ORIGINAL PAPER
Investigation of Shear Stress Distribution in a 90 Degree Channel Bend
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1
Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University Ho Chi Minh City, Vietnam 19, Nguyen Huu Tho Str., Tan Phong Ward, Dist. 7, Ho Chi Minh City, Vietnam
 
2
VNU-HCM, University of Science 227 Nguyen Van Cu Str., 5 Dist., Ho Chi Minh City, Vietnam
 
3
Institute of Coastal and offshore Engineering (ICOE) 658 Vo Van Kiet Boulevard, Dist. 5, HCM City, Vietnam
 
 
Online publication date: 2019-03-12
 
 
Publication date: 2019-03-01
 
 
International Journal of Applied Mechanics and Engineering 2019;24(1):213-220
 
KEYWORDS
ABSTRACT
Shear stress is a key parameter that plays an important role in sediment transport mechanisms; therefore, understanding shear stress distribution in rivers, and especially in river bends, is necessary to predict erosion, deposition mechanisms and lateral channel migration. The aim of this study is to analyze the shear stress distribution near a river bed at 90-degree channel bend using a depth-average method based on experimental measurement data. Bed shear stress distribution is calculated using the depth-averaged method based on velocity components data has been collected from a 3D-ADV device (three-dimensional acoustic doppler velocity) at different locations of a meandering channel. Laboratory experiments have been made at the hydraulic laboratory of the RCRFIDF (Research Center for River Flow Impingement and Debris Flow), Gangneung-Wonju National University, South Korea to provide data for simulating the incipient motion of the riverbed materials and then predicting the river morphological changes in the curved rivers. The calculated results show that the maximum value of shear stress distribution near the riverbed in the different cross sections of the surveyed channel occurs in a 70-degree cross section and occurs near the outer bank. From the beginning of a 40-degree curved channel section, the maximum value of the shear stress occurs near the outer bank at the end of the channel.
 
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ISSN:1734-4492
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