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Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dissolved Oxygen Processes Processes and Equations Implemented in WASP7 Eutrophication.

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Presentation on theme: "Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dissolved Oxygen Processes Processes and Equations Implemented in WASP7 Eutrophication."— Presentation transcript:

1 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dissolved Oxygen Processes Processes and Equations Implemented in WASP7 Eutrophication Module

2 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Eutrophication - DO Interactions

3 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaereation CBOD 1 CBOD 2 CBOD 3 PhytoplanktonPhytoplanktonPeriphytonPeriphyton DissolvedOxygenDissolvedOxygen SedimentOxygenDemandSedimentOxygenDemand DetritusDetritusDeathDissolution Photosynthesis and Respiration Organic Decay DO Balance Processes

4 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Streeter-Phelps with SOD DODO BOD 1 CO 2 Reaeration Settling and Deposition of Organic Matter Sediment Oxygen Demand CarbonaceousDeoxygenation Sediment

5 Watershed & Water Quality Modeling Technical Support Center WASP7 Course DetritusDetritus CBOD1 CBOD2 CBOD3 Boundaries & Loads Phytoplankton Death * Carbon Content Periphyton Death * Carbon Content Fraction * Detritus Dissolution SourcesSinks User Specifies Model Calculated Dissolution = Dissolution Rate * Theta ** Temp – 20 °

6 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Sources & Sinks

7 Watershed & Water Quality Modeling Technical Support Center WASP7 Course BOD in WASP Best to convert BOD to Ultimate BOD ValuesBest to convert BOD to Ultimate BOD Values Three BOD ClassesThree BOD Classes –Fast, Medium, Slow (Labile to Refractory) –Biotic (Algae/Benthic Algae), Abiotic, WWTP –Varying Decay, F Ratios based on Sources

8 Watershed & Water Quality Modeling Technical Support Center WASP7 Course BOD1BOD1 BOD2BOD2 BOD3BOD3Phytoplankton Death * Carbon Content Periphyton Boundaries & Loads DODO BOD Decay * Theta **T-20 BOD Decay * Theta ** T-20

9 Watershed & Water Quality Modeling Technical Support Center WASP7 Course CBOD

10 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Model Parameters for BOD

11 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Sediment Oxygen Demand

12 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Simulated SOD

13 Watershed & Water Quality Modeling Technical Support Center WASP7 CourseReaeration

14 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaeration Options Global ReaerationGlobal Reaeration Segment Specific ReaerationSegment Specific Reaeration User DefinedUser Defined –User Selections Covar’s MethodCovar’s Method Dam ReaerationDam Reaeration This options sets the rate for the whole networkUser Specifies which EquationSetting to Zero WASP Selects This Sets Rate for Segment Specify Dam Characteristics

15 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaeration Options Rivers & StreamsRivers & Streams –O’Connor-Dobbins –Churchill –Owens U (mps) H (m) Ka (per day)

16 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaeration Coefficients

17 Watershed & Water Quality Modeling Technical Support Center WASP7 Course 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 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dam Reaeration Polluted State A Gross0.65 Moderate1.0 Slight1.6 Clean1.8 Water Quality Coefficient Dam Type b Flat broad-crested regular step 0.70 Flat broad-crested irregular step 0.80 Flat broad-crested vertical face 0.60 Flat broad-crested straight-slope face 0.75 Flat broad-crested curved face 0.45 Round broad-crested curved face 0.75 Sharp-crested straight slope face 1.00 Sharp crested vertical face 0.80 Sluice gates 0.05 Dam Type Coefficients

19 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Wind Driven Reaeration 10 Meters Above Water Surface Wind Speed m/sec (Time Function) Air Temperature °C (Time Function) Water Temperature °C (Segment Parameter and/or Time Function) Simulated by Hydrodynamic Model Jour. of Env Eng, Vol. 109, NO.3, PP , June 1983, Author: D.J. O'Connor, TITLE: "Wind Effects on Gas- Liquid Transfer Coefficients" KA Wind

20 Watershed & Water Quality Modeling Technical Support Center WASP7 Course

21 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Modified Streeter-Phelps DODO CBOD 1 CO 2 Reaeration Settling Sediment Oxygen Demand CarbonaceousDeoxygenation Sediment NBOD 2 NO 3 NitrogenousDeoxygenation Settling 1 use BOD1; 2 use BOD2

22 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Nitrogenous BOD

23 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Modified Streeter-Phelps Input

24 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Temperature Dependency Where: KTKTKTKT The value of variable at the local temperature, T (°C) The value of the variable at 20 °C Ө The empirical constant for each temperature dependent system variable, user specified

25 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Linear DO Balance DODO BOD 1 CO 2 Reaeration Settling Sediment Oxygen Demand CarbonaceousDeoxygenation NH 3 Settling NO 3 Org-NOrg-N Phyto PhotosynthesisRespiration Nitrification Mineralization

26 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Linear DO Balance Input

27 Watershed & Water Quality Modeling Technical Support Center WASP7 Course Measuring Photosynthesis & Respiration


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