Flow Measurement Using Flying ADV Probes
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 12
Abstract
An innovative measurement system of “flying” acoustic Doppler velocimeters was designed in order to allow rapid velocity measurement over a large flow field. Such measurements are necessary, for example, when measuring over a temporally varying and locally nonuniform rough bed. The measurement technique was verified by comparison with measurements taken in the same flows using a traditional stationary probe technique. Comparison showed that the flying-probe approach performs similarly to stationary measurements in capturing the mean flow field and turbulent fluctuations. The data obtained from flying probe experiments can be used to describe the flow in terms of double-averaged hydrodynamic variables, obtained by averaging in time and spatial domains within a thin slab parallel to the mean bed. Examples are presented of flow measurements over a fixed flat bed, a fixed dune bed, and over mobile developing bed forms. It is shown that near-bed measurements suffer from boundary reflection interference, though affected data can be filtered out based on the ADV-measured correlation coefficient. Measurement below roughness tops is possible, with in-bed records being detectable by spikes in measured signal-to-noise-ratio and by comparison with measured bed topography.
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Acknowledgments
This research was funded by the Marsden Fund (UOA220) administered by the Royal Society of New Zealand. The writers would like to thank Stuart Cameron for his help in preparing figures, and his helpful review of the paper. The helpful suggestions of anonymous reviewers are gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 12 • December 2007
Pages: 1345 - 1355
Copyright
© 2007 ASCE.
History
Received: Apr 5, 2006
Accepted: Jun 15, 2007
Published online: Dec 1, 2007
Published in print: Dec 2007
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