Simulation of Hydrodynamics and Solute Transport in the Suwannee River Estuary, Florida
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Transcript of Simulation of Hydrodynamics and Solute Transport in the Suwannee River Estuary, Florida
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Simulation of Hydrodynamics and Simulation of Hydrodynamics and
Solute Transport in the Solute Transport in the
Suwannee River Estuary, FloridaSuwannee River Estuary, Florida
Jerad BalesJerad BalesU.S. Geological SurveyU.S. Geological Survey
Raleigh, NCRaleigh, NC
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Study ObjectivesStudy Objectives• Characterize hydrologic
and salinity conditions in Suwannee River Estuary
• Develop, calibrate, and document 3-dimensional unsteady flow and salt transport model.
• Provide tool for further applications in Suwannee River Estuary and offshore.
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Continuous Data Collection in EstuaryContinuous Data Collection in Estuary
FlowFlow SalinitySalinity Water Water LevelLevel
SalinitySalinityWater Water LevelLevel
3 km offshore3 km offshore
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0.35 in 2000 compared to 0.45 in 1955
0.27 in 2000 compared to 0.25 in 1955
Flows During Data-Collection PeriodFlows During Data-Collection Period
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Suwannee River Estuary Net FlowsSuwannee River Estuary Net Flows
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Buoy #1 W4 G1River Fork
E6W1 W6 W7 W8WPWM
W5
7/27/00 10:40 – 11:33
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Buoy #1 W4 G1River Fork
E6W1 W6 W7 W8WPWM
W5
7/27/00 18:35 – 19:54
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Suwannee River Estuary Model:Suwannee River Estuary Model:A Salinity Prediction ToolA Salinity Prediction Tool
• How can the effects of changes in How can the effects of changes in river flow be separated from all of the river flow be separated from all of the other factors affecting salinity in the other factors affecting salinity in the Suwannee?Suwannee?DataData--no experiments --no experiments --natural variability is great--natural variability is great
Statistical techniquesStatistical techniques--many factors--many factors
Computer modelComputer model--captures most relevant--captures most relevant natural processes.natural processes.
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Computational Grid and BoundariesComputational Grid and Boundaries
Upstream boundary: AGRMeasured flow, zero salinity
Ocean boundary: ~20 kmTides from Cedar Key, Salinity = 35 psuDepth = 8-9 meters
Tidal boundary: Cedar KeyTides from Cedar Key;Estimated constant salinity
Tidal boundary: Horseshoe Pt.Tides from Cedar Key;Estimated constant salinity
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Some Results
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Opportunities and NeedsOpportunities and Needs
• Opportunities with existing modelOpportunities with existing modelEvaluate effects of flow changes on salinity Evaluate effects of flow changes on salinity
distribution (time and space) in estuary and offshore.distribution (time and space) in estuary and offshore.Simulate movement of neutrally buoyant material Simulate movement of neutrally buoyant material
(perhaps larvae?)(perhaps larvae?)
• NeedsNeedsIncreased spatial resolution near shore, including Increased spatial resolution near shore, including
tidal creeks, marshes, and offshore reefs.tidal creeks, marshes, and offshore reefs.Ground water inputs.Ground water inputs.Better seaward salinity boundary conditionBetter seaward salinity boundary conditionNutrient transport.Nutrient transport.
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For Additional InformationFor Additional Information
Jerad BalesU.S. Geological [email protected]
919-571-4048
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Data CollectionData Collection
•StreamflowStreamflow•WindWind•Water LevelWater Level
•SalinitySalinity•VelocityVelocity•BathymetryBathymetry
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Calculation of Net Freshwater Flow at East PassCalculation of Net Freshwater Flow at East Pass
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FlowFlowdistributiodistributio
nnon falling on falling
tidetide
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Flow Flow distributiodistributio
nnon rising on rising
tidetide
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EFDC--Rationale for SelectionEFDC--Rationale for Selection
• Scientifically robust.Scientifically robust.
• Public domain--available to SRWMD.Public domain--available to SRWMD.
• Good documentation.Good documentation.
• Supported by EPA.Supported by EPA.
• Used successfully by SJRWMD and Used successfully by SJRWMD and SFWMD.SFWMD.
• Water-quality simulation capabilities.Water-quality simulation capabilities.