Turbulent Flow near Vertical Angled Fish Screen
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 11
Abstract
Mean and turbulent flow characteristics on the upstream and downstream sides of the screen in a flow diversion channel have important implications for operation and maintenance (e.g., sedimentation) and for assessing fish behavior related to flow turbulence. This technical note extends an earlier study on mean flow near screens to turbulence characteristics. Acoustic Doppler velocimeter was used to explore three-dimensional mean and turbulent flow characteristics on the upstream and downstream sides of vertical angled fish screens. The present study confirms the two-dimensional mean velocity observations of the previous experimental work and shows that the vertical mean velocities are less than 10% of the local magnitudes of longitudinal velocity and hence can be ignored. Horizontal components of the mean velocity on the downstream side of the screen were relatively small, but the turbulent velocity fluctuations were two to three times as intense as those measured on the upstream side.
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Acknowledgments
The experiments of this study were conducted at the Ellerslie River Engineering Laboratory of University of Alberta, Edmonton, Canada. Funds for this study were provided by the Fisheries and Oceans Canada.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 11 • November 2010
Pages: 945 - 951
Copyright
© 2010 ASCE.
History
Received: Jun 11, 2009
Accepted: Apr 26, 2010
Published online: Apr 29, 2010
Published in print: Nov 2010
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