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The Problem This project will test the hypothesis that appropriately scaled induced turbulence in the near and intermediate fields of hydroelectric dam forebays will attract juvenile salmonids and help guide them to surface collection entrances. Current efforts to increase downstream fish passage at hydroelectric facilities are hampered by the inability of juvenile salmonids to find fish collection entrances.
Objectives The turbulence characteristics of natural streams will be measured in the field and reproduced in portable fish raceways using small mixers and fluid jets to set the stage for juvenile salmonid swimming tests. Swim paths will be compared in the raceway with and without induced turbulence to test the project hypothesis. After optimizing the turbulence characteristics of the devices, fish swim tests will be conducted to determine if the fish follow the induced trails of turbulence. Methodology The basic methodology is to 1) create induced turbulence using either small pumps and props, 2) quantify turbulence using an acoustic Doppler velocimeter (ADV), and 3) measure fish behaviour in response to turbulence by a) using a performance-based measure such as the time taken to traverse a flume, and b) using a mechanistic-based measure such as quantifying the location and path taken by a fish with respect to the location of turbulence. Highlights and Key Findings To date, we have completed the turbulence fish experiments as identified in the objectives and methodology, but have not yet analyzed the data. Where Are We Headed In 2003 Data analysis will take place in FY03. Project Contact Dennis Rondorf Email: dennis_rondorf@usgs.gov Publications |
