In-Delta Storage Program Water Quality Field Investigations Stakeholders Committee Meeting January...
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In-Delta Storage ProgramWater Quality
Field Investigations
Stakeholders Committee MeetingJanuary 22, 2003
Robert DuVall
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• Overview of field studiesOverview of field studies
• Organic carbon loading algorithmOrganic carbon loading algorithm
• Next stepsNext steps
OutlineOutline
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Water Quality Studies Conducted:Water Quality Studies Conducted:
1999199920002000
200220022003200320042004
Multi-year, long term studiesMulti-year, long term studies
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1999 and 2000 studies focused on peat soil
2002 and 2003 studies included biological productivity
mesocosms or physical models of thereservoir islands
one soil depth (0.5 m or 1.5 feet)two water depths (4 and 8 feet)four reps and a river water control tank
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Bioproductivity in one of the tanks
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collected soil from Bacon Island March 5, 2002
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added 1.5’ soil then Sacramento River water onMarch 12, 2002
maintained 4’ and 8’ depth with river water
drained reservoirs August 7, 2002 to a maintained1’ depth
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added Egeria fragments to each tank
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added fish to each tank
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Water Sampling
• THMFP, TOC and DOC• Temperature, DO, pH and secchi depth• Total and dissolved nutrients• Total mercury• Turbidity and UV absorbance @ 254nm• Chlorophyll a and pheophytin a• Zooplankton and phytoplankton• Macrophytes and fish
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this photo seven weeks post-filling
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tanks drained July 30 through August 7simulating reservoir releases
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inside of “drained reservoir” short tank
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tall tank
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river watercontrol tank
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Carbon Loading Algorithm
• Old logic based on fitting a logistic equation to tank data
• New studies are focused on ecological processes and mechanisms
• Looking at different loading sources and different loading rates over time
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For example, abiotic leaching may at times be the dominant source of loading and driven by temperature.
Other factors, such as algal blooms or vascular plant decomposition may play important roles at different times.
These and other questions are being addressed through integration of field experiments and modeling.
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Next Steps
• Simulate flow through operations• Use knowledge gained from field
studies and modeling to manage or avoid water quality problems
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0123456789
5-Nov 13-Feb 24-May 1-Sep 10-Dec 20-Mar
DO
C m
g/L
• Use field studies to develop logic in DSM2 and CALSIM• Simulate flow through operations• Better evaluate water quality effects and project yield