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Dissolved Oxygen Processes

Dissolved Oxygen Processes. Processes and Equations Implemented in WASP7 Eutrophication Module. Eutrophication - DO Interactions. Detritus. Death. Phytoplankton. Periphyton. CBOD 1. Photosynthesis and Respiration. Dissolved Oxygen. Organic Decay. Dissolution. Reaereation. CBOD 2.

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Dissolved Oxygen Processes

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  1. Dissolved Oxygen Processes Processes and Equations Implemented in WASP7 Eutrophication Module WASP7 Course

  2. Eutrophication - DO Interactions

  3. Detritus Death Phytoplankton Periphyton CBOD1 Photosynthesis and Respiration Dissolved Oxygen Organic Decay Dissolution Reaereation CBOD2 Sediment Oxygen Demand CBOD3 DO Balance Processes

  4. Reaeration CO2 DO BOD1 Carbonaceous Deoxygenation Settling and Deposition of Organic Matter Sediment Sediment Oxygen Demand Streeter-Phelps with SOD

  5. Boundaries & Loads Phytoplankton Death * Carbon Content CBOD1 Periphyton Death * Carbon Content CBOD2 CBOD3 User Specifies Sources Sinks User Specifies Fraction * Detritus Dissolution Detritus Model Calculated Dissolution = Dissolution Rate * Theta ** Temp – 20 °

  6. Sources & Sinks

  7. BOD in WASP • Best to convert BOD to Ultimate BOD Values • Three BOD Classes • Fast, Medium, Slow (Labile to Refractory) • Biotic (Algae/Benthic Algae), Abiotic, WWTP • Varying Decay, F Ratios based on Sources

  8. Boundaries & Loads Phytoplankton Death * Carbon Content DO Periphyton Death * Carbon Content BOD1 BOD Decay * Theta **T-20 BOD2 BOD3

  9. CBOD

  10. Model Parameters for BOD

  11. Sediment Oxygen Demand

  12. Simulated SOD

  13. Reaeration

  14. This Sets Rate for Segment Specify Dam Characteristics This options sets the rate for the whole network User Specifies which Equation Setting to Zero WASP Selects Reaeration Options • Global Reaeration • Segment Specific Reaeration • User Defined • User Selections • Covar’s Method • Dam Reaeration

  15. Reaeration Options • Rivers & Streams • O’Connor-Dobbins • Churchill • Owens U (mps) H (m) Ka (per day)

  16. Reaeration Coefficients

  17. Dam Reaeration Where: r = ratio of deficit above and below the dam H = difference in water elevation (meters) T = water temperature (°C) a = water quality coefficient b = dam-type coefficient (Chapra, 1997)

  18. Dam Reaeration Water Quality Coefficient Dam Type Coefficients

  19. Wind Driven Reaeration Jour. of Env Eng, Vol. 109, NO.3, PP.731-752, June 1983, Author: D.J. O'Connor, TITLE: "Wind Effects on Gas- Liquid Transfer Coefficients" Wind Speed m/sec (Time Function) 10 Meters Above Water Surface Air Temperature °C (Time Function) KAWind Water Temperature °C (Segment Parameter and/or Time Function) Simulated by Hydrodynamic Model

  20. Modified Streeter-Phelps Reaeration CO2 NO3 DO CBOD1 NBOD2 Carbonaceous Deoxygenation Nitrogenous Deoxygenation Settling Settling Sediment Oxygen Demand Sediment 1 use BOD1; 2 use BOD2

  21. Nitrogenous BOD

  22. Modified Streeter-Phelps Input

  23. Temperature Dependency

  24. Linear DO Balance Reaeration NO3 CO2 Mineralization Org-N NH3 DO BOD1 Nitrification Carbonaceous Deoxygenation Phyto Photosynthesis Respiration Settling Settling SedimentOxygen Demand

  25. Linear DO Balance Input

  26. Measuring Photosynthesis & Respiration

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