Abstract
Vegetation is of great significance in river ecosystems in terms of hydrodynamics, water environment and ecology. The question of how to predict the bulk velocity in channel flow through submerged vegetation is currently a hot topic in hydraulics research. The present study addresses this question. The various formulae used for bulk velocity estimation in previous work were reviewed and compared. The main novelty of this paper is that a new expression of friction factor is proposed as a function of two dimensionless factors, and the number of tuning parameters is less than that in previous work. A comparison of measured and calculated data was conducted for flow through submerged rigid and flexible vegetation. The comparison showed that the proposed new model can make more accurate predictions than previous models. It is envisaged that the proposed formulation can be usefully employed in eco-hydraulics predictions.
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References
Chen Z., Jiang C., Nepf H. Flow adjustment at the leading edge of a submerged aquatic canopy [J]. Water Resources Research, 2013, 49(9): 5537–5551.
Chen Z., Ortiz A., Zong L. et al. The wake structure behind a porous obstruction and its implications for deposition near a finite patch of emergent vegetation [J]. Water Resources Research, 2012, 48(9): W09517.
Huai W., Xue W., Qian Z. Large-eddy simulation of turbulent rectangular open-channel flow with an emergent rigid vegetation patch [J]. Advances in Water Resources, 2015, 80: 30–42.
Kim H. S., Kimura I., Park M. Numerical simulation of flow and suspended sediment deposition within and around a circular patch of vegetation on a rigid bed [J]. Water Resources Research, 2018, 54(10): 7231–7251.
Li W. Q., Wang D., Jiao J. L. et al. Effects of vegetation patch density on flow velocity characteristics in an open channel [J]. Journal of Hydrodynamics, 2019, 31(5): 1052–1059.
Melis M., Poggi D., Oscar Domenico F. G. et al. Resistance to flow on a sloping channel covered by dense vegetation following a dam break [J]. Water Resources Research, 2019, 55(2): 1040–1058.
Wang W. J., Huai W. X., Zeng Y. H. et al. Analytical solution of velocity distribution for flow through submerged large deflection flexible vegetation [J]. Applied Mathematics and Mechanics (English Edition), 2015, 36(1): 107–120.
Cheng N. S. Single-layer model for average flow velocity with submerged rigid cylinders [J]. Journal of Hydraulic Engineering, 2015, 141(10): 06015012.
Huai W., Wang W., Hu Y. et al. Analytical model of the mean velocity distribution in an open channel with double-layered rigid vegetation [J]. Advances in Water Resources, 2014, 69: 106–113.
Huai W. X., Zeng Y. H. Xu Z. G. et al. Three-layer model for vertical velocity distribution in open channel flow with submerged rigid vegetation [J]. Advances in Water Resources, 2009, 32(4): 487–492.
Wang P., Chen G. Q. Environmental dispersion in a tidal wetland with sorption by vegetation [J]. Communications in Nonlinear Science and Numerical Simulation, 2015, 22(1–3): 348–366.
Wang W. J., Huai W. X., Li S. et al. Analytical solutions of velocity profile in flow through submerged vegetation with variable frontal width [J]. Journal of Hydrology, 2019, 578: 124088.
Yang W., Choi S. U. A two-layer approach for depth-limited open-channel flows with submerged vegetation [J]. Journal of Hydraulic Research, 2010, 48(4): 466–475.
Stone B. M., Shen H. T. Hydraulic resistance of flow in channels with cylindrical roughness [J]. Journal of Hydraulic Engineering, ASCE, 2002, 128(5): 500–506.
Baptist M., Babovic V., Rodríguez Uthurburu J. et al. On inducing equations for vegetation resistance [J]. Journal of Hydraulic Research, 2007, 45(4): 435–450.
Katul G. G., Poggi D., Ridolfi L. A flow resistance model for assessing the impact of vegetation on flood routing mechanics [J]. Water Resources Research, 2011, 47(8): 427–438.
Wang W. J., Peng W. Q., Huai W. X. et al. Roughness height of submerged vegetation in flow based on spatial structure [J]. Journal of Hydrodynamics, 2018, 30(4): 754–757.
Wang W. J., Peng W. Q., Huai W. X. et al. Friction factor for turbulent open channel flow covered by vegetation [J]. Scientific Reports, 2019, 9(1): 5178.
Acknowledgements
This work was supported by the National Water Pollution Control and Treatment Science and Technology Major Project of China (Grant No. 2018ZX07105-002), the IWHR Research and Development Support Program (Grant Nos. WE0145B062019, WE0145B422019 and WE0145B382019) and the National Key Research and Development Project (Grant No. 2018YFC0407702).
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Project supported by the National Key Research and Development Program of China (Grant No. 2019YFD1100205), the National Natural Science Foundation of China (Grant Nos. 51809286, 51809288).
Biography: Wei-jie Wang (1988-), Male, Ph. D., Senior Engineer
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Wang, Wj., Cui, Xy., Dong, F. et al. Predictions of bulk velocity for open channel flow through submerged vegetation. J Hydrodyn 32, 795–799 (2020). https://doi.org/10.1007/s42241-020-0040-2
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DOI: https://doi.org/10.1007/s42241-020-0040-2