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FLOWS, FLOOD CONTROL and FISH Overview Alteration of - - PowerPoint PPT Presentation
FLOWS, FLOOD CONTROL and FISH Overview Alteration of - - PowerPoint PPT Presentation
FLOWS, FLOOD CONTROL and FISH Overview Alteration of channel-forming flows (2001-2010) Flood control reduced channel-forming days from 18 to 17 reduced the number of years with channel-forming flows from 8 of 10 to 3 of 10 years.
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Overview
- Alteration of channel-forming flows (2001-2010)
– Flood control
- reduced channel-forming days from 18 to 17
- reduced the number of years with channel-forming flows
from 8 of 10 to 3 of 10 years.
- Incubation flows & Chinook survival
– Survival and production decline with high flows
- Noisy relationships, from uncertain estimates and influences
- f other factors
– Cross-correlation makes interpretation difficult
- What is the influence of flood control vs. climate patterns?
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5000 10000 15000 20000 25000 30000 1-Nov 1-Dec 1-Jan 1-Feb
Daily Flows (cfs) Incubation (11/1-2/28) Flows at Palmer (cfs) WY2009
Without HH With HH
Rearing and Incubation Dispersal
Modified from Bunn & Arthington 2002
Refuge
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1 2 3 4 5 6 7 8 9 Total Days Actual days >8829 cfs Days >8829 cfs without flood control
Discharge level from Konrad et al. (In press)
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Puget Sound Upper Lower Middle Duwamish
Photos from Volkhardt et al.
A B C D A: Enter/leave river B: Downstream limit of spawning C: Trap location D: Upstream limit of spawning
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y = -48.53x + 618750 R² = 0.17 100,000 200,000 300,000 400,000 500,000 600,000 700,000 800,000 900,000 2000 4000 6000 8000 10000 Juvenile Chinook subyearling migrants) (above trap) Peak daily discharge (cfs) during incubation (11/1-2/28)
p = 0.20 (p = 0.18) 2009 brood/WY2010 *only 275 redds in whole mainstem
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200,000 400,000 600,000 800,000 1,000,000 Juvenile Chinook subyearling migrants (above trap) Water year (Brood year +1) Observed Predicted with flood control Predicted without flood control
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y = -502.42x + 760944 R² = 0.34 100,000 200,000 300,000 400,000 500,000 600,000 700,000 800,000 900,000 200 400 600 800 1000 1200 1400 Juvenile Chinook subyearling migrants (above trap) Median daily discharge (cfs) during incubation (11/1-2-28)
p = 0.06 (p = 0.18) 2010
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200,000 400,000 600,000 800,000 1,000,000 Juvenile Chinook subyearling migrants (above trap) Water year (Brood year + 1) Observed Predicted with flood control Predicted without flood control
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y = -6E-06x + 0.0659 R² = 0.34 0% 1% 2% 3% 4% 5% 6% 7% 2000 4000 6000 8000 10000 Survival (Pending Revision) Peak daily discharge (cfs) during incubation (11/1-2/28)
p = 0.06
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Fewer side channels? Reduced gravel? Less wood? Floodplain refuge? = long-term decline in productivity/capacity? Reduced scour depth? Reduced displacement? = Takes the ‘edge’ off high water years? Spawning/incubation Rearing & Refuge Climate variability What role does flood control play in habitat restoration?
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Summary
- Alteration of channel-forming flows (2001-2010)
– Flood control has
- reduced channel-forming days from 18 to 17
- reduced the number of years with channel-forming flows from 8 of
10 to 3 of 10 years.
- Incubation flows & Chinook survival
– Survival and production typically decline with high flows
- Other factors are at work, too.
– Cross-correlation makes interpretation difficult
- What is the influence of flood control vs. climate patterns?