Linear-Momentum Flux to Overbank Sections

Wright, Robert R.; Carstens, M. R.

doi:10.1061/jyceaj.0002677

Cited by 39 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shear stress distribution in the straight compound channel and the compound meandering channel have been investigated by a number of authors [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12] and [13]. Most of hydraulic formulae derived by the author assuming that the shear stress distribution is uniform over the wetted perimeter.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Shear Stress Distribution in a Compound Meandering Channel

Amin¹

2013

AJCE

View full text Add to dashboard Cite

Naturally river flow can be characterized as compound meandering channel in which the shear stress characteristics are quite intricate. Reliable investigation of shear stress distribution in a compound meandering channel is essential in solving a variety of river hydraulics and engineering problems, designing stable channels and bank protection, understanding the mechanism of sediment transport. A laboratory experiment has been conducted in a compound meandering channel with symmetric cross-sections having floodplain width ratio of 1, 1.67, 2.33, 3 and depth ratio of 0.20, 0.30, 0.35, 0.40 using the large-scale open air facility

show abstract

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Shear Stress Distribution in a Compound Meandering Channel

Amin¹

2013

AJCE

View full text Add to dashboard Cite

show abstract

“…The phenomenon of interaction emerging in the transition region between the main channel and the floodplain is described by separating the two streams, most often with vertical lines, on which the apparent shear stresses were assigned. The concept of the apparent tangential stresses at the division boundaries of the channel compound cross-sections was introduced by Wright and Carstens (1970). Since the 1980s, in accordance with the concept of apparent shear stress, a number of formulas have been introduced based on hydraulic experiments in channels to calculate flow resistance due to momentum transfer between the main channel and the floodplain (Myers, 1987;Wormleaton et al, 1982;Knight and Demetriou, 1983;Prinos and Townsend, 1984;Christodoulou, 1992).…”

mentioning

confidence: 99%

Apparent Friction Coefﬁcient Used for Flow Calculation in Straight Compound Channels With Trees On Floodplains

Kozioł,

Kiczko,

Krukowski

et al. 2024

Preprint

View full text Add to dashboard Cite

Abstract. The interaction of water streams in channels with a complex cross-section, involving the exchange of water mass and momentum between slowly-flowing water in the floodplains and fast water in the main channel, significantly depends on the diversiﬁcation of the surface roughness between the main channel and ﬂoodplains. Additionally, trees strongly increase flow resistance on floodplains, but also significantly in the main channel by intensifying the interaction process. As a result, the water velocity and the discharge capacity of both parts of the channel decrease and at the same time, affecting the flow conditions in the main channel. The results of laboratory experiments were used to determine the effect of floodplain trees on the discharge capacity of the channel with diversiﬁed roughness. The reduction in velocity of the main channel caused by the stream interactions is described with the apparent friction coefﬁcients introduced at the boundary between the main channel and the ﬂoodplain. The values of resistance coefficients and their changes as a result of the significant influence of trees on the interaction process were determined for various roughness’s of the main channel bottom.

show abstract

Numerical modeling of turbulent compound channel flow using the lattice Boltzmann method

Liu

Zhou

Burrows

2008

Numerical Methods in Fluids

View full text Add to dashboard Cite

SUMMARYThe flow of water in a straight compound channel with prismatic cross section is investigated with a relatively new tool, the lattice Boltzmann method. The large eddy simulation model is added in the lattice Boltzmann model for nonlinear shallow water equations (LABSWE TM ) so that the turbulence, caused by lateral exchange of momentum in the shear layer between the main channel and floodplain, can be taken into account and modeled efficiently. To validate the numerical model, a symmetrical compound channel with trapezoidal main channel and flat floodplain is tested. Similar to most natural watercourses, the floodplain has higher roughness values than the main channel. Different relative depths, D r (the ratio of the depth of flow on the floodplain to that in the main channel), are considered. The Reynolds number is set at 30 000 in the main channel. The lateral distributions of the longitudinal velocity, the boundary shear stress, the Reynolds stress and the apparent shear stress across the channel are obtained after the large eddy simulation is performed. The results of numerical simulations are compared with the available experiment data, which show that the LABSWE TM is capable of modeling the features of flow turbulence in compound channels and is sufficiently accurate for practical applications in engineering.

show abstract

Linear-Momentum Flux to Overbank Sections

Cited by 39 publications

References 0 publications

An Experimental Study of Shear Stress Distribution in a Compound Meandering Channel

An Experimental Study of Shear Stress Distribution in a Compound Meandering Channel

Apparent Friction Coefﬁcient Used for Flow Calculation in Straight Compound Channels With Trees On Floodplains

Numerical modeling of turbulent compound channel flow using the lattice Boltzmann method

Contact Info

Product

Resources

About