watershed & water quality modeling technical support center wasp7 course dissolved oxygen...
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WASP7 Course
Watershed & Water Quality Modeling Technical Support CenterWatershed & Water Quality Modeling Technical Support Center
Dissolved Oxygen ProcessesDissolved Oxygen Processes
Processes and Equations Processes and Equations Implemented in WASP7 Implemented in WASP7 Eutrophication ModuleEutrophication Module
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Eutrophication - DO InteractionsEutrophication - DO Interactions
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ReaereationReaereation
CBODCBOD11CBODCBOD11
CBODCBOD22CBODCBOD22
CBODCBOD33CBODCBOD33
PhytoplanktonPhytoplanktonPhytoplanktonPhytoplankton PeriphytonPeriphytonPeriphytonPeriphyton
DissolvedDissolvedOxygenOxygenDissolvedDissolvedOxygenOxygen
SedimentSedimentOxygenOxygenDemandDemand
SedimentSedimentOxygenOxygenDemandDemand
DetritusDetritusDetritusDetritusDeathDeath
Dis
solu
tio
nD
isso
luti
on Photosynthesis and RespirationPhotosynthesis and Respiration
Organic DecayOrganic Decay
DO Balance Processes DO Balance Processes
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Streeter-Phelps with SODStreeter-Phelps with SOD
DODODODO BODBOD11BODBOD11
COCO22
ReaerationReaeration
Settling and Deposition of Settling and Deposition of Organic MatterOrganic Matter
Sediment Oxygen Sediment Oxygen DemandDemand
Carbonaceous Carbonaceous DeoxygenationDeoxygenation
Sediment
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DetritusDetritusDetritusDetritus
CBOD1
CBOD2
CBOD3
Boundaries & Loads
PhytoplanktonDeath * Carbon Content
PeriphytonDeath * Carbon Content
Fraction * Detritus Dissolution
SourcesSources SinksSinks
User Specifies
User Specifies
Model CalculatedModel Calculated
Dissolution = Dissolution Rate * Theta ** Temp – 20 Dissolution = Dissolution Rate * Theta ** Temp – 20 °°
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Sources & SinksSources & Sinks
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BOD in WASPBOD in WASP
• Best to convert BOD to Ultimate BOD Best to convert BOD to Ultimate BOD ValuesValues
• Three BOD ClassesThree BOD Classes– Fast, Medium, Slow (Labile to Refractory)– Biotic (Algae/Benthic Algae), Abiotic, WWTP– Varying Decay, F Ratios based on Sources
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BOD1BOD1BOD1BOD1
BOD2BOD2BOD2BOD2
BOD3BOD3BOD3BOD3
PhytoplanktonPhytoplanktonDeath * Carbon ContentDeath * Carbon Content
PeriphytonPeriphytonDeath * Carbon ContentDeath * Carbon Content
Boundaries & LoadsBoundaries & Loads
DODODODO
BOD Decay * Theta **BOD Decay * Theta ** T-20T-20
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CBODCBOD
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Model Parameters for BODModel Parameters for BOD
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Sediment Oxygen DemandSediment Oxygen Demand
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Simulated SODSimulated SOD
G1
G2
G3
DissolvedParticulate
Reaction Products
DissolvedParticulate
Reaction Products
Dissolved Constituent
Particulate Organic Matter
Products
ProductsReactions
Surface Exchange
Sedimentation
Diagenesis
Sedimentation
Sedimentation
Reactions
Mixing Diffusion
Net Settling
Lay
er 2
Lay
er 1
Wat
er C
olu
mn
G1
G2
G3
DissolvedParticulate
Reaction Products
DissolvedParticulate
Reaction Products
Dissolved ConstituentDissolved Constituent
Particulate Organic MatterParticulate Organic Matter
ProductsProducts
ProductsProductsReactions
Surface Exchange
Sedimentation
Diagenesis
Sedimentation
Sedimentation
Reactions
Mixing Diffusion
Net Settling
Lay
er 2
Lay
er 1
Wat
er C
olu
mn
Lay
er 2
Lay
er 1
Wat
er C
olu
mn
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WASP7 Course
ReaerationReaeration
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Reaeration OptionsReaeration Options
• Global Reaeration Global Reaeration
• Segment Specific Reaeration Segment Specific Reaeration
• User DefinedUser Defined– User Selections
• Covar’s MethodCovar’s Method
• Dam Reaeration Dam Reaeration This options sets the rate for the whole networkUser Specifies which EquationSetting to Zero WASP Selects
This Sets Rate for SegmentSpecify Dam Characteristics
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Reaeration OptionsReaeration Options
• Rivers & StreamsRivers & Streams– O’Connor-Dobbins
– Churchill
– Owens
0.5
1.53.93a
Uk
H
1.675.026a
Uk
H
0.67
1.855.32a
Uk
H
U (mps)
H (m)
Ka (per day)
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Reaeration CoefficientsReaeration Coefficients
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Dam ReaerationDam Reaeration
Where:r = ratio of deficit above and below the damH = difference in water elevation (meters)T = water temperature (°C)a = water quality coefficientb = dam-type coefficient
(Chapra, 1997)
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Dam ReaerationDam Reaeration
Polluted StatePolluted State AA
GrossGross 0.650.65
ModerateModerate 1.01.0
SlightSlight 1.61.6
CleanClean 1.81.8
Water Quality Coefficient
Dam TypeDam Type bb
Flat broad-crested regular stepFlat broad-crested regular step 0.700.70
Flat broad-crested irregular stepFlat broad-crested irregular step 0.800.80
Flat broad-crested vertical faceFlat broad-crested vertical face 0.600.60
Flat broad-crested straight-slope face Flat broad-crested straight-slope face 0.750.75
Flat broad-crested curved faceFlat broad-crested curved face 0.450.45
Round broad-crested curved faceRound broad-crested curved face 0.750.75
Sharp-crested straight slope faceSharp-crested straight slope face 1.001.00
Sharp crested vertical faceSharp crested vertical face 0.800.80
Sluice gatesSluice gates 0.050.05
Dam Type Coefficients
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Wind Driven ReaerationWind Driven Reaeration
10 Meters Above 10 Meters Above Water SurfaceWater Surface
Wind Speed m/sec (Time Function)Wind Speed m/sec (Time Function)
Air Temperature Air Temperature °C (Time Function)°C (Time Function)
Water Temperature Water Temperature °C (Segment Parameter and/or Time Function)°C (Segment Parameter and/or Time Function)Simulated by Hydrodynamic ModelSimulated by Hydrodynamic Model
Jour. of Env Eng, Vol. 109, NO.3, PP.731-752,Jour. of Env Eng, Vol. 109, NO.3, PP.731-752,June 1983, Author: D.J. O'Connor, TITLE: "Wind Effects onJune 1983, Author: D.J. O'Connor, TITLE: "Wind Effects on
Gas- Liquid Transfer Coefficients"Gas- Liquid Transfer Coefficients"
KAKAWindWind
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WASP7 Course
Modified Streeter-PhelpsModified Streeter-Phelps
DODODODO CBODCBOD11CBODCBOD11
COCO22
ReaerationReaeration
SettlingSettling
Sediment Oxygen Sediment Oxygen DemandDemand
Carbonaceous Carbonaceous DeoxygenationDeoxygenation
Sediment
NBODNBOD22NBODNBOD22
NONO33
Nitrogenous Nitrogenous DeoxygenationDeoxygenation
SettlingSettling
1 use BOD1; 2 use BOD2
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Nitrogenous BODNitrogenous BOD
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Modified Streeter-Phelps InputModified Streeter-Phelps Input
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Temperature DependencyTemperature Dependency
20 ( 20)T
TTK K
Where:Where:
KKTT The value of variable at the local temperature, T (The value of variable at the local temperature, T (°C)°C)
The value of the variable at 20 The value of the variable at 20 °C°C
ӨӨThe empirical constant for each temperature dependent system The empirical constant for each temperature dependent system variable, user specifiedvariable, user specified
20TK
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Linear DO BalanceLinear DO Balance
DODODODO BODBOD11BODBOD11
COCO22
ReaerationReaeration
SettlingSettling
SedimentSediment OxygenOxygen DemandDemand
CarbonaceousCarbonaceous DeoxygenationDeoxygenation
NHNH33NHNH33
SettlingSettling
NONO33NONO33
Org-NOrg-NOrg-NOrg-N
PhytoPhyto
PhotosynthesisPhotosynthesisRespirationRespiration
NitrificationNitrification
MineralizationMineralization
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Linear DO Balance InputLinear DO Balance Input
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