Phase I and II Channel Restoration: Summary and Lessons ... · Conclusions Habitat and Fish • A...
Transcript of Phase I and II Channel Restoration: Summary and Lessons ... · Conclusions Habitat and Fish • A...
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Photo credits, Erika Nortemann, Ellen Morris Bishop and Mark Godfrey
Phase I and II Channel Restoration: Summary and Lessons Learned
Vince & Dan Lamarra, ERI
Dave Gori, TNC
Matt Zeigler, NM Game & Fish Dept.
Michael Farrington, ASIR
© erika norteman/tnc 136N © Erika Nortemann/The Nature Conservancy © rfindling/tnc 130.7 10A © rfindling/tnc
© rfindling/tnc
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Project Objectives
• Phase I Reconnect non-flowing secondary channels to the main stem SJR (ad hoc monitoring)
• Reconnect a Complex Secondary Channel System and Measure seasonal changes in habitat features & fish abundance over 3 yrs. (Site specific integrated monitoring)
-- Measure changes in habitat features associated with environmental flow releases & large floods
-- Compare abundance of SB fish collected in different meso-habitats to determine if preferences exist in restored channels
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RERI Phase I Locations
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Channel Observation since 1993
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Restoration Success by Channel
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Historical Comparisons Channel 130 North
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Historical Comparisons Channel 130 North
660 cfs
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Historical Comparisons Channel 130 North
475 cfs
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Channel 130 North
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Historical Comparisons Channel 130 South
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Phase I Conclusions
• All restored Secondary Channels had improvements
in flow characteristics with a wide range in variability
• Channels can be engineered to flow at specific conditions
• Regardless of planning and/or engineering there is a measure of “chance” associated with the restoration success
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Phase II Restoration Stage-Flow
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Detailed Channel Flow Summer 2017
28 Days
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Reduced Channel Flow Summer 2017
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Flows @Tertiary A & B
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Secondary Channel Temperatures
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Secondary Channel Temperatures
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Channel Flow Conclusions
• The San Juan River had flows less than 475 cfs in August
and September 2017 that resulted in limited or no inflow into the channel
• The channel was flowing at 500 cfs prior to the 2017
spring runoff. Rootwad Pile was modifying inflow • Groundwater accrual may have kept the channel wet • During low flow periods, outflow temperatures were
warmer in the fall and cooler in the summer compared to the inflow temperatures
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Transects @Tertiary A & B
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Channel Profile @ Entrance (T-1)
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Stage @ Secondary Channels (T-2, T-4, & T-6)
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Channel Transect Conclusions
• The two Tertiary channels exhibited opposite trends in deposition/erosion over the three years of the study.
• The wetted channel in T-1 has remained stable but the
adjacent cobble bar has exhibited both erosion and deposition over the study period
• Two of the three main secondary channel transects have
remained neutral (T-2 and T-4) while the lowest most transect (T-6, Pit Tag) has had significant erosion and/or substrate removal
• The general pattern observed was erosion during spring
runoff followed by deposition over the summer monsoons and winter time periods
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Secondary Channel Habitats
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Secondary Channel Habitats
Runs = 80%
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Habitat Seasonal
Differences in Main
Secondary
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CO Pikeminnow Captures
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CO Pikeminnow Captures
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Secondary Channel Fish CPM Densities by Date
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Secondary Channel Fish CPM Densities by Habitat
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Secondary Channel Habitats/Fish Relationships
Phase II Main Channel: X2 = 414.6, p < 0.0001 (n=48) Phase II MC & Reference: X2 = 351.3, p < 0.0001 (n=84)
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Secondary Channel Habitats/Fish Relationships
Phase II Main Channel: X2 = 414.6, p < 0.0001 (n=48) Phase II MC & Reference: X2 = 351.3, p < 0.0001 (n=84)
>60X >6.3X >2.2X
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Secondary Channel Habitats/Fish Relationships
Phase II Main Channel: X2 = 414.6, p < 0.0001 (n=48) Phase II MC & Reference: X2 = 351.3, p < 0.0001 (n=84)
<0.2X
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Secondary Channel Habitats
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Conclusions Habitat and Fish
• A total of 84 CPM were captured in the Phase II Channel complex and the Reference Channel over the three year study
• CPM were captured in all 8 habitat categories mapped • CPM were also captured in 11 of 18 sample periods (MC and
Reference Channel) • Using the proportion of habitats sampled and capture
habitats, CPM were found in higher numbers in backwaters, embayments and slackwaters and less in runs than expected
• These “preferred” habitats were approximately 30-40% of the
habitat counts in both the Main Channel and Reference Channel
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Lessons Learned
• “KISS” Keep it Simple Stupid • “r” vs “k” site selection • Hire Paul Bunyan
• Monitoring Component is vital
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Questions?
© Patrick McCarthy/TNC © rfindling/tnc
© rfindling/tnc