Abstract
This research presents the measurement of boundary shear stress around the base of some elliptical shaped bridge piers using Preston tube technique. The uniform flow was established and a series of measurements having different discharges and channel bed slopes were undertaken. General results are established and then the effects of flow separation on the hydraulic theory are assessed. The Analysis of results shows that behind the bridge piers (horseshoe area); the amount of boundary shear stress reduces dramatically. The figure for the rate of boundary shear stress of nose to end is about τr = τn/τe = 3.6. It has a remarkable reduction even in steep slopes. The bed shear stress was found to intensify near the nose of the piers. The distribution of boundary shear stress in both mild and steep channel bed slopes along spanwise direction is presented that may give a valuable perspective of the flow action around piers.
Highlights
In engineering design and safety, the effects of alluvial river flow around a bridge pier is an important practical problem
The writer believes that the problem of scouring and deposition processes may have a close relationship with boundary shear stress around bridge piers
To investigate the hydraulic characteristics of a rectangular channel including three bridge piers inside, several series of experiments were conducted for measuring boundary shear stress around the piers, especially upstream and downstream of the piers
Summary
In engineering design and safety, the effects of alluvial river flow around a bridge pier is an important practical problem. The writer believes that the problem of scouring and deposition processes may have a close relationship with boundary shear stress around bridge piers. Breusers et al.[3] summarize the experimental and observations work on the processes of scour and deposition due to water flow around bridge piers established by other researchers[19].
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