Location
Agriculture Science Theater, Oregon State University
Start Date
27-6-2013 11:25 AM
End Date
27-6-2013 12:00 PM
Description
Tacoma Power The Cowlitz River hosts numerous fish species including coho and Chinook salmon, steelhead and cutthroat trout. Hydroelectric dams in the Cowlitz River have significantly contributed to reduced natural salmonid populations. A surface collector built in 1996 at the Cowlitz Falls Dam aimed to help with fish restoration. Through relicensing of their hydroelectric projects on the Cowlitz Falls River, Tacoma Power had agreed to further improve fish passage at Cowlitz Falls Dam with a survival objective of 95%. A numerical study was undertaken to identify a number of different fish collection alternatives for Cowlitz Falls Dam. Forty seven simulations were completed to assess the effect of a bank-oriented surface collector on the forebay hydraulics. Different collector entrances, river flow rates and diffusion strategies were evaluated. The influence of a Behavioral Guidance Structure (BGS) and a Guide Net on the flow field were also investigated. This paper presents details of the model development and validation with field data. Forebay flow patterns for different collector designs will be presented and discussed.
Concurrent Sessions D: Downstream Migrant Surface Collectors-What Works and What Doesn't Work - Numerical Study for a Downstream Fish Collector at Cowlitz Falls Dam
Agriculture Science Theater, Oregon State University
Tacoma Power The Cowlitz River hosts numerous fish species including coho and Chinook salmon, steelhead and cutthroat trout. Hydroelectric dams in the Cowlitz River have significantly contributed to reduced natural salmonid populations. A surface collector built in 1996 at the Cowlitz Falls Dam aimed to help with fish restoration. Through relicensing of their hydroelectric projects on the Cowlitz Falls River, Tacoma Power had agreed to further improve fish passage at Cowlitz Falls Dam with a survival objective of 95%. A numerical study was undertaken to identify a number of different fish collection alternatives for Cowlitz Falls Dam. Forty seven simulations were completed to assess the effect of a bank-oriented surface collector on the forebay hydraulics. Different collector entrances, river flow rates and diffusion strategies were evaluated. The influence of a Behavioral Guidance Structure (BGS) and a Guide Net on the flow field were also investigated. This paper presents details of the model development and validation with field data. Forebay flow patterns for different collector designs will be presented and discussed.
Comments
Dr. Politano is an Associate Research Engineer at IIHR-Hydroscience &Engineering, The University of Iowa. She holds a PhD in Engineering Science from Balseiro Institute, Argentina. She has expertise in numerical modeling of rivers, tailraces, reservoirs and fish passage structures. Her background includes modeling of multiphase flows, and heat and mass transfer. She had have a lead role in over thirty projects for the power industry, including studies at Wanapum, Wells, McNary, Priest Rapids, Little Goose, Brownlee and Hells Canyon dams.