Case Study of an Application of a Computational Fluid Dynamics Model to the Forebay of the Dalles Dam, Oregon
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 5
Abstract
A proposal for facilitating the downstream migration of juvenile fish at The Dalles Dam, Ore. calls for blocking the upper of turbine intakes by J-shaped steel panels (blocked trashracks). These trashracks are expected to reduce velocity near the powerhouse that is responsible for entraining juveniles into the turbine intake flow. A three-dimensional computational fluid dynamics model was used to investigate the forebay hydraulics for the existing and proposed configurations of the intakes. Velocity data from a 1:40 scale physical model and a field program were utilized for model validation. In general, agreements between computed velocities and data were within the variability of field measurements. The model results confirmed the development of low velocity zones adjacent to the powerhouse. Further, the flow field created by the proposed trashracks could aid juveniles in swimming to the downstream end of the powerhouse where the fish bypass system is located.
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Acknowledgments
The work described in this paper was conducted by ENSR, Redmond, Wash. for the USACE, Portland District. The writers acknowledge the help and cooperation of the District in conducting this study. The views and opinions expressed in this paper do not necessarily state or reflect those of the USACE.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 5 • May 2008
Pages: 509 - 519
Copyright
© 2008 ASCE.
History
Received: Apr 11, 2002
Accepted: Aug 14, 2007
Published online: May 1, 2008
Published in print: May 2008
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