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Corresponding Author

El-Alfy, Kassem

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

The present study deals with the backwater rise upstream contracted and obstructed cross – sections due to construction of abutments and piers of bridges through the stream from the experimental point of view. The study was carried out for three different shapes of abutments and pier length on upstream backwater rise was studies. The collected data from the different series of experiments were used to formulate a general relationship for computing the maximum backwater rise as a function of normal flow condition, geometrical boundaries of the bridges showed that it depended mainly on the ratio of stream width to vents width (B/b) and normal flow conditions away from the bridge zone effect (Fro). While both the shape and the length of abutments and piers had a small effect on backwater rise compared with the aforementioned parameters. Also, the experimental results showed that the value of backwater rise was more sensitive to the value of B/b compared with the other parameters under study. The comparison between the values of backwater rise from the proposed formula and those resulted from Gauthy formula [3] was carried out.

Keywords

Backwater- Contracted cross-section- Obstructed; abutment

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