Comparing Fixed-Vessel and Moving-Vessel ADCP Measurements in a Large Laboratory Flume
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 5
Abstract
The error of the spatiotemporally averaged (STA) velocities of moving-vessel (MV) acoustic Doppler current profiler (ADCP) measurements was estimated by comparison with time-averaged fixed-vessel (FV) ADCP measurements in a large laboratory flume. Controlled laboratory conditions ensured that only the movement of the ADCP differed between these two measurements. Three different MV speeds (surrogates of horizontal bin sizes), were investigated. Results indicate no statistically significant differences in the zero-order quantities, discharge, and bulk velocity among STA MV measurements, and between STA MV and FV measurements. However, the traverse speed does affect the accuracy of the measurement of the local velocity, a first-order quantity, including the transverse and vertical components needed to evaluate the turbulence-driven secondary flow in the channel. Although the present study is limited to a unique ADCP, it demonstrates the value of controlled laboratory experiments for quantifying STA MV errors.
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Acknowledgments
This research was supported by the U.S. Department of Energy’s (DOE) Office of Energy Efficiency and Renewable Energy, Wind and Water Power Technologies Program and the DOE Advanced Water Power Project Grant No. DE-FG36-08GO18168/M001. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for DOE under contract DE-AC05-00OR22725. The use of trade, product, or firm names in this paper is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 5 • May 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 11, 2013
Accepted: Sep 8, 2016
Published online: Jan 24, 2017
Published ahead of print: Jan 25, 2017
Published in print: May 1, 2017
Discussion open until: Jun 24, 2017
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