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Laboratory research relating to large woody design

Laboratory research relating to large woody design. flow. Vivian Leung University of Washington. Designing with large woody debris. http://foreignwaters.blogspot.com/2007_08_01_archive.html. photo courtesy of Andy Ritchie. Abbe, T. B., and Montgomery, D. R 2003. Laboratory experiments

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Laboratory research relating to large woody design

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  1. Laboratory research relating to large woody design flow Vivian Leung University of Washington

  2. Designing with large woody debris http://foreignwaters.blogspot.com/2007_08_01_archive.html photo courtesy of Andy Ritchie Abbe, T. B., and Montgomery, D. R 2003

  3. Laboratory experiments • model of physical processes • controllable experiment • compressed time and space

  4. Transport & Deposition of Wood Braudrick and Grant, 2001 Bocchiola et al. 2008

  5. Flow resistance and drag Wallerstein et al. 2002 Wilcox and Wohl, 2006

  6. Streambed topography around logjams McBride and Thompson Skalak and Pizzuto

  7. Individual logs Braudrick and Grant, 2000 Sawyer, Cardenas and Buttles, 2012 Leung and Montgomery

  8. My research • How woody debris affects: • fluid flow • streambed morphology How does wood shape, size and orientation affect fluid flow and streambed morphology?

  9. Flume Setup Stationary tree, immobile bed, no bank interactions water surface flow Planform view Side view

  10. Experiments: Flow Visualization Turbulent zone Recirculation zone flow

  11. Effects of Root Shape and blockage area Partially Buried Roots Wire Mesh Roots Star Shaped Roots Circular Roots No Roots flow turbulent zone recirculation zone Increasing blockage area

  12. Effects of Tree Orientation Planform View root frontal area turbulent zone recirculation zone flow

  13. Effects of root frontal area Planform turbulent zone [cm2] Planform recirculation zone [cm2] Root frontal area [cm2] Root frontal area [cm2]

  14. Field vs. Flume 5 cm 5 m 0.5 0 -0.5 -1 -1.5 [m] flow turbulent zone recirculation zone

  15. Key findings: • Roots matter. • Root frontal area is proportional to turbulent and recirculation zones, and scour.

  16. Future research: • Sediment & water supply • Channel form and logjams

  17. This research is supported in part by: Special thanks to my advisor, Dave Montgomery. Thanks also to Peter Rhines, Eric Lindahl, Bob Koon, Emily Carrington and Sarah Johnson for experimental support; and Chris Paola and Joel Johnson.

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