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.
Comparing Fixed-Vessel and Moving-Vessel ADCP Measurements in a Large Laboratory Flume
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Technical Notes
Comparing Fixed-Vessel and Moving-Vessel ADCP Measurements in a Large Laboratory Flume
Abstract
Journal of Hydraulic EngineeringDecember 2007
Journal of Hydraulic EngineeringOctober 2009
Journal of Hydraulic EngineeringDecember 2007
Authors
Senior Member of Technical Staff, Water Power Technologies, Sandia National Laboratories, P.O. Box 5800, 1515 Eubank Ave., Albuquerque, NM 87185-1124; formerly, Postdoctoral Research Associate, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, TN 37831 (corresponding author). E-mail: [email protected]
Principal Member of Technical Staff and Marine and Hydrokinetic Energy Lead, Water Power Technologies, Sandia National Laboratories, P.O. Box 5800, 1515 Eubank Ave., Albuquerque, NM 87185-1124; formerly, Water Resources Engineer, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, TN 37831. E-mail: [email protected]
Research Associate, Dept. of Mechanical Engineering, Univ. of Washington, Stevens Way, P.O. Box 352600, Seattle, WA 98195. E-mail: Craig Hill [email protected]
Received: January 11, 2013
Accepted: September 08, 2016
Published online: January 24, 2017
©2017 American Society of Civil Engineers