Research Papers: Fundamental Issues and Canonical Flows

Influence of Vegetation on Turbulence Characteristics and Reynolds Shear Stress in Partly Vegetated Channel

[+] Author and Article Information
Huayong Zhang

Research Center for Engineering Ecology
and Nonlinear Science,
North China Electric Power University,
Beijing 102206, China
e-mail: rceens@ncepu.edu.cn

Zhongyu Wang

Research Center for Engineering Ecology
and Nonlinear Science,
North China Electric Power University,
Beijing 102206, China
Industrial Systems Engineering,
University of Regina,
Regina, SK S4S 0A2, Canada
e-mail: zhy_wang@163.com

Liming Dai

Fellow ASME
Industrial Systems Engineering,
University of Regina,
Regina, SK S4S 0A2, Canada
e-mail: liming.dai@uregina.ca

Weigang Xu

Institute of Wetland Research,
Chinese Academy of Forestry,
Beijing 100091, China
e-mail: xuweigang@foxmail.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received November 19, 2013; final manuscript received January 12, 2015; published online March 4, 2015. Editor: Malcolm J. Andrews.

J. Fluids Eng 137(6), 061201 (Jun 01, 2015) (8 pages) Paper No: FE-13-1678; doi: 10.1115/1.4029608 History: Received November 19, 2013; Revised January 12, 2015; Online March 04, 2015

From the perspective of vegetation density, this research studies the influence of vegetation on turbulence characteristics and Reynolds shear stress in partly vegetated channel via a series of experiments. Natural reed is employed to simulate the emergent vegetation in rivers. Different vegetation densities including vegetated and unvegetated cases are considered in the research. The results of the research demonstrate that emergent vegetation may force the water flowing from vegetated areas to unvegetated areas and the forcing intensity increases with reed density. It is also found that the relative turbulence intensity declines along the vegetated channel in the direction of flow. Vegetation is found to reduce the total-average Reynolds shear stress therefore reduce the soil erosion. However, the Reynolds shear stress reduction is found disproportional to the vegetation density, and an optimal vegetation density range is quantitatively determined in the research. The findings of the research are significant to the practice of river ecological restoration.

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Fig. 1

Experimental flume setup: (a) side view and (b) plan view

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Fig. 2

Experimental material and stem diameter distribution

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Fig. 3

Measuring equipment with the ADVs and steel frame

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Fig. 4

Variation of flow depth, Reynolds number, and Froude number relate to flow discharge

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Fig. 5

Velocity distribution along five longitudinal-sections

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Fig. 6

Variation of relative turbulence intensity along five longitudinal-sections

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Fig. 7

Variation of Reynolds shear stress along five longitudinal-sections: (a) 0 stems/m2, (b) 54 stems/m2, (c) 108 stems/m2, and (d) 202 stems/m2

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Fig. 8

Variation of average Reynolds shear stress with vegetation density




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