SJR Technical Working Group
March 25, 2004
SJR DO Depletion Modeling
Progress Update
Andy Thuman, P.E. (HydroQual)
Laurie De Rosa (HydroQual)
Russ Brown, Ph.D. (Jones & Stokes)
201• 529 • 5151
www.hydroqual.com
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Modeling Approach
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Data compilation & review (Data Atlas)
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DSM2-delta modeling (develops BC)
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Started developing BC interface
DWSC modeling (ECOMSED/RCA)
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Started compiling data, atlas format – Russ Brown
Draft model grid developed
Upstream SJR modeling (DSM2-sjr)
Adaptive/Corrective Management
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HydroQual Project Status

Reviewing reports/data from the DWSC
and in upstream SJR
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Generated a draft model grid for the
hydrodynamic & water quality modeling
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Started linking DSM2 model output to
hydrodynamic model for BC
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HydroQual Model Grid
& DSM2 Nodes
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Preliminary
Model Grid
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Rough & Ready
Island
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(Entire Study Area)
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DSM2 Nodes
ECOM Model Grid
CoastLine
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Mossdale
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HydroQual Model Grid
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SOD & Nutrient Fluxes
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Sediment oxygen demand (SOD)
Sediment nutrient fluxes
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NH3 – typically from sediment into water
PO4 – varies depending on water DO level
NO3 – typically from water into sediment
N2 – typically from sediment into water
Measured rates will be used to calibrate
the sediment flux submodel
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Eutrophication: Nutrients

Nitrogen
nitr
denitr
M
OrgN K
NH 3 K

 NO3 K
 N 2
 KM – mineralization rate of OrgN to NH3
 Knitr – nitrification rate of NH3 to NO2+NO3
 Kdenitr – denitr. rate of NO2+NO3 to N2 gas
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Phosphorus
M
OrgP K
PO4
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KM – mineralization rate of OrgP to PO4
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Carbon (BOD), Reaeration

Carbon
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Kd – carbon (BOD) oxidation rate
Reaeration
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Kd
Carbon ( BOD ) 
O2 consumption
KL
Ka 
H
KL – oxygen transfer coefficient (L/T)
Wind & velocity dependent
All rates are temperature dependent
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Algal Kinetics
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Algal growth is a function of:
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Algal mortality occurs due to:
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Temperature
Available light
Available nutrients (NH3, NO2+NO3 & PO4)
Algae produce oxygen during photosynthesis
Respiration
Zooplankton grazing
Algae consume oxygen during respiration
Algal death also recycles nutrients & OrgC
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Algal Kinetics (cont.)
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Algal growth & respiration rates
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Zooplankton grazing rate
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Can be estimated from light & dark bottle
studies, literature, previous modeling
studies, literature
Estimate from zooplankton levels, model
calibration
Is information available on algal species?
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Water Quality Model Inputs

Solar radiation / photoperiod
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Secchi depth / light extinction
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Literature, measurements, calibration
N/C, P/C, C/Chla ratios for algal kinetics
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Measurements
Settling rates for algae, part. N/P/C
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Measurements
Literature, measurements, calibration
Reaction rates
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Literature, measurements, calibration
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Questions & Answers