Investigating Effect of Changing Vegetation Height with Irregular Layout on Reduction of Waves using Flow-3D Numerical Model

Document Type : Original Article

Authors

1 Graduated from Offshore Structures, Department of Offshore Structures, Faculty of Marine Engineering, Khorramshahr University of Marine Science and Technology, Iran.

2 Associate Professor in Department of Marine Structures, Khorramshahr University of Marine Science and Technology, Iran.

Abstract

In this study, the effect of changing vegetation heights with regular arrangement on wave reduction is investigated using numerical model Flow 3D. For this purpose, a model of a channel with a specific dimension is simulated, and the three-layered arrangement of the layout Long-short, short-to-long, and zigzag layouts under four different waves, all of which are linear waveforms. The results obtained from wave height measurements at four different points along the canal indicate that the behavior of waves in dealing with different layers follows a steady pattern, and the change in vegetation geometry can greatly lead to Increase in damping waves.From this research, it can be concluded that in order to achieve maximum damping in vegetation with variable height, it is necessary that the maximum level of lateral obstruction is at the beginning of the cover, and in the face of maximum wave energy. His research by Cheng Wu and Daniel T. Cox (2015) shows that by managing the level of lateral inhibition by changing the density or changing the geometry of the coating, other parameters effective in damping the waves in plant coatings can be fixed. It greatly increased the damping.

Keywords


Asano, T., 1988. Wave damping characteristics due to seaweed, Proc. 35th Conf. on Coastal Engrg., 1988.
Asano, T., Deguchi, H., and Kobayashi, N., 1992. Interaction between water waves and vegetation, Coastal Engineering 1992, pp. 2709-2723.
Best, Ü.S., van der Wegen, M., Dijkstra, J., Reyns, J., van Prooijen, B.C., and Roelvink, D., 2022. Wave attenuation potential, sediment properties and mangrove growth dynamics data over Guyana's intertidal mudflats: assessing the potential of mangrove restoration works. Earth System Science Data, 14(5), pp. 2445-2462.
Cooper, N.J., 2005. Wave dissipation across intertidal surfaces in the Wash tidal inlet, eastern England. Journal of Coastal Research, 21(1), pp. 28-40.
Dean, R., 1979. Effects of vegetation on shoreline erosional processes. p. 416–426. R E. Greeson, J, R, Clark, and J, 1(2).
Dean, R.G., and Dalrymple, R.A., 1991. Water wave mechanics for engineers and scientists, 2. world scientific publishing company.
Dubi, A., 1995. Damping of water waves by submerged vegetation–a case study on Laminaria hyperborea. Dr. Ing, Thesis, Department of Structural Engineering, NTNU/SINTEF-NHL, N-7034 Trondheim, Norway., Institute: Universitetet i Trondheim (Norway) Publisher.
Erduran, K., and Kutija, V., 2003. Quasi-three-dimensional numerical model for flow through flexible, rigid, submerged and non-submerged vegetation. Journal of Hydroinformatics, 5(3), pp. 189-202.
Fathi-Moghadam, M., Kashefipour, M., Ebrahimi, N., and Emamgholizadeh, S., 2011. Physical and numerical modeling of submerged vegetation roughness in rivers and flood plains. Journal of Hydrologic Engineering, 16(11), pp. 858-864.
Hu, Z., Lian, S., Zitman, T., Wang, H., He, Z., Wei, H., Ren, L., Uijttewaal, W., and Suzuki, T., 2022. Wave breaking induced by opposing currents in submerged vegetation canopies. Water Resources Research, 58(4), pp. e2021WR031121.
Imamura, M. et al., 2006. Current status of hematopoietic cell transplantation for adult patients with hematologic diseases and solid tumors in Japan. International journal of hematology, 83, pp. 164-178.
Li, R.-M., and Shen, H.W., 1973. Effect of tall vegetations on flow and sediment. Journal of the hydraulics division, 99(5), pp. 793-814.
Ma, Y. et al., 2023. Wave attenuation by flattened vegetation (Scirpus mariqueter). Frontiers in Marine Science, 10, pp. 571.
Mukherjee, A., Cajas, J.C., Houzeaux, G., Lehmkuhl, O., Suckale, J., and Marras, S., 2023. Forest density is more effective than tree rigidity at reducing the onshore energy flux of tsunamis. Coastal Engineering, 182, pp. 104286.
Shih, R.-S., Li, C.-Y., Weng, W.-K., and Lin, C.-H., 2022. Relative Energy Variation Characteristics Considering Interaction between Waves and Vegetation Structure. Water, 14(16), pp. 2567.
Tavakoli, S., Shaghaghi, P., Mancini, S., De Luca, F., and Dashtimanesh, A., 2022. Wake waves of a planing boat: An experimental model. Physics of Fluids, 34(3), pp. 037104.
van Wesenbeeck, B.K., Wolters, G., Antolínez, J.A., Kalloe, S.A., Hofland, B., de Boer, W.P., Çete, C., and Bouma, T.J., 2022. Wave attenuation through forests under extreme conditions. Sci Rep, 12(1), pp. 1884.
Wu, W.-C., and Cox, D.T., 2016. Effects of vertical variation in vegetation density on wave attenuation. Journal of Waterway, Port, Coastal, and Ocean Engineering, 142(2), pp. 04015020.
Zhang, X., Lin, P., and Nepf, H., 2022. A wave damping model for flexible marsh plants with leaves considering linear to weakly nonlinear wave conditions. Coastal Engineering, 175, pp. 104124.