Investigation of Local Scour Around Group Bridge Pier with Different Shapes

Mustafa Gunal,Tahseen Gelmiran,Khalil Othman

doi:10.33899/rengj.2019.164355

Abstract

Investigation of Local Scour Around Group Bridge Pier with Different Shapes

Highlights

The term of scour is used to designate erosion by flowing water, resulting in undermining foundation or bank, in lowering a stream bed below its natural or average level [1]
The scour specified two main classifications of topical scour at bridge piers based on the procedure of sediment transport by the relative stream, namely clear water scour and live bed scour; itoccurs when the scour hole is continually replenished with sediment by approach flow [8]
Nandana and et al.[11], in this study, was concluded the orientation group bridge piers of scour depth the 30° orientation leading to a minimum scour depth is taken into account the best direction and adopted in experiments on partial group bridge pier of 60° orientation resulted in maximum scour depth.Debnath and Chaudhuri [12],in this study the maximum of the scour depth for round-nosed bridge piers were a generally lower while, the values of scour depths were higher for the square and rectangular bridge piers compared to the circular bridge pier for comparable bed material characteristics

Summary

INTRODUCTION

The term of scour is used to designate erosion by flowing water, resulting in undermining foundation or bank, in lowering a stream bed below its natural or average level [1]. Scour has long been decided that the basic mechanism causing topical scour at bridge piers the down flow at the upstream face of the bridge piers and pointing of vortices at the foundation [5,6]. Adnan and et al [14], in this study behave the result of the change within the position of bridge piers of the scour decrease with reference to flow direction and applied three bridge piers, circular 10 cm diameter, upstream facing round-nosed (10-4) cm diameters and downstream facing round-nosed (4-10) cm diameters of bridge piers were tested of the under live-bed sand material with the discharge 58 l/s, for period of 180 minutes.Equilibrium scour is said to occur when the scour depth does not change appreciably with time. The depth of scouring around the bridge piers was measured for 360 minutes, but equilibrium depth scours achieved after less than 180 minutes for all experiments

EXPERIMENTAL PROGRAM

EQUILIBRIUM TIME

SPACINGBETWEEN BRIDGE PIERS

DEVELOPMENTOF NEW FORMULA

CONCLUSIONS