.643-643.
Hari Ram, N., Sriram, V. and Murali, K., 2022. Experimental investigation on the characteristics of solitary and elongated solitary waves passing over vegetation belt. Journal of Ocean Engineering and Marine Energy, 8(3), pp.305-318.
Hashim, A.M. and Catherine, S.M.P., 2013. A laboratory study on wave reduction by mangrove forests. APCBEE procedia, 5, pp.27-32.
He, F., Chen, J. and Jiang, C., 2019. Surface wave attenuation by vegetation with the stem, root and canopy. Coastal Engineering, 152, p.103509.
Jadhav, R.S., Chen, Q. and Smith, J.M., 2013. Spectral distribution of wave energy dissipation by salt marsh vegetation. Coastal Engineering, 77, pp.99-107.
Kathiresan, K. and Rajendran, N., 2005. Coastal mangrove forests mitigated tsunami. Estuarine, Coastal and shelf science, 65(3), pp.601-606.
Lee, W.K., Tay, S.H., Ooi, S.K. and Friess, D.A., 2021. Potential short wave attenuation function of disturbed mangroves. Estuarine, Coastal and Shelf Science, 248, p.106747.
Magdalena, I., Andadari, G.R. and Reeve, D.E., 2022. An integrated study of wave attenuation by vegetation. Wave Motion, 110, p.102878.
Mascarenhas, A. and Jayakumar, S., 2008. An environmental perspective of the post-tsunami scenario along the coast of Tamil Nadu, India: Role of sand dunes and forests. Journal of Environmental Management, 89(1), pp.24-34.
Maza, M., Lara, J.L. and Losada, I.J., 2016. Solitary wave attenuation by vegetation patches. Advances in Water Resources, 98, pp.159-172.
Mendez, F.J. and Losada, I.J., 2004. An empirical model to estimate the propagation of random breaking and nonbreaking waves over vegetation fields. Coastal Engineering, 51(2), pp.103-118.
Montakhab, A., Yusuf, B., Ghazali, A.H. and Mohamed, T.A., 2012. Flow and sediment transport in vegetated waterways: a review. Reviews in Environmental Science and Bio/Technology, 11, pp.275-287.
Nepf, H.M., 1999. Drag, turbulence, and diffusion in flow through emergent vegetation. Water resources research, 35(2), pp.479-489.
Noarayanan, L., Murali, K. and Sundar, V., 2012. Performance of flexible emergent vegetation in staggered configuration as a mitigation measure for extreme coastal disasters. Natural hazards, 62, pp.531-550.
Phan, K.L., Stive, M.J.F., Zijlema, M., Truong, H.S. and Aarninkhof, S.G.J., 2019. The effects of wave non-linearity on wave attenuation by vegetation. Coastal Engineering, 147, pp.63-74.
Sundar, V., Sannasiraj, S.A., Murali, K. and Sundaravadivelu, R., 2007. Runup and inundation along the Indian peninsula, including the Andaman Islands, due to Great Indian Ocean Tsunami. Journal of waterway, port, coastal, and ocean engineering, 133(6), pp.401-413.
Tanaka, N., 2009. Vegetation bioshields for tsunami mitigation: review of effectiveness, limitations, construction, and sustainable management. Landscape and Ecological Engineering, 5, pp.71-79.
Thampanya, U., Vermaat, J.E., Sinsakul, S. and Panapitukkul, N., 2006. Coastal erosion and mangrove progradation of Southern Thailand. Estuarine, coastal and shelf science, 68(1-2), pp.75-85.
Ward, R.D., 2020. Carbon sequestration and storage in Norwegian Arctic coastal wetlands: Impacts of climate change. Science of the Total Environment, 748, p.141343.
Wu, W.C., Ma, G. and Cox, D.T., 2016. Modeling wave attenuation induced by the vertical density variations of vegetation. Coastal Engineering, 112, pp.17-27.
Zhao, C., Tang, J. and Shen, Y., 2021. Experimental study on solitary wave attenuation by emerged vegetation in currents. Ocean Engineering, 220, p.108414.
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