sarah brunsvold and kasey marley faculty mentor: dr. zuhdi aljobeh department of civil engineering...
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Dynamic Water Quality Model for Brewster Lake
– Simulation Phase
Sarah Brunsvold and Kasey MarleyFaculty Mentor: Dr. Zuhdi Aljobeh
Department of Civil EngineeringValparaiso University
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PCCI Summer 2013 2
Background A dynamic model can be used to predict the
water quality of Brewster Lake over time for different conditions
It will help PCCI staff in making decisions about the conservation and preservation of the lake and its watershed
This research is a continuation of last summer’s limited dissolved oxygen model developed by Argueta and Aljobeh
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PCCI Summer 2013 3
ObjectivesDevelop a dynamic water
quality model for Brewster Lake based on:Mathematical equations
representing the lake’s water quality
The lake’s watershed hydrodynamics
The lake’s water chemical and biological analyses
Compare the water quality of Brewster Lake with similar-sized lakes in the area
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PCCI Summer 2013 4
Field Work2 cross sections 14 water columns3 sampling depths
N-S
E-W
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PCCI Summer 2013 5
Field Work2 cross sections 14 water columns3 sampling depths
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PCCI Summer 2013 6
Field Work2 cross sections14 water columns3 sampling depths
1 ft below surface
1 ft above bottom
Mid-point
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PCCI Summer 2013 7
Field Work2 cross sections14 water columns3 sampling depths
YSI UnitDissolved OxygenTemperaturepHConductivity
Water SamplerGPS Unit
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PCCI Summer 2013 8
Lab Work8 Parameters
Total Nitrogen Total PhosphorusReactive PhosphorusAmmoniaNitratesChemical Oxygen
DemandBiochemical Oxygen
DemandTotal Organic Content
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PCCI Summer 2013 9
Results – E/W Field Values
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PCCI Summer 2013 10
Results – E/W Lab Values
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PCCI Summer 2013 11
Results – N/S Field Values
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PCCI Summer 2013 12
Results – N/S Lab Values
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PCCI Summer 2013 13
What’s Next?These results will be used as part of the finite
element solution of the model - the initial conditions
A second round of sampling will be conducted by the end of July
These new results will be used to calibrate the model and correct any errors
Need to collect boundary condition measurementsHydrodynamics – runoff, groundwater
interaction, and evaporation
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PCCI Summer 2013 14
AcknowledgementsPierce Cedar Creek InstituteDr. Hugh BrownMr. Matt DykstraValparaiso University
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PCCI Summer 2013 15
Questions?