Abstract
This study builds upon established methods for using acoustic Doppler current profilers (ADCPs) to measure velocities to include another measurement technique—longitudinal measurements—which are increasingly being used in open channel flow studies. Longitudinal measurements are collected in paths that parallel the streamwise direction as opposed to transect measurements, which are collected perpendicular to the flow direction. This study analyzed ADCP data that were collected concurrently using stationary, transect, and longitudinal collection methods in order to determine which method can be used to most effectively develop interpolated velocity maps. Data from the Pecatonica River in Freeport, Illinois, and the St. Joseph River in Berrien Springs, Michigan, were used as case studies for comparing measurement techniques. To compare interpolated velocities calculated using the longitudinal data collection technique with a traditional transect data collection scheme, the variables of data density and data collection effort were systematically altered to investigate both methods. Data collection effort time was utilized to provide equivalent velocity comparison between the ADCP data collection techniques. Plots that compared interpolated transect and longitudinal velocities to transect and stationary data illustrated that the longitudinal interpolated velocities match the known data and mimic the cross section velocity trend better than the interpolated transect depth averaged velocities. The longitudinal measurement technique was substantially better at describing the depth averaged velocity variation for the river reaches investigated.
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Acknowledgments
The authors would like to offer sincere appreciation to Steven Banjavcic of S and S Database Consultants for all of his effort in the development of interpolation analysis software. In addition, they would like to thank Bruce Rhoads, James Best, Jim Slowikowski, and Robbie Schmidt for all of their assistance in making the data collection possible. Finally, special thanks to John Sloat and Diana Krupa of WaterCube and Craig Huhta of One Fish Engineering for the use of ADCP processing and visualization software.
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Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Apr 4, 2017
Accepted: Jun 6, 2018
Published online: Sep 19, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 19, 2019
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