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Dynamic Water Quality Model for Brewster Lake – Simulation Phase

Dynamic Water Quality Model for Brewster Lake – Simulation Phase. Sarah Brunsvold and Kasey Marley Faculty Mentor: Dr. Zuhdi Aljobeh Department of Civil Engineering Valparaiso University. Background.

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Dynamic Water Quality Model for Brewster Lake – Simulation Phase

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  1. Dynamic Water Quality Model for Brewster Lake – Simulation Phase Sarah Brunsvold and Kasey Marley Faculty Mentor: Dr. ZuhdiAljobeh Department of Civil Engineering Valparaiso University

  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 PCCI Summer 2013

  3. Objectives • Develop 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 PCCI Summer 2013

  4. Field Work • 2 cross sections • 14 water columns • 3 sampling depths N-S E-W PCCI Summer 2013

  5. Field Work • 2 cross sections • 14 water columns • 3 sampling depths PCCI Summer 2013

  6. Field Work • 2 cross sections • 14 water columns • 3 sampling depths 1 ft below surface Mid-point 1 ft above bottom PCCI Summer 2013

  7. Field Work • 2 cross sections • 14 water columns • 3 sampling depths • YSI Unit • Dissolved Oxygen • Temperature • pH • Conductivity • Water Sampler • GPS Unit PCCI Summer 2013

  8. Lab Work • 8 Parameters • Total Nitrogen • Total Phosphorus • Reactive Phosphorus • Ammonia • Nitrates • Chemical Oxygen Demand • Biochemical Oxygen Demand • Total Organic Content PCCI Summer 2013

  9. Results – E/W Field Values PCCI Summer 2013

  10. Results – E/W Lab Values PCCI Summer 2013

  11. Results – N/S Field Values PCCI Summer 2013

  12. Results – N/S Lab Values 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 measurements • Hydrodynamics – runoff, groundwater interaction, and evaporation PCCI Summer 2013

  14. Acknowledgements • Pierce Cedar Creek Institute • Dr. Hugh Brown • Mr. Matt Dykstra • Valparaiso University PCCI Summer 2013

  15. Questions? PCCI Summer 2013

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