Evaluation of ADCP Apparent Bed Load Velocity in a Large Sand-Bed River: Moving versus Stationary Boat Conditions
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 9
Abstract
Detailed mapping of bathymetry and apparent bed load velocity using a boat-mounted acoustic Doppler current profiler (ADCP) was carried out along a 388-m section of the lower Missouri River near Columbia, Missouri. Sampling transects (moving boat) were completed at 5- and 20-m spacing along the study section. Stationary (fixed-boat) measurements were made by maintaining constant boat position over a target point where the position of the boat did not deviate more than 3 m in any direction. For each transect and stationary measurement, apparent bed load velocity () was estimated using ADCP bottom tracking data and high precision real-time kinematic (RTK) global positioning system (GPS). The principal objectives of this research are to (1) determine whether boat motion introduces a bias in apparent bed load velocity measurements; and (2) evaluate the reliability of ADCP bed velocity measurements for a range of sediment transport environments. Results indicate that both high transport () and moving-boat conditions (for both high and low transport environments) increase the relative variability in estimates of mean bed velocity. Despite this, the spatially dense single-transect measurements were capable of producing detailed bed velocity maps that correspond closely with the expected pattern of sediment transport over large dunes.
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Acknowledgments
The authors would like to thank the U.S. Geological Survey and Caroline Elliott, Chad Vishy, and Lindell Harmon at the Columbia Environmental Research Center in Columbia, Missouri, for their technical support and assistance during the data collection. The comments from USGS staff (David Mueller and Ryan Jackson) and three anonymous reviewers were very helpful in the improvement of the paper.
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© 2011 American Society of Civil Engineers.
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Received: Nov 2, 2009
Accepted: Dec 1, 2010
Published online: Aug 15, 2011
Published in print: Sep 1, 2011
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