Measurement of Bed Load Velocity using an Acoustic Doppler Current Profiler
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Volume 128, Issue 5
Abstract
A new technique has been developed to measure the apparent velocity of bed load using an acoustic Doppler current profiler. The technique involves estimating the bias in bottom tracking due to a moving bottom. Mean measured at sampling stations in the gravel-bed Fraser River correlated well with mean bed load transport rates measured using conventional samplers. Mean was also correlated with boundary shear stress estimated by a log-law fit to the mean velocity profile. Estimates of from individual 5 s ensemble averages were extremely variable: the coefficient of variation for a sampling station ranged from 1.0 to 6.4, and 25 min of sampling were required to achieve stable estimates of the mean and coefficient of variation (within 5% error). Variance was due to both real temporal variability of transport and measurement error. The mechanisms that produce this variability are discussed and preliminarily quantified.
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Copyright © 2002 American Society of Civil Engineers.
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Received: Feb 20, 2001
Accepted: Oct 25, 2001
Published online: Apr 15, 2002
Published in print: May 2002
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