Application of a Nonhydrostatic Model to Flow in a Free Surface Fish Passage Facility
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 7
Abstract
The free surface flow of two conceptual fish passage designs are investigated numerically by a level-set finite-element method. One design has a right-angled entrance from the reservoir to the fish passage chute, and the other has a curved-shaped entrance. The numerical results are validated with hydraulic experiments through comparison of the free surface location and the pressure distribution in the spillway. It is found that the right-angled design yields a curved free surface and pressure distribution in the vicinity of the entrance due to large strains, whereas the curved-shaped design yields a smooth flow transition with small strains. The negative pressure distributions near the ogee crest for both designs exhibit similar characteristics. Further downstream the free surface is elevated near the wall and is associated with counterrotating vortices. It is concluded that the curved-shaped design is favorable for fish passage because of the feature of a smooth flow transition with small strains.
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Acknowledgments
The writers acknowledge the financial support by ONR ONRN00014-01-1-0262 and Public Utility District No. 2 of Grant County, Washington State (Award No. 403-407). Discussions with Mr. Troy C. Lyons (IIHR-Hydroscience and Engineering) were very helpful in preparing this paper.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 7 • July 2008
Pages: 993 - 999
Copyright
© 2008 ASCE.
History
Received: Sep 7, 2005
Accepted: Jun 11, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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