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

Bong, Charles Hin Joo and Tze, Liang Lau and Aminuddin, Bin Ab Ghani (2013) Verification of equations for incipient motion studies for a rigid rectangular channel. Water Science & Technology, 67 (2). pp. 395-403. ISSN 1996-9732

PDF Verification of equations for incipient motion studies for a rigid rectangular channel - Copy.pdf Download (112kB)

Abstract

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.

Actions (For repository members only: login required)

View Item