Turbulence Measurements with Acoustic Doppler Velocimeters
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Volume 131, Issue 12
Abstract
The capability of acoustic Doppler velocimeters to resolve flow turbulence is analyzed. Acoustic Doppler velocimeter performance curves (APCs) are introduced to define optimal flow and sampling conditions for measuring turbulence. To generate the APCs, a conceptual model is developed which simulates different flow conditions as well as the instrument operation. Different scenarios are simulated using the conceptual model to generate synthetic time series of water velocity and the corresponding sampled signals. Main turbulence statistics of the synthetically generated, sampled, and nonsampled time series are plotted in dimensionless form (APCs). The relative importance of the Doppler noise on the total measured energy is also evaluated for different noise energy levels and flow conditions. The proposed methodology can be used for the design of experimental measurements, as well as for the interpretation of both field and laboratory observations using acoustic Doppler velocimeters.
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Acknowledgments
A number of federal and state agencies have supported several research projects leading to this work at the University of Illinois. They are the National Science Foundation, the Office of Naval Research, the U.S. Army Corps of Engineering, the U.S. Geological Survey, the U.S. Department of Agriculture, the Illinois Water Resources Center, the Illinois Department of Natural Resources, and the Metropolitan Water Reclamation District of Greater Chicago. The findings in this paper are the sole opinion of the writers and do not support or endorse any specific manufacturer of acoustic Doppler velocimeters. The writers thank Jim Best for his help in making the manuscript more readable as well as two anonymous reviewers for their constructive criticism.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 12 • December 2005
Pages: 1062 - 1073
Copyright
© 2005 ASCE.
History
Received: Apr 6, 2004
Accepted: Mar 23, 2005
Published online: Dec 1, 2005
Published in print: Dec 2005
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