SCIENCE LEARNINGS PAGE

TBD

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• AMWG feb 13 USBR Link]

1. Bar building not directly linked with sand concentrations as hypothesized
2. Long-Term average size of sand deposits along the channel margin depends on how much deposition occurs during each flood, how much erosion occurs between each flood, and how frequently the floods occur.
3. Concentrations of suspended sand less than anticipated, due to (prior) equalization flows.
4. 2012 flood resulted in sandbar building, similar to observations in previous controlled floods.
5. (2012 HFE) Bar building not as widespread as 2008.

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• http://www.usbr.gov/uc/rm/amp/amwg/mtgs/13feb20/Attach_07b.pdf

1. For every 1 degree increase in temperature, predation vulnerability of HBC is decreased by about 5%. (Lab results for RBT predation on HBC- Preliminary data from Ward 2013, Unpublished)
2. Glen Canyon food web appears less resistant to perturbation (anxiety or uneasiness) than Grand Canyon food webs. [Food web response to 2008 HFE- Preliminary Data from Kennedy- 2013, unpublished]
3. Glen Canyon food web appears relatively unstable.
4. Without changes in food web structure (i.e.,more diverse invertebrate assemblage), RBT populations may continue to fluctuate through time.
5. Benthic density and discharge both affect drift densities in Glen Canyon [Caveats: Only short-term effects evaluated discharge -hours to days & Longer-time scales (weeks to months) could yield different results]