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Flow through layered vegetation in open channel flows: effect on velocity and discharge distribution

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Abstract

In natural river systems, layered vegetation like grass, shrubs, and tall bushes greatly affects the biodiversity, morphological process, and distribution of nutrients and pollutants. Previously, the effects of uniform one-layered vegetation on the flow structure and hydrodynamics have been extensively studied. However, due to the complexity of flow dynamics in the vegetated channel, multiple-layered vegetation has rarely been investigated. This paper presents a novel experiment to show the effect of three-layered vegetation on open channel flow. It contributes to our understanding of the impact of vegetation locations and heights on the velocity and discharge distributions for a mixed vegetated channel flow. Velocities at different positions along a half cross-section were measured using a mini propeller velocimetry. Observed results showed that the velocity has a distinct profile directly behind vegetation and behind the vegetation gap. The overall trend has two specific inflections about one quarter below (0.75 z/h) or near the top of short vegetation (h): the velocity remains nearly constant in the bottom layer (z/h < 0.75) and then rapidly increases until the top of short vegetation; after a gradual increase, the velocity rapidly rises to the water surface. The velocities directly behind the vegetation in the middle-after-short vegetation arrangement increase much faster than those directly behind the vegetation in the short-after-tall arrangement. The results showed that the maximum zonal discharge for a channel with mixed-height vegetation is situated at the mid-section of each half-channel, i.e., the area from 1/6 to 1/3 width of channel away from the wall. This research will attain significant importance to the engineers and practitioners defining the ecological and riverine flow pattern in the presence of riparian vegetation disseminating nutrients, pollutants, and sediments.

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References

  1. Abernethy B, Rutherfurd ID (2001) The distribution and strength of riparian tree roots in relation to riverbank reinforcement. Hydrol Process 15(1):63–79

    Article  Google Scholar 

  2. Scheumann W, Sagsen I, Tereci E (2011) Orontes River Basin: Downstream challenges and prospects for cooperation. Turkey's Water Policy: National Frameworks and International Cooperation, 2011: p. 301–312

  3. Armanini A, Cavedon V (2019) Bed-load through emergent vegetation. Adv Water Resour 129:250–259

    Article  Google Scholar 

  4. Box W, Järvelä J, Västilä K (2021) Flow resistance of floodplain vegetation mixtures for modelling river flows. J Hydrol 601:126593

    Article  Google Scholar 

  5. Shi H, Liang X, Huai W, Wang Y (2019) Predicting the bulk average velocity of open-channel flow with submerged rigid vegetation. J Hydrol 572:213–225

    Article  Google Scholar 

  6. Rowiński PM, Västilä K, Aberle J, Järvelä J, Kalinowska MB (2018) How vegetation can aid in coping with river management challenges: a brief review. Ecohydrol Hydrobiol 18(4):345–354

    Article  Google Scholar 

  7. Naiman RJ, Decamps H, Pollock M (1993) The role of riparian corridors in maintaining regional biodiversity. Ecol Appl 3(2):209–212

    Article  Google Scholar 

  8. Wang C, Zheng S-S, Wang P-F, Hou J (2015) Interactions between vegetation, water flow and sediment transport: a review. J Hydrodyn 27(1):24–37

    Article  Google Scholar 

  9. Nepf HM (2012) Flow and transport in regions with aquatic vegetation. Annu Rev Fluid Mech 44:123–142

    Article  Google Scholar 

  10. Tang C, Yi Y, Zhang S (2023) Flow and turbulence in unevenly obstructed channels with rigid and flexible vegetation. J Environ Manage 326:116736

    Article  Google Scholar 

  11. Nezu I, Sanjou M (2008) Turburence structure and coherent motion in vegetated canopy open-channel flows. J Hydro-environ Res 2(2):62–90

    Article  Google Scholar 

  12. Ghisalberti M, Nepf HM (2002) Mixing layers and coherent structures in vegetated aquatic flows. J Geophys Res Oceans 107(C2):3-1–3-11

    Article  Google Scholar 

  13. Caroppi G, Gualtieri P, Fontana N, Giugni M (2020) Effects of vegetation density on shear layer in partly vegetated channels. J Hydro-Environ Res 30:82–90

    Article  Google Scholar 

  14. Raupach MR, Finnigan JJ, Brunet Y (1996) Coherent eddies and turbulence in vegetation canopies: the mixing-layer analogy. Boundary-Layer Meteorology 25th Anniversary Volume, 1970–1995: Invited Reviews and Selected Contributions to Recognise Ted Munn’s Contribution as Editor over the Past 25 Years, p 351–382

  15. Liu D, Diplas P, Fairbanks J, Hodges C (2008) An experimental study of flow through rigid vegetation. J Geophys Res Earth Surface. https://doi.org/10.1029/2008JF001042

    Article  Google Scholar 

  16. Liu D, Diplas P, Hodges C, Fairbanks J (2010) Hydrodynamics of flow through double layer rigid vegetation. Geomorphology 116(3–4):286–296

    Article  Google Scholar 

  17. Guan Y, Tang X, Zhang Y (2021) The Impact of Double-layered Rigid Vegetation on Flow Structure. In: Proceedings of the 9th International Symposium on Environmental Hydraulics. 2021. Seoul National University, Seoul, Korea

  18. Stone BM, Shen HT (2002) Hydraulic resistance of flow in channels with cylindrical roughness. J Hydraul Eng 128(5):500–506

    Article  Google Scholar 

  19. Tang X (2019) An improved analytical model for vertical velocity distribution of vegetated channel flows. J Geosci Environ Protect 7(04):42–60

    Article  Google Scholar 

  20. Tang X (2019) A mixing-length-scale-based analytical model for predicting velocity profiles of open-channel flows with submerged rigid vegetation. Water Environ J 33(4):610–619

    Article  Google Scholar 

  21. Wang Z, Zhang H, He X, Jiang Q, Xu W, Tian W (2022) Effects of vegetation height and relative submergence for rigid submerged vegetation on flow structure in open channel. Earth Sci Res J 26(1):39–46

    Article  Google Scholar 

  22. Singh P, Rahimi H, Tang X (2019) Parameterization of the modeling variables in velocity analytical solutions of open-channel flows with double-layered vegetation. Environ Fluid Mech 19(3):765–784

    Article  Google Scholar 

  23. Nikora N, Nikora V, O’Donoghue T (2013) Velocity profiles in vegetated open-channel flows: combined effects of multiple mechanisms. J Hydraul Eng 139(10):1021–1032

    Article  Google Scholar 

  24. Kumar P, Sharma A (2022) Experimental investigation of 3D flow properties around emergent rigid vegetation. Ecohydrology 15(8):e2474

    Article  Google Scholar 

  25. Tang X, Rahimi H, Singh P, Yuan S, Lu C (2023) Analytical modeling of mean velocity profile through two-layered fully submerged vegetation. J Hydraul Eng 149(2):04022041

    Article  Google Scholar 

  26. Tang X, Rahimi H, Guan Y, Wang Y (2021) Hydraulic characteristics of open-channel flow with partially-placed double layer rigid vegetation. Environ Fluid Mech 21:317–342

    Article  Google Scholar 

  27. Rahimi H, Tang X, Singh P, Li M, Alaghmand S (2020) Analytical model for the vertical velocity profiles in open channel flows with two layered vegetation. Adv Water Resour 137(3):103527

    Article  Google Scholar 

  28. Huai W, Wang W, Hu Y, Zeng Y, Yang Z (2014) Analytical model of the mean velocity distribution in an open channel with double-layered rigid vegetation. Adv Water Resour 69:106–113

    Article  Google Scholar 

  29. Lightbody A, Nepf H (2006) Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology. Environ Fluid Mech 6:477–488

    Article  Google Scholar 

  30. Souliotis D, Prinos P (2011) Effect of a vegetation patch on turbulent channel flow. J Hydraul Res 49(2):157–167

    Article  Google Scholar 

  31. Neary V (2003) Numerical solution of fully developed flow with vegetative resistance. J Eng Mech 129(5):558–563

    Article  Google Scholar 

  32. Marjoribanks TI, Hardy RJ, Lane SN, Parsons DR (2017) Does the canopy mixing layer model apply to highly flexible aquatic vegetation? Insights from numerical modelling. Environ Fluid Mech 17:277–301

    Article  Google Scholar 

  33. Anjum N, Ali M (2022) Investigation of the flow structures through heterogeneous vegetation of varying patch configurations in an open channel. Environ Fluid Mech 22(6):1333–1354

    Article  Google Scholar 

  34. Rahimi H, Tang X, Singh P (2020) Experimental and numerical study on impact of double layer vegetation in open channel flows. J Hydrol Eng 25(2):04019064

    Article  Google Scholar 

  35. Ghani U, Anjum N, Pasha GA, Ahmad M (2019) Numerical investigation of the flow characteristics through discontinuous and layered vegetation patches of finite width in an open channel. Environ Fluid Mech 19(6):1469–1495

    Article  Google Scholar 

  36. Tang X, Zhang S, Cao J, Wang H, Xiao N, Guan Y (2022) Effect of Multiple Layered Vegetation on the Velocity Distribution of Flow in an Open Channel. In: Proceedings of the 39th IAHR World Congress. 2022. IAHR

  37. Liu C, Shan Y, Sun W, Yan C, Yang K (2020) An open channel with an emergent vegetation patch: Predicting the longitudinal profiles of velocities based on exponential decay. J Hydrol 582:124429

    Article  Google Scholar 

  38. Caroppi G, Västilä K, Gualtieri P, Järvelä J, Giugni M, Rowiński PM (2021) Comparison of flexible and rigid vegetation induced shear layers in partly vegetated channels. Water Res Res 57(3):e2020WR028243

    Article  Google Scholar 

  39. Nepf H, White B, Lightbody A, Ghisalberti M (2007) Transport in aquatic canopies. In: Flow and Transport Processes With Complex Obstructions: Applications to Cities, Vegetative Canopies, and Industry. Springer

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Acknowledgements

The authors would like to acknowledge the support from the National Natural Science Foundation of China (11772270) and the research funding of XJTLU (REF-20-02-03 and PGRS2012007).

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Authors and Affiliations

  1. Department of Civil Engineering, Xi’an Jiaotong-Liverpool University, Suzhou, China

    Xiaonan Tang & Yutong Guan

  2. Department of Building Environment and Energy Engineering, The Hongkong Polytechnic University, Hongkong, China

    Prateek K. Singh

  3. Department of Civil and Environmental Engineering, The University of Liverpool, Liverpool, UK

    Ming Li

Authors
  1. Xiaonan Tang
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  2. Prateek K. Singh
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  3. Yutong Guan
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  4. Ming Li
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Contributions

XT: Conceptualization, Methodology, Supervision, Data analysis, Editing and Review, Funding acquisition; PS: Analysis, Writing – original draft; YG: Analysis, Writing – review & editing; ML: Review.

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Correspondence to Xiaonan Tang.

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Tang, X., Singh, P.K., Guan, Y. et al. Flow through layered vegetation in open channel flows: effect on velocity and discharge distribution. Environ Fluid Mech (2023). https://doi.org/10.1007/s10652-023-09960-y

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