Journal ArticleDOI
Momentum transfer for practical flow computation in compound channels
Didier Bousmar,Yves Zech +1 more
TLDR
In this paper, a new theoretical 1D model of compound channels flows, the exchange discharge model, is presented, where the interactions between main channel and floodplains are taken into account as a momentum transfer proportional to the product of the velocity gradient at the interface by the mass discharge exchanged through this interface due to turbulence.Abstract:
A new theoretical 1D model of compound channels flows-the exchange discharge model-is presented. The interactions between main channel and floodplains are taken into account as a momentum transfer proportional to the product of the velocity gradient at the interface by the mass discharge exchanged through this interface due to turbulence. Geometrical changes in cross sections are also modeled; they generate a similar momentum transfer, proportional to the actual mass transfer. Both effects are incorporated into the flow equations as an additional head loss. This make the formulation suitable for stage-discharge computation but also enables practical water-profile simulations. The model is tested successfully against available experimental data for (1) stage-discharge relations; and (2) water-profile computation applied to a field case.read more
Citations
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Journal ArticleDOI
Flood inundation modelling
TL;DR: A review of state-of-the-art empirical, hydrodynamic and simple conceptual models for determining flood inundation is presented in this paper, where guidance is provided for selecting the most suitable method/model for solving practical flood related problems, taking into account the specific outputs required for the modelling purpose, the data available and computational demands.
Journal ArticleDOI
Open Channel Flow Resistance
TL;DR: In this paper, the authors discuss the differences between momentum and energy resistances, between point, cross-sectional and reach resistance coefficients, as well as compound/composite channel resistance.
Journal ArticleDOI
Stage-Discharge Prediction for Straight and Smooth Compound Channels with Wide Floodplains
TL;DR: In this paper, a modified expression to predict the boundary shear distribution in compound channels is derived and is found to provide significant improved results in predicting the stage discharge relationship using the one-dimensional (1D) approach by taking due care of the momentum transfer.
Journal ArticleDOI
Sensitivity study of large-scale particle image velocimetry measurement of river discharge using numerical simulation
TL;DR: In this article, the authors proposed a more theoretical assessment of LSPIV potential through numerical simulation, which can be used to get preliminary insights about the most important measurement conditions to organize validation studies.
Journal ArticleDOI
Interacting divided channel method for compound channel flow
TL;DR: In this article, the interacting divided channel method (IDCM) is proposed to calculate flow in compound channels. But it is based on a new parametrization of the interface stress between adjacent flow compartments, typically between the main channel and floodplain of a two-stage channel.
References
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Journal ArticleDOI
Turbulent open-channel flows with variable depth across the channel
Koji Shiono,Donald W. Knight +1 more
TL;DR: In this paper, the lateral distributions of depth-mean velocity and boundary shear stress for straight open channels with prismatic complex cross-sections are derived theoretically for channels of any shape, provided that the boundary geometry can be discretized into linear elements.
Book
Open Channel Hydraulics
TL;DR: The concept of fluid flow energy principle, the momentum principle development of uniform flow concepts, and the analysis of gradually and spatially varied flow design of channels flow measurement rapidly varied flow in non-prismatic channels turbulent diffusion and dispersion in steady open-channel flow turbulent, buoyant, surface jets and associated phenomena gradually varied, unsteady flow rapidly varied, unstable flow hydraulic models.
Journal ArticleDOI
A laboratory investigation into the interaction between the flow in the channel of a river and that over its flood plain
TL;DR: In this paper, the authors expose the result of an experimental analysis of the interaction entre l'ecoulement dans le lit d'une riviere and celui au-dessus de la plaine d'alluvions, quand the rivaniere est en crue.
Journal ArticleDOI
Discharge Assessment in Compound Channel Flow
TL;DR: In this paper, a series of laboratory tests were performed to measure the boundary shear stresses in a compound channel consisting of a main channel and associated shallow floodplains and four different floodplain roughnesses were used.
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Turbulent open-channel flows with variable depth across the channel
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