Modelling boundary shear stress in highly sinuous meandering channels

Precise estimation of boundary shear force distribution is essential to deal with various hydraulic problems such as channel design, channel migration and interaction losses. Bed shear forces are useful for the study of bed load transfer, whereas wall shear forces presents a general view of channel...

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Bibliographic Details
Published in:ISH journal of hydraulic engineering 2014-05, Vol.20 (2), p.161-168
Main Authors: Patnaik, M., Patra, K.C., Khatua, K.K., Mohanty, L.
Format: Article
Language:English
Subjects:
aspect ratio
boundary shear
meandering
open channel
sinuosity
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Summary:Precise estimation of boundary shear force distribution is essential to deal with various hydraulic problems such as channel design, channel migration and interaction losses. Bed shear forces are useful for the study of bed load transfer, whereas wall shear forces presents a general view of channel migration pattern. In this paper, a first ever attempt is made to study the distribution of boundary shear force in a highly sinuous (sinuosity = 2.04) trapezoidal meandering experimental channel. Besides, a separate analysis is carried out at the inner as well as outer banks at the bend apex to include the curvature effect. Thus, the objective is to evaluate the percentage of wall shear as well as bed shear force to the total boundary shear force which will pave for the better understanding on scouring and depositional patterns in meandering channels. Based on experimental results, the effect of aspect ratio and sinuosity on wall (inner and outer) and bed shear forces are calculated and empirical equations are developed to determine the percentage of wall and bed shear forces in smooth meandering channel for in bank flows only.
ISSN:0971-5010
2164-3040
DOI:10.1080/09715010.2013.860733