transport and fate of sediment and associated contaminants ......transport and fate of sediment and...
TRANSCRIPT
![Page 1: Transport and fate of sediment and associated contaminants ......Transport and fate of sediment and associated contaminants in SF Bay Mike Connor & John Oram 2007 LTMS Science Workshop](https://reader034.vdocument.in/reader034/viewer/2022042413/5f2d3269c1dacb3a3e1ee29d/html5/thumbnails/1.jpg)
Transport and fate of sediment and associated contaminants in SF Bay
Mike Connor & John Oram2007 LTMS
Science Workshop
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Major Points
• Bay Still Responding to 1800’s mgmt• Transport Has Spread Contamination
Widely• Future Bay Depends on Mixing of Legacy
Contaminants• Bay Sediment Ecosystem in Major
Overhaul• Overall Bay Status Assessment Will
Change with Sediment Quality Objectives
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Hydraulic Mining Dominates the Bay Sediment BudgetPracticed from 1863 – 1884, then outlawed.
>100 million m3 of sediment washed into Central Valley.Main bed sediment pulse passed Sacramento ~1950.
Channel and floodplain deposits remain. still moving thru system.
Expected response
time
Sedi
men
t yi
eld
Expected response
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Delta Sediment Inflow
Gilbert, Porterfield, Krone, OBA, McKee et al.
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Sediment Accounting 101
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Point San Pablo SSC and Mercury
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Sediment dynamics explain spatial patterns in contaminant concentrations.
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J F M A M J J A S O N DPetaluma RiverSonoma CreekBenicia surfaceBenicia bottomMallard Is surfaceGarnet Sill bottom
Tidalmax mg/L
>500300-500100-300
<100
Estuarine Turbidity Maxima
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Legacy Ratio: Reservoir/Loadings
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Contaminant Distribution Depends on Sources & Transport Processes
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Model Overview
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Model Overview
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Forecast Setup : Sedimentation
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Hindcast Results After Calibration
Error Bars:EMAP & RMP = Standard Deviation of SamplesModel = Aggregate Uncertainty
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Hindcast Results After Calibration
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Base Forecast : Recovery Due to Natural Attenuation
Net Erosional
Net Depositional
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Sensitivity to PCB ProfileBase Forecast Sensitivity
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Sensitivity to PCB ProfileBase Forecast Sensitivity
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Sensitivity to PCB ProfileBase Forecast Sensitivity
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Sensitivity to PCB ProfileBase Forecast Sensitivity
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Loading Scenarios : Local Tributary Loads
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Loading Scenarios : No External Loads
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Changing Bay Sediment Ecosystem
• Sediment Supply• Invasive Species• Light Penetration• Bathymetry• Erosional Processes• Biological Structure
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0
10
20
30
Chl
orop
hyll
a (m
g/m
3 )
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2
4
6
8
Chl
orop
hyll
a (m
g/m
3 )
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
Autumn-winter blooms appear in 1999
Interquartile Ranges ShowOverall Trends of IncreasingChla during autumn-winter
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Future (~2030)Present (~2000)
••13,000 acres 13,000 acres restoredrestored
••35,000 more in 35,000 more in the worksthe works
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Few Eelgrass Beds Remaining in Bay
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Current Shoreline
Future Shoreline?
1 m Sea Level Rise Area
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Nontoxic: Response not substantially different from that expected in sediments that are uncontaminated and have optimum characteristics for the test species (e.g., control sediments)
Low toxicity: A response that is of relatively low magnitude; the response may not be greater than test variability
Moderate toxicity: High confidence that a statistically significant toxic effect is present
High toxicity: High confidence that a toxic effect is present and the magnitude of response includes the strongest effects observed for the test
Toxicity Categories
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Amphipod Species RecommendationsAmphipod Species Recommendations
Recommended– Eohaustorius estuarius– Leptocheirus plumulosus
Not recommended– Ampelisca abdita
• Low sensitivity• Low test success rate
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Benthic Effects
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Chemical Exposure
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Multiple Level of Effects (MLOE)
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Major Points
• Bay Still Responding to 1800’s mgmt• Transport Has Spread Contamination
Widely• Future Bay Depends on Mixing of Legacy
Contaminants• Bay Sediment Ecosystem in Major
Overhaul• Overall Bay Status Assessment Will
Change with Sediment Quality Objectives