Brief Report
Oct 1977
Effect of Sediment Gradation on Clear Water Scour
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VIEW THE REPLYAuthors: Arved J. Raudkivi and Robert EttemaAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 103, Issue 10
Abstract
A comparison of the published experimental data on scour depths at bridge piers shows a large range of values at what appears to be identical conditions. It was therefore decided to investigate whether or not this variation could arise from different grain-size distributions of the bed material used. The experiments were carried out in a reecirculating flume 38 m long, 1.5 m wide, and 1.2 m deep, using a 100 mm-diam cylindrical pier. In the experiments, the d50 grain size and the grain-size distribution were systematically varied. Trial runs showed that for a given shear velocity, depth of flow greater than about two pier diameters had no observable effect on the depth of scour, and thereafter all tests were run at a flow depth of 0.60m, or six pier diameters. The velocity of the approach flow and the shear velocities were determined from the slope of the velocity distribution. Details of the study have been reported by Ettema together with a detailed evaluation of the development of the scour hole.
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Published In
Journal of the Hydraulics Division
Volume 103 • Issue 10 • October 1977
Pages: 1209 - 1213
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© 1977 American Society of Civil Engineers.
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Published in print: Oct 1977
Published online: Feb 3, 2021
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Arved J. Raudkivi
Prof. of Civ. Engrg., Univ. of Auckland, Auckland, New Zealand
Robert Ettema
Postgrad. Student, Univ. of Auckland, Auckland, New Zealand
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