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Jennifer Lee, B.S. Harvey Mudd College Kristen Shearer, Wittenberg University

Relating Juvenile Salmonid Use and Channel Hydraulics to Full-Channel Engineered Log Jam Structures. Jennifer Lee, B.S. Harvey Mudd College Kristen Shearer, Wittenberg University John Vivio , University of California, San Diego Advisors: Matt Cox, M.S. Oregon State University

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Jennifer Lee, B.S. Harvey Mudd College Kristen Shearer, Wittenberg University

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  1. Relating Juvenile Salmonid Use and Channel Hydraulics to Full-Channel Engineered Log Jam Structures Jennifer Lee, B.S. Harvey Mudd College Kristen Shearer, Wittenberg University John Vivio, University of California, San Diego Advisors: Matt Cox, M.S. Oregon State University Desiree Tullos, Ph.D. Oregon State University Ecology Informatics Summer Institute2011

  2. Background • Spawning salmonid species in the Northwest use wood in streams for: • Obtaining food • Cover from predators • Favorable hydraulic features • Engineered Log Jams (ELJs) used to supplement natural fish habitat and livelihood in streams, and increase habitat complexity

  3. Overview • History • Purpose & Objectives • Questions • Hypotheses • Site Description • Materials & Methods • Results & Discussion • Conclusion

  4. History • Logging • Since 1800s • Decreased quantity of natural wood falling into streams • Splash dams created to transport logged wood to sawmills by raising water levels in streams • Widened channels • Scoured away accumulated sediment to expose bedrock • Eliminated natural log jams to create clear path for logs • Reduced natural habitat

  5. Splash dam at Mill Creek, Oregon, 1905

  6. History • Removal of woody debris for habitat • 1950s to 60s • Large wood thought to impede fish migration in streams • Later realized to play an important role in fish habitat and livelihood • Development of Engineered Log Jams • Endangered Species Act (1973) • Replenish lost wood back into streams

  7. Purpose • Study the effect of ELJs on • Fish behavior • Stream hydraulics • Pools and eddies • Bathymetry and channel width • Provide information for future plans to install ELJs in streams

  8. Objectives • Take velocity measurements of the stream along transects • Take bathymetry data of stream beds • Survey sites using coordinate measurements • Observe fish placement and behavior during 24-hour snorkel surveys • Combine and correlate velocity, bathymetry, and fish placement data

  9. Questions • How do streams flow near ELJs? • What kind of flow do fish prefer? • How do fish use ELJs to their advantage? • How do ELJs affect channel morphology in different systems?

  10. Hypotheses • Fish • Prefer lower flow to expend less energy • Prefer covered, deeper channels • Use log jams for shelter • Stream hydraulics • Add complexities to flow • Increase mixing of water column • Increase amount of organic material in the stream • Channel Morphology • Increased bathymetric complexity • Smaller particles accumulate near the jams

  11. Site Description:Quartz Creek Downstream Upstream

  12. Site Description:Fall Creek River Right River Left View from upstream of the log jam

  13. Site Description:Fall Creek River Left from downstream of the log jam on the gravel bar River Left from downstream of the log jam

  14. Materials & Methods:Total Station and ADCP Acoustic Doppler Current Profiler (ADCP) Total Station and prism reflector

  15. Materials & Methods:24-hour Fish Snorkel Surveys

  16. Results:Bathymetry of Quartz Creek Root Wad Logs

  17. Results:Bathymetry of Fall Creek River Left Log Jam Gravel Bar River Right Quartz Creek

  18. Results:Velocity Magnitudes of Quartz Creek Averaged Bottom

  19. Results:Bathymetry and Fish of Quartz Creek Root Wad Logs

  20. Results:Velocity Magnitudes and Fish of Quartz Creek

  21. Results: Bathymetry and Fish of Fall Creek River Left Log Jam Gravel Bar River Right

  22. Results: Bottom Velocity Magnitudes and Fish of Fall Creek River Left Log Jam Gravel Bar River Right

  23. Results: Velocity Magnitudes and Fish of Fall Creek River Left Log Jam Gravel Bar River Right Quartz Creek

  24. Conclusions • How do streams flow near ELJs? • Turbidity of water • What kind of flow do fish prefer? • Slower flow adjacent to fast flow • How do fish use ELJs to their advantage? • Increased flow complexity • Channel complexity • Cover • Spawning

  25. Conclusion • How do ELJs compare and contrast in different systems? Fall • Smaller pieces of wood • Flow splits to go either through and under or around jam • Coho was dominant Quartz • Key piece log • Flow goes through or under jam • Cutthroat was dominant

  26. Thank you to… Desiree Tullos Matt Cox Chris Gabrielli Cara Walter David Hill Roy Rivera Kate Meyer Jorge Ramirez David Noakes Ryan Couture Joseph O’Neil National Science Foundation Oregon State University US Department of Agriculture and Forestry

  27. Questions?

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