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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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slide1

Laboratory research relating to large woody design

flow

Vivian Leung

University of Washington

slide2

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

slide3

Laboratory experiments

  • model of physical processes
  • controllable experiment
  • compressed time and space
slide4

Transport & Deposition of Wood

Braudrick and Grant, 2001

Bocchiola et al. 2008

slide5

Flow resistance and drag

Wallerstein et al. 2002

Wilcox and Wohl, 2006

slide6

Streambed topography around logjams

McBride and Thompson

Skalak and Pizzuto

slide7

Individual logs

Braudrick and Grant, 2000

Sawyer, Cardenas and Buttles, 2012

Leung and Montgomery

slide8

My research

  • How woody debris affects:
    • fluid flow
    • streambed morphology

How does wood shape, size and orientation affect fluid flow and streambed morphology?

slide9

Flume Setup

Stationary tree, immobile bed, no bank interactions

water surface

flow

Planform view

Side view

slide10

Experiments: Flow Visualization

Turbulent zone

Recirculation zone

flow

slide11

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

slide12

Effects of Tree Orientation

Planform View

root frontal area

turbulent zone

recirculation zone

flow

slide13

Effects of root frontal area

Planform turbulent zone [cm2]

Planform recirculation zone [cm2]

Root frontal area [cm2]

Root frontal area [cm2]

slide14

Field vs. Flume

5 cm

5 m

0.5

0

-0.5

-1

-1.5

[m]

flow

turbulent zone

recirculation zone

slide15

Key findings:

      • Roots matter.
      • Root frontal area is proportional to turbulent and recirculation zones, and scour.
slide16

Future research:

      • Sediment & water supply
      • Channel form and logjams
slide17

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.