CONTRACTION EFFECT UPSTREAM ABUTMENTS ON VELOCITY AND SCOUR: EXPERIMENTALAND THEORETICAL STUDY USING IRIC SOFTWARE

Document Type : Research Paper

Authors

1 Water Eng. and Water Structures Depart., Faculty of Engineering, Zagazig University, Egypt,

2 Department of Construction Engineering, College of Engineering in Al-Qunfudhah, Umm Al- Qura University, KSA, On leave from Water Engineering and Water Structures Department, Faculty of Engineering, Zagazig University, Egypt.

Abstract

This paper studies scour features and velocity field using experimental and numerical models at
rectangular piers under influence of contraction upstream abutments. A bridge model of two vents
of 8cm width each is built to conduct experiments. Extra-piles are proposed upstream rectangular
abutments. Different relative extensions of piles are tested. In addition, a new abutment of a relative
width ranges within 0.0 to 1.25was proposed instead of piles. The flume’s dimensions are 40cm
width, 20 cm deepness and 400cm length. Some design rules are deduced to reduce scour upstream
rectangular piers. Cases of locating piles upstream abutments are simulated numerically using
SToRM solver in iRIC software. The numerical results indicate that, piles of a relative extension to
vent width = 4.812 produce the minimal flow velocity near rectangular piers.

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JES. Journal of Engineering Sciences
Volume 45, No 1
January and February 2017
Pages 17-27

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