201• 529 • 5151www.hydroqual.com

SJR Technical Working GroupMarch 25, 2004

SJR DO Depletion ModelingProgress Update

Andy Thuman, P.E. (HydroQual)Laurie De Rosa (HydroQual)

Russ Brown, Ph.D. (Jones & Stokes)

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Modeling ApproachModeling Approach

Data compilation & review (Data Atlas)Started compiling data, atlas format – Russ Brown

DSM2-delta modeling (develops BC)Started developing BC interface

DWSC modeling (ECOMSED/RCA)Draft model grid developed

Upstream SJR modeling (DSM2-sjr)Adaptive/Corrective Management

33

HydroQual Project StatusHydroQual Project Status

Reviewing reports/data from the DWSC and in upstream SJR

Generated a draft model grid for the hydrodynamic & water quality modeling

Started linking DSM2 model output to hydrodynamic model for BC

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Preliminary Model Grid

(Entire Study Area)

Preliminary Model Grid

(Entire Study Area)

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JerseyIsland

San Joaquin River

Turner Cut

Mossdale

Vernalis

Rough & ReadyIsland

HydroQual Model Grid & DSM2 Nodes

CoastLineECOM Model Grid

# DSM2 Nodes

3 0 3 Miles

N

EW

S

55Jersey Island to Turner CutJersey Island to Turner Cut

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JerseyIsland

San Joaquin River

Turner Cut

HydroQual Model Grid& DSM2 Nodes

CoastLineECOM Model Grid

# DSM2 Nodes

N

EW

S

1 0 1 Miles

66Turner Cut to DWSCTurner Cut to DWSC

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Turner Cut

Rough & ReadyIsland

HydroQual Model Grid& DSM2 Nodes

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EW

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0.7 0 0.7 Miles

CoastLineECOM Model Grid

# DSM2 Nodes

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DWSC to VernalisDWSC to Vernalis

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Mossdale

Vernalis

Rough & ReadyIsland HydroQual Model Grid

& DSM2 Nodes

CoastLineECOM Model Grid

# DSM2 Nodes

2 0 2 Miles

N

EW

S

88

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SOD & Nutrient FluxesSOD & Nutrient Fluxes

Sediment oxygen demand (SOD)Sediment nutrient fluxes

NH3 – typically from sediment into waterPO4 – varies depending on water DO levelNO3 – typically from water into sedimentN2 – typically from sediment into water

Measured rates will be used to calibrate the sediment flux submodel

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Eutrophication: NutrientsEutrophication: Nutrients

Nitrogen

KM – mineralization rate of OrgN to NH3Knitr – nitrification rate of NH3 to NO2+NO3Kdenitr – denitr. rate of NO2+NO3 to N2 gas

Phosphorus

KM – mineralization rate of OrgP to PO4

233 NNONHOrgN denitrnitrM KKK

4POOrgP MK

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Carbon (BOD), ReaerationCarbon (BOD), Reaeration

CarbonKd – carbon (BOD) oxidation rate

ReaerationKL – oxygen transfer coefficient (L/T)Wind & velocity dependent

All rates are temperature dependent

nconsumptioOBODCarbon Kd2)(

HKK L

a

1212

Algal KineticsAlgal Kinetics

Algal growth is a function of:Temperature Available lightAvailable nutrients (NH3, NO2+NO3 & PO4)Algae produce oxygen during photosynthesis

Algal mortality occurs due to:RespirationZooplankton grazingAlgae consume oxygen during respiration

Algal death also recycles nutrients & OrgC

1313

Algal Kinetics (cont.)Algal Kinetics (cont.)

Algal growth & respiration ratesCan be estimated from light & dark bottle studies, literature, previous modeling studies, literature

Zooplankton grazing rateEstimate from zooplankton levels, model calibration

Is information available on algal species?

1414

Water Quality Model InputsWater Quality Model Inputs

Solar radiation / photoperiodMeasurements

Secchi depth / light extinctionMeasurements

Settling rates for algae, part. N/P/CLiterature, measurements, calibration

N/C, P/C, C/Chla ratios for algal kineticsLiterature, measurements, calibration

Reaction ratesLiterature, measurements, calibration

1515

Questions & AnswersQuestions & Answers