Maria Maza, Javier Lara, Barbara Ondiviela, Inigo J. Losada


The correct address of wave characteristics in the vicinity of submerged vegetation is crucial to perform an ecological analysis. Although several attempts have been done in the past using an analytical approach or depth averaged models, the rigidity of the assumptions used to solve the physics produced limited application to real cases. The use of a NS model called IH-2VOF is used first to minimize the number of predefined assumptions for wave propagation and the non-linear interactions between waves and plants and second to explore the possibility to improve existing turbulence models to consider wave interaction with vegetation. The IH2-VOF model has been validated using large scale experiments developed by Stratigaki et al. (2011). The model has shown a high degree of accordance between the lab data and the numerical predictions in free surface evolution. Numerical predictions of the velocity field have been compared both over and inside the vegetation showing also a high degree of accordance. Drag coefficients obtained during the model calibration are in accordance with previous studies such as Mendez et al. (1999). The influence of wave height, wave period, water depth and patch density have been studied using additional numerical simulations with irregular waves. Both the wave period and the water depth have been revealed as the most important parameters in the modification of the flow patterns around the patch.


seagrass; Navier-Stokes modeling; wave plant interaction; drag coefficient

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Asano, T., Tsutsui, S., and Sakai, T. 1988. Wave damping characteristics due to seaweed, Procceedings of 25th Coastal Engineering Conference in Japan, 138-142.

Augustin, L.N., Irish, J.L., and Lynett, P. 2009. Laboratory and numerical studies of wave damping by emergent and near emergent wetland vegetation, Coastal Engineering, 56, 332-340.http://dx.doi.org/10.1016/j.coastaleng.2008.09.004

Dalrymple, R.A., Kirby, J.T., and Hwang, P.A. 1984. Wave Diffraction Due to Areas of Energy Dissipation, Coastal and Ocean Engineering. J. Wtrwy., Port, Vol. 110, Issue 1, pp. 67-79.

De Boer, W.F. 2007. Seagrass–sediment interactions, positive feedbacks and critical thresholds for occurrence: a review. Hydrobiologia, 591: 5-24.http://dx.doi.org/10.1007/s10750-007-0780-9

Hiraoka, H., Ohashi, M. (2006). "A (k-ε) turbulence closure model for plant canopy flows". Proc. of 4th International Symposium on Computational Wind Engineering (CWE2006) in Yokohama.

Kobayashi, N., Raichlen, A.W., and Asano T. (1993). Wave Attenuation by Vegetation, Coastal and Ocean Engineering, J. Wtrwy., Port Vol. 119, 30-48.

Lara, J.L., Ruju, A., and Losada, I.J. 2011. Reynolds averaged Navier–Stokes modelling of long waves induced by a transient wave group on a beach, Proceedings of the royal society A. 467: 1215-1242.http://dx.doi.org/10.1098/rspa.2010.0331

Losada, I.J., Lara, J.L., Guanche, R., Gonzalez-Ondina, J.M. (2008). "Numerical analysis of wave overtopping of rubble mound breakwaters", Coastal Engineering, ELSEVIER. 55 (1), 47–62.http://dx.doi.org/10.1016/j.coastaleng.2007.06.003

Lowe, R.J., Koseff, J.R., Monismith, S.G. (2005). "Oscillatory flow through submerged canopies. Part 1. Velocity structure", J. of Geophysical Research. 110, doi: 10.1029/2004JC002788.http://dx.doi.org/10.1029/2004JC002788

Luhar, M., Coutu, S., Infantes, E., Fox, S. and Nepf, H. (2010). "Wave-induced velocities inside a model seagrass bed". J. of Geophysical Research, vol. 115, C12005.http://dx.doi.org/10.1029/2010JC006345

Mendez F.J. and Losada I.J., (1999). "Hydrodynamics induced by wind waves in a vegetation field", J. of Geophysical Research, vol. 104, C8, 18383-18396http://dx.doi.org/10.1029/1999JC900119

Stratigaki, V., Manca, E., Prinos, P., Losada, I.J., Lara, J.L., Sclavo, M., Amos, C.L., Caceres, I., Sanchez-Arcilla, A. (2011). Large scale experiments on wave propagation over Posidonia Oceanica. Journal of Hydraulic Research, IAHR, Vol. 49, Supplement 1, 31-43.http://dx.doi.org/10.1080/00221686.2011.583388

DOI: https://doi.org/10.9753/icce.v33.management.62