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Science on the Sandy River: Where is all the (Marmot) Dam sediment?
Part IIJohns Hopkins University
National Center for Earth-surface Dynamics (NCED)
Graham Matthews & Associates (GMA)
Introduction• Russ Plaeger – Sandy River Basin Watershed Council
• Dr. Peter Wilcock – Johns Hopkins University
Overview• Introduction
– Russ Plaeger – Sandy River Basin Watershed Council– Dr. Peter Wilcock – Johns Hopkins University– Chuck Podolak – Johns Hopkins University– Smokey Pittman – Graham Matthews and Associates
• Why we are measuring • What “ “ “• Where “ “ “• Water year 2008 - summary• Water year 2009
– Above the gorge– Below the gorge
• What’s next
Bottom Line –
big flow year, much data still to be collected, minimum major changes below the gorge
Who are we?– Johns Hopkins / NCED / GMA / SRBWC– USGS– USFS– OSU– PSU– Bureau of Reclamation– Others:
• multiple undergraduate research projects• and more…
– Assisted by:• PGE• Landowners
Why we are measuring
• Goal: Where does the Marmot Dam sediment go, and how does it affect the bed of the Sandy?– Why?
• Pools / Riffles / Eddies = fish habitat & migration paths• Pools / Eddies / Bars = recreation spots & boating routes• River bed changes can influence flooding patterns
What we are measuring• Bed at rest (summer)
What we are measuring• Bed in motion (winter)
Where we are measuringStudies concentrate on intensely measuring several sites, not entire river
Big Picture – Water Year 2008
Preliminary WY 2009• Bed in motion (winter)
– Bedload at Brightwood for WY2008 appears to have been about 22% of the load measured below the gorge
– 36,000 tons vs 160,000 tons– Samples collected above the dam (in WY2009) are
composed of 60-70% sand, while samples below the former damsite (collected in WY2008) were composed of 85-90% sand
WY 2008 - 2009
Several very large flows this winter
Preliminary WY 2009• Bed at rest (summer) Downstream of dam
675
680
685
690
695
700
705
0 50 100 150 200 250 300
2005200620072008
675
680
685
690
695
0 50 100 150 200 250
2005200620072008
Preliminary WY 2009• Bed at rest (summer) Upstream of gorge
Still very active during large storms
July 9, 2008
Preliminary WY 2009• Bed at rest (summer) Upstream of gorge
Still very active during large storms
Nov 17, 2008
Preliminary WY 2009• Bed at rest (summer) Upstream of gorge
Still very active during large storms
Jan 10, 2009
Preliminary WY 2009• Bed at rest (summer) Upstream of gorge
Still very active during large storms
July 8, 2009
Preliminary WY 2009• Bed at rest (summer) Upstream of gorge
Still very active during large storms
July 9, 2008
Preliminary WY 2009• Bed at rest (summer) Upstream of gorge
July 2009
July 2007
450
455
460
465
470
475
2005200620072008
Preliminary WY 2009• Bed at rest (summer) Downstream of gorge
fs (2ft)
0
10
20
30
40
BI MI UI Tot al
2007
2008
2009
D50 gravel (2ft)
10
100
1000
BI MI UI Tot al
2007
2008
2009
Preliminary WY 2009
• Bed at rest (summer) Downstream of gorgeJuly 2007July 2007
July 2008July 2008
July 2009July 2009
Preliminary WY 2009
Photo: fall 20062007 banks2008 banks2009 banks
Oxbow Park near Gordon Creek
Preliminary WY 2009
Photo: fall 20082009 banks
Oxbow Park near Gordon Creek
So what?• Near the dam
– large amount of deposition– still shifting– seems ‘normal’ for the Sandy
• Revenue area– some small changes in bars and texture– no ‘massive’ changes– hard to distinguish between effects of dam removal
versus large storms• Downstream (Dodge, Oxbow, Dabney, etc…)
– sand moving through – but what’s different– dynamic – but is it Marmot related?
What’s Next
• GMA survey – July 2009• DEA / PGE survey• Sediment sampling – winter 2009-2010• JHU/NCED/GMA – July 2010• Ongoing USGS / PSU work upstream
Acknowledgements• Field Assistants: Daniela Martinez, Viviano Berrios, Ramsey Coronado, Carl
Ekstrand, Michaela Long, Dajana Jurk, Cecilia Palomo, Katie Trifone, Kim Devillier, Tim Shin, Kimber Cooks, Diana Di Leonardo, Kiernan Folz Donahue, Gabriel Richarde, Jessica Roark, Kristen Sweeney
• Rose Wallick, Jon Major, Mackenzie Keith, Charlie Cannon, Rachael Peavler, Rebecca Collins – USGS
• Gordon Grant – OSU/USFS• Connie Athman - USFS• Dave Heintzman, John Esler, Tony Dentel, Tim Keller - PGE• Bill Doran – Metro Parks• Greg Stewart, Barbara Burkholder
• Funding– National Center for Earth Surface Dynamics– US Forest Service– Oregon Watershed Enhancement Board
For More• https://jshare.johnshopkins.edu/cpodola1/public_html/Website/Marmot/JHU_Marmot_
files/Podolak_Marmot_Dam_Project.html
• Chuck Podolak, Johns Hopkins– [email protected]– (208) 590-1336
• Russ Plaeger, Sandy River Basin Watershed Council– [email protected]– (503) 668-1646
• Smokey Pittman, Graham Matthews & Associates– [email protected]– (530)623-0402
