Nonintrusive Method for Detecting Particle Movement Characteristics near Threshold Flow Conditions
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 11
Abstract
Bed-load measurements comprise an important component in the development of reliable formulas, in an effort to obtain the necessary constitutive relations between the amount of transported material and flow parameters. The uncertainty of such measurements is rather well known, being much more pronounced at lower transport rates. This uncertainty stems from the multitude of factors affecting bed-load transport and the lack of available trustworthy measuring technologies. Predictions of the limiting case of nearly zero bed-load transport, typically reported in literature as threshold of motion or critical condition, are even more challenging. The purpose of this contribution is twofold. First, to examine the sensitivity of bed-load transport measurements at conditions moderately higher than critical, to the presence of a rather unobtrusive trap, designed through several iterations. Even under relatively simple laboratory flume channel and flow conditions, it proved difficult to measure the bed-load transport rate in a completely unbiased way. Second, to develop a methodology, together with the appropriate instrumentation, for determining the condition of incipient motion. The nonintrusive approach described here proved to be reliable in detecting even the slightest movements of a particle. At the same time, it demonstrates the complexity of the problem due to the highly fluctuating nature of turbulent flow.
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Acknowledgments
The support of the National Science Foundation (Grant No. NSFEAR-0439663) for the study presented here is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 136 • Issue 11 • November 2010
Pages: 774 - 780
Copyright
© 2010 ASCE.
History
Received: Aug 1, 2009
Accepted: Apr 1, 2010
Published online: Apr 19, 2010
Published in print: Nov 2010
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