Vegetation development in river bed and in the banks, may affect the hydraulic conditions and hydrodynamic behavior of a stream. Understanding flow dynamic within vegetation becomes very important to control floods and the stream ecosystem. The present paper explores the capacity of a model in a two-dimensional code Telemac2D, to predict flow characteristics in vegetated open channel. This model adopted a two-layer approach to determine the mean velocity in vegetated flume using vegetation characteristics. The verification of the programmed model capacity was based on comparison between simulations and measured results derived from the experiences of Keramaris Evangelos (2012), Sergio De Felice (2008) and Le Bouteiller and Venditti (2014). These experiments were conducted with submerged vegetation in a rectangular open channel flow to determine the vegetation effects on flow processes. The comparison shows a good agreement between the simulations results and the measured ones in presence of slopes. This programmed model was more accurate in the case of rigid vegetation than flexible vegetation. In general, the new roughness model could be used to predict the effect of vegetation resistance on flow, which is a very important phenomenon to control river floods.


Vegetation, hydraulic, floods, two-dimensional code, open channel

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Augustijn, D.C.M., Huthoff, F., and Van Velzen, E.H. (2008). ” Comparison of vegetation roughness descriptions. Int. Conf. on Fluvial Hydraulics, River flow, Çeşme. Izmir, Turkey, pp.3-8.

Baptist, M.J., Babovic, J.R. Uthurburu, M.Keijzer, R.E. Uittenbogaard, Mynett, A., Verwey, A. “On inducing equations for vegetation resistance,”.J. Hydraul. Res.,vol.45, no. 4, pp.435-45, 2007.

Carollo, F.G., Ferro, V. and Termini, D. (2005). Flow resistance law in channels with flexible submerged vegetation. Journal of Hydraulic research 131, 554-564.

Defina, A., and Bixio, C. (2005). “Mean flow and turbulence in vegetated open channel flow,” Water Resour. Res., vol.7,pp. 1-12.

Huthoff, F., Augustijn, D.C.M. and Hulscher, S. J. M.(2007).“Analytical solution of the depth-averaged flow velocity in case of submerged rigid cylindrical vegetation. Water Resour. Res.,vol. 43, pp.1-10, 2007.

Jarvela, J. (2005). “Effect of submerged flexible vegetation on flow structure and resistance,” J.Hydrol., vol.307, pp: 233-241

Keramaris Evangelos. The Impact of Vegetation on the Characteristics of the Flow in an Inclined Open Channel Using the Piv Method. Water Resources and Ocean Science. Vol. 1, No. 1, 2012, pp. 1-6. doi: 10.11648/j.wors.20120101.11

Klopstra, D., Barneveld, H. J., van Noortwijk, J. M., and Van Velzen, E. H. (1997). “Analytical Model for Hydraulic Roughness of Submerged Vegetation”. In Proc. Managing Water: Coping with Scarcity and Abundance. 27 th IAHR Congress, San Fransisco, New York, 1997, PP. 775-780.

López, F and M.H. García, “ Mean Flow and Turbulence Structure of Open Channel Flow through Non-emergent Vegetation,”J. Hydraul. Eng., vol.127, no.5, pp. 392-402, May.2001

Morri, M. Soualmia, A. and Belleudy, Ph. (2015). “Mean Velocity Modeling of Open-Channel Flow with Submerged Rigid Vegetation,” International Journal of Mechanical, Aerospace, Industrial and Mechatronics Engineering, Vol: 9 no: 2, pp:289-294.

Morri, M., Soualmia, A. and Belleudy, Ph. (2014). ” The Tests of Analytical Models for Prediction the Vertical Velocity Profiles through Submerged Vegetation,” in Conf. 2014. Int. Conf. on Mechanics and Energy, ICME’2014, March 18-20, 2014, Monastir, TUNISIA.

Nepf, H. (2012). Hydrodynamics of vegetated channels. Journal of Hydraulic Research Vol. 50 (3), 262-279.

Nepf, H. et Vivoni, E. R. (2000). Flow structure in depth-limited, vegetated flow, journal of geophysical research, vol. 105, no. c12, pages 28,547-28,557, december 15, 2000

Righetti, M. Armanini,A. 2002. Flow Resistance in Open Channel Flows with Sparsely Distributed Bushes. J. Hydrol., 269: 55–64.

Shimizu,Y. and Tsujimoto, T. 1994. Numerical Analysis of Turbulent Open-channel Flow over a Vegetation Layer Using a k-ε Turbulence Model. J. Hydrosci. Hydraulic.Eng., 11(2): 57-67.

Stone, M.B., and Shen, H.T.(2002). “Hydraulic Resistance of Flow in Channels with Cylindrical Roughness,” J. Hydraul. Eng., vol.128, no.5, pp.500-506.

Tsujimoto, T Okada, T., and Kontani, K,. (1993). “Turbulent structure of open-channel flow over flexible vegetation,” Progressive Report. Hydr. Lab., Kanazawa University, Japon, pp. 37-45, 1993.

Van Velzen, E.H. Jesse, P. Cornelissen, P. and Coops, H. (2003). “Stromingsweerstandvegetatieinuiterwaarden,”; RIZA Reports, Arnhem, Netherlands.

Yang, W., and Choi, S. (2010). “A Two-layer approach for depth-limited open-channel flows with submerged vegetation,” J. Hydraul. Res., vol.48, no. 4, pp. 466-475.


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