Verification of equations for incipient motion studies for a rigid rectangular channel

The current study aims to verify the existing equations for incipient motion for a rigid rectangular channel. Data from experimental work on incipient motion from a rectangular flume with two different widths, namely 0.3 and 0.6 m, were compared with the critical velocity value predicted by the equa...

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Veröffentlicht in:Water science and technology 2013-01, Vol.67 (2), p.395-403
Hauptverfasser: JOO BONG, Charles Hin, LIANG LAU, Tze, GHANI, Aminuddin Ab
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GHANI, Aminuddin Ab
description The current study aims to verify the existing equations for incipient motion for a rigid rectangular channel. Data from experimental work on incipient motion from a rectangular flume with two different widths, namely 0.3 and 0.6 m, were compared with the critical velocity value predicted by the equations of Novak & Nalluri and El-Zaemey. The equation by El-Zaemey performed better with an average discrepancy ratio value of 1.06 compared with the equation by Novak & Nalluri with an average discrepancy ratio value of 0.87. However, as the sediment deposit thickness increased, the equation by El-Zaemey became less accurate. A plot on the Shields Diagram using the experimental data had shown the significant effect of the sediment deposit thickness where, as the deposit becomes thicker, the dimensionless shear stress θ value also increased. A new equation had been proposed by incorporating the sediment deposit thickness. The new equation gave improved prediction with an average discrepancy ratio value of 1.02.
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Applied sciences
Critical velocity
Drainage, Sanitary
Exact sciences and technology
Flumes
Geologic Sediments - chemistry
Incipient motion
Mathematical analysis
Mathematical models
Models, Theoretical
Motion
Movement
Pollution
Predictions
Reproducibility of Results
Sediment
Sediments
Shear stress
Water treatment and pollution
title Verification of equations for incipient motion studies for a rigid rectangular channel
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