Flow Patterns in Compound Channels with Vegetated Floodplains

Yang, Kejun; Cao, Shuyou; Knight, Donald W.

doi:10.1061/(asce)0733-9429(2007)133:2(148)

Cited by 159 publications

(77 citation statements)

References 16 publications

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“…In recent d ecades, the three-dimensional flow structure, turbulence characteristics and secondary flows in straight compound channels have been extensively investigated by, amongst others, Knight and Demetriou [14], Pasche and Rouve [25], Knight and Sellin [15], Tominaga et al [41], Yuen [45], Carling et al [3] and Yang et al [43]. Moreover, lateral distribution methods (LDM) for the depth-averaged velocity and bed shear stress, along with the secondary flow and the planform vorticity, have been developed by Shiono and Knight [31], Cao et al [2], Rameshwaran and Shiono [29], Huai et al [9], Hu et al [8]，Liu et al [20] and Yang et al [44].…”

Section: Introductionmentioning

confidence: 99%

An analytical model for lateral depth-averaged velocity distributions along a meander in curved compound channels

Wright

Liu

Yang

2014

Advances in Water Resources

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Section: Introductionmentioning

confidence: 99%

An analytical model for lateral depth-averaged velocity distributions along a meander in curved compound channels

Wright

Liu

Yang

2014

Advances in Water Resources

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“…In these figures, grass, no vegetation, shrub and tree refer to the results of Yang's paper and Runs 1, 2, 3, 4, 5 and 6 refer to the results of the present study. As described by Yang et al (2007a), H r is defined for the floodplain and main channel, separately using following equations:…”

Section: The Location Of Maximum Value Of Streamwise Velocity In Floomentioning

confidence: 99%

“…To investigate resistance characteristics of in-bank and overbank flows, more recently Yang et al (2007a) examined the influence of different types of vegetation on flow structure especially at the edge of the floodplain and showed that characteristics of flow such as secondary currents and lateral velocity distribution are very complex at the edge of the floodplain in vegetated compound open channel.…”

Section: Introductionmentioning

confidence: 99%

How far must trees be cultivated from the edge of the flood plain to provide best river bank protection?

Esfahani

Keshavarzi

2010

International Journal of River Basin Management

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In this study, to find the best location to cultivate the trees for river bank protection, some experimental tests were performed. One row of trees were cultivated at five different distances from the main channel/floodplain interface in a rectangular compound open channel. In experimental model for simulating the trees, some cylindrical wood rods were attached to the bed of flood plain. The three-dimensional flow velocity of flow in a cross-section between the trees were measured in 149 nodal points using Micro-acoustic Doppler velocimeter (ADV) velocity meter. At each nodal point, 6000 velocity data for each direction were stored in a computer. From the analysis of the experimental data, it was concluded that upon cultivating trees at 10% distance of flood plain width from the edge of main channel, the minimum streamwise velocity occurred near main channel/floodplain interface, while the maximum streamwise velocity occurred far from the edge of floodplain. Therefore, the best location for cultivating the trees was found to be at 10% of floodplain width and it is suggested for river bank protection in practical applications.

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“…For example, Liu et al [26] proposed analytical models of streamwise velocity in flows with submerged shrub-like vegetation. Yang et al [27] experimentally studied the velocity distribution of flows in different types of vegetations such as arbors, shrubs, and grass. For the channel partially covered with vegetation, Zhang et al [28] developed the 2D k-turbulence hydrodynamic model to simulate the turbulent vegetated flow in this situation.…”

Section: Introductionmentioning

confidence: 99%

Analytical solution of velocity distribution for flow through submerged large deflection flexible vegetation

Wang

Huai

Chen

et al. 2014

Appl. Math. Mech.-Engl. Ed.

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An analytical solution for predicting the vertical distribution of streamwise mean velocity in an open channel flow with submerged flexible vegetation is proposed when large bending occurs. The flow regime is separated into two horizontal layers: a vegetation layer and a free water layer. In the vegetation layer, a mechanical analysis for the flexible vegetation is conducted, and an approximately linear relationship between the drag force of bending vegetation and the streamwise mean flow velocity is observed in the case of large deflection, which differes significantly from the case of rigid upright vegetation. Based on the theoretical analysis, a linear streamwise drag force-mean flow velocity expression in the momentum equation is derived, and an analytical solution is obtained. For the free water layer, a new expression is presented, replacing the traditional logarithmic velocity distribution, to obtain a zero velocity gradient at the water surface. Finally, the analytical predictions are compared with published experimental data, and the good agreement demonstrates that this model is effective for the open channel flow through the large deflection flexible vegetation.

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Flow Patterns in Compound Channels with Vegetated Floodplains

Cited by 159 publications

References 16 publications

An analytical model for lateral depth-averaged velocity distributions along a meander in curved compound channels

An analytical model for lateral depth-averaged velocity distributions along a meander in curved compound channels

How far must trees be cultivated from the edge of the flood plain to provide best river bank protection?

Analytical solution of velocity distribution for flow through submerged large deflection flexible vegetation

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