integrating aquatic nutrient and contaminant simulation ... · hydraulic modeling •dimensions:...
TRANSCRIPT
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Integrating Aquatic Nutrient and
Contaminant Simulation Modules into SWAT
Zhonglong Zhang, PhD, PE, Xinzhong Du, PhD, and Billy Johnson, PhD, PE
LimnoTech, Environmental Laboratory, ERDC,
Vicksburg, MS
2015 SWAT Conference at Purdue University
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Outline
“Plug in” water quality modules
Aquatic nutrient simulation module
Aquatic contaminant simulation module
Integrating NSM and CSM into SWAT
Model verification and evaluation
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Hydrologic and hydraulic models
• HEC-RAS
• HEC-HMS
• GSSHA
“Plug in” water quality modules
• Temperature
• Nutrients
• Contaminants
• Mercury
Dynamic linked library (dll)
Water Quality Modules
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Water Quality Modules
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HEC-RAS (River Analysis System)
HEC-RAS, Version 4.2:
• Performs 1D hydraulic
calculations for a full
network of natural and
constructed channels
• Sediment transport
• Dimension: longitudinal
HEC-RAS Version 5.0
• Adds support for 2D
hydraulic modeling
• Dimensions: longitudinal
and lateral
• 1D Water quality
modeling (temperature,
nutrients, contaminants)
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HEC-HMS (Hydrologic Modeling
System)HEC-HMS simulates the
complete hydrologic
processes of dendritic
watershed systems
Capabilities:
• Event infiltration
• Unit hydrographs
• Hydrologic routing
• Evapotranspiration
• Snowmelt
• Soil moisture accounting
• Gridded runoff simulation
• Sediment transport
• Reach water quality (NSM)
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Nutrient Simulation Module I (NSMI)
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Nutrient Simulation Module I (NSMI)
State variables (16)
• Algae (phytoplankton, benthic)
• Nitrogen (OrgN, NH4, NO3)
• Phosphorous (OrgP, TIP)
• Carbon (POC, DOC, DIC)
• Organic matter (POM, POM2)
• CBOD
• DO
• Alkalinity
• Pathogen
Derived variables
• Algal biomass
• TON, TKN, TN, DIP, TOP, TP, TOC, CBOD5
• Light attenuation, oxygen reaeration rate, pH
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SWAT- NSMI
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Contaminant Simulation Module
(CSM)
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Contaminant Simulation Module
(CSM) Multi-media kinetics
• Water column
• Underlying sediment layer
Multiple phase partitioning (equilibrium and non-equilibrium)• Water
• DOC (Dissolved Organic Carbon)
• Algae
• Organic matter
• Inorganic solids
Eight (8) biochemical transformation processes• Ionization (5 species)
• Degradation
• Hydrolysis
• Photolysis (Photodegradation)
• Volatilization
• User-defined extra reaction (second-order)
• Transformations and daughter products
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SWAT - CSM
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Model Testing and Verification -
Proof of Concept
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Nutrient Model Testing and
Verification - Proof of Concept
0
200
400
600
800
1000
1200
kg
/day
Nitrate (NO3)NO3_SWAT
NO3_NSM
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Nutrient Model Testing and
Verification - Proof of Concept
0
200
400
600
800
1000
1200
kg
/day
Dissolved Inorganic Phosphorous
SOLP_SWAT
DIP_NSM
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Nutrient Model Testing and
Verification - Proof of Concept
0
500
1000
1500
2000
2500
kg
/day
Chlorophyll-a (chla)
Chla_SWAT
Ap_NSM
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Contaminant Model Testing and
Verification - Proof of Concept
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
1/1/1993 7/20/1993 2/5/1994 8/24/1994 3/12/1995 9/28/1995 4/15/1996 11/1/1996 5/20/1997 12/6/1997
mg
/da
y
Total Pesticide
SWAT-Pesticide
CSM-CT
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Contaminant Model Testing and
Verification - Proof of Concept
0
20
40
60
80
100
120
1/1/1993 7/20/1993 2/5/1994 8/24/1994 3/12/1995 9/28/1995 4/15/1996 11/1/1996 5/20/1997 12/6/1997
mg
/da
y
Dissolved PesticideSWAT-Pesticide
CSM-Cd
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Model Testing and Verification –
Callaguas Creek Watershed
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Summary
NSM and CSM has been integrated into SWAT• Further testing and verification
• Refining model linkage
The applicability of the SWAT-NSM/CSM model
needs to be further validated/evaluated directly
against field data sets. • Callugaes Creek watershed
Documentation (report, paper).
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Questions/Comments