Apparent Shear Stress And Boundary Shear
Distribution In A Compound Channel Flow
Author(s)
K. K. Khatua, K. C. Patra, S. Behera & P. K. Mohanty
Abstract
The flow structure in any compound channel is a complicated process due to the
transfer of momentum between the deep main channel section and the adjoining
shallow floodplains. The boundary shear stress distribution in the main channel
and floodplain greatly affects the momentum transfer. In the present work, the
shear stress distributions across an assumed interface plane originating from the
junction between the main channel and flood plain using the Divided Channel
Method (DCM) are analyzed and tested for different compound channels and
their flow conditions using global data. An improved equation to predict the
boundary shear distribution in compound channels for different width ratios is
derived that gives better results than other proposed models. Analyses are also
done to suitably choose an appropriate interface plane for evaluation of stagedischarge
relationship for compound channels having equal roughness in the
channel beds and walls. The effectiveness of predicting the stage-discharge
relationship using the apparent shear stress equation and boundary shear
distribution models are discussed.
Keywords: apparent shear, main channel, floodplain, compound channel,
discharge estimation, interface planes.
1 Introduction
During floods, a part of the river discharge is carried by the main channel and the
rest is carried by the floodplains. Momentum transfer between the flow of deep
main channel and shallow floodplain takes place making the discharge prediction
in compound channel more difficult. In the laboratory the mechanism of
momentum transfer between the channel section and floodplain was first
investigated and demonstrated by Zheleznyakov [30] and Sellin [24].
Keywords
apparent shear, main channel, floodplain, compound channel,
discharge estimation, interface planes
Related Book
Other papers in this volume
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