Boundary Shear Stress Analysis in Meandering Channels at the Bend Apex

Sankalp, Sovan; Khatua, Kishanjit Kumar; Pradhan, Arpan

doi:10.1016/j.aqpro.2015.02.101

Cited by 4 publications

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“…Meandering rivers often exhibit asymmetrical nature, with the outer bend of the meandering section having the deepest section. The velocities in the deeper sections are relatively higher, which triggers erosion in the outer bend (Sankalp et al 2015). However, the inner bend velocities are on the slower side, which can't carry the sediment load.…”

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Depth-Averaged Velocity Distribution in a Meandering Compound Channel Using Calibrating Coefficients

et al. 2021

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The precise prediction of the depth-averaged velocities, lateral shear stresses, and boundary shear stresses are necessary to access the flow capacity and flow variations related to flood events in meandering channels. The accurate assessment of the distribution of velocities, conveyance, and bed shear stress distribution is significant for flood management schemes, bank protection studies, and sediment dynamics on meandering channels. This work proposes a new approach for assessing the depth-averaged velocities laterally across a meandering compound channel. The experimental evaluation was done in Hydraulic Laboratory in the National Institute of Technology Rourkela (NITR), Odisha, India. The apex section was considered for estimating the boundary shear stress through experimentation. The meander crosssection is split into five distinctive panels for studying the flow phenomenon for overbank flow. The results indicated that the boundary shear stress causes a notable change in the secondary flow coefficient (K). The new model provides the variation of depth-averaged velocity (U d ) across the cross-section of the meandering compound channel, which includes the bed-generated friction, secondary flows, and lateral shear turbulence. KeywordsMeandering compound channel • Lateral depth-averaged velocity • Velocity distribution • Secondary flow coefficient • Boundary shear stress IntroductionRivers are considered to be a blessing to society and one of the essential parts of nature. The river plays a vital role in every living being in its way. Some of our basic needs related to water, such as drinking, cleaning, washing clothes, etc., are also being fulfilled by a river. Furthermore, human-made channels are of great importance from the early days as these are of great worth in producing power for different industries. Rivers have always been an attraction of researchers around the globe from many disciplines. The river curves, commonly known as meanders, are so ubiquitous; as the

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Depth-Averaged Velocity Distribution in a Meandering Compound Channel Using Calibrating Coefficients

et al. 2021

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“…River flow in meanders are highly three dimensional; with the primary flow in the flow direction, and the secondary flow in transverse and vertical directions (Liu and Bai, 2014;Stoesser et al, 2010). Due to the morphology of meanders, the main secondary current developed induces shear stresses and consequent erosion on the outer bank, while another secondary current moves the eroded sediment through convection to the convex banks (Chen and Tang, 2012;Engel and Rhoads, 2017;Sankalp et al, 2015;Stoesser et al, 2010).…”

Section: Meanders and Channel Migrationmentioning

confidence: 99%