Date of Award

2009

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Civil and Environmental Engineering

First Advisor

Balachandar, Ram (Civil Engineering)

Keywords

Engineering, Marine and Ocean.

Rights

CC BY-NC-ND 4.0

Abstract

A review of laboratory and field studies for scour around piers reveals the process of water-pier-sediment interaction to be complex. Further, laboratory studies have been conducted under a wide range of conditions using flumes of various widths. Under similar flow conditions, the results are quite varied. The scouring process and empirical design equations are primarily based on laboratory data, while the sidewall interference has mostly been ignored. In the present study, effects of wall interference (blockage) on circular bridge pier local scour were examined under clear water conditions. Experiments were conducted in two flumes of different widths utilizing piers of various diameters producing blockage ratios from 2.2% to 5.0% while maintaining constant flow conditions. Significant blockage effects were observed at ratios where it was expected to be absent or reduced. To further characterize scour depth, the effect of densimetric Froude number was examined and found to be an important factor.

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