Tidal Freshwater Delaware River
Tidal Freshwater Delaware River Dissolved Oxygen Model
PDE Science Summit 2017
Regulatory Drivers
Dissolved Oxygen 24 hr. avg. criterion • • •
Upper River (Zone 1E, 2): 5.0 mg/L Urban River (Zone 3 - upper Zone 5): 3.5 mg/L Turbidity Max. and Bay (Lower Zone 5 – Zone 6): 6.0 mg/L
1 mg/L O2 = 62.5 μM PWD Model Domain is River Miles 134 to 62
Dissolved oxygen “sag” Summer 2012 simulated
Direction of Net Transport is Right to Left
DO processes Dissolved Oxygen
Reaeration
Photosynthesis Algae Respiration
Carbon BOD
NH4 NO3 (nitrification) Sediment oxygen demand (SOD)
Light, temperature; Uptake of PO4, NH4, NO3
Algae processes Algae Organic and inorganic nutrients
Dissolved oxygen
Continuous monitors: water level, velocity, discharge, water quality Over 400 discrete inputs: • Tributaries • Municipal/industrial wastewater treatment plants • Combined sewer overflows (CSOs) • Direct runoff
Loading by source category in the model domain (River Miles 134 to 62) Carbon
0%
50%
Ammonia Tributary
Tributary
Direct Runoff
Direct Runoff
CSO
CSO
WWTP
WWTP
100%
0%
50%
Nitrate
100%
Total Phosphorus Tributary
Tributary
Direct Runoff
Direct Runoff
CSO
CSO
WWTP 0%
50%
100%
WWTP 0%
50%
100%
Water Quality Studies • • • • •
Boat run monitoring DO transects Continuous monitoring Nitrification rate measurements CBODultimate and decay rate measurements • Sediment studies • Phytoplankton taxonomy and CNP ratios
Simulated SOD 0.00 ‐0.20 60
70
80
90
100
110
120
130
140
130
140
SOD (g/m2/d)
‐0.40 ‐0.60 ‐0.80 ‐1.00 ‐1.20 ‐1.40 ‐1.60 ‐1.80
River Miles from Mouth of Bay
Nitrification Rate at 20C (1/d) Rnitm at 20c (1/d)
2 1.5 1 0.5 0 60
70
80
90
100
110
River Miles from Mouth of Bay
120
10
11
Boxplot comparison of modeled and observed DO Summer 2012
Sensitivity Analysis Change in median DO (Baseline ‐ Scenario) (mg/L)
2012 Sensitivity study (July 1 ‐ Sep 15 output) 1
0.5
0
Algae DOC decay Nitrification SOD
‐0.5
‐1
‐1.5
‐2
‐2.5
60
70
80
90
100 River Mile
110
120
Direction of Net Transport is Right to Left
130
140
Next steps • Simulate sediment diagenesis • Simulate additional algal groups • Refine loading information as it becomes available
Acknowledgments CDM Smith Sci-Tek Consultants Woods Hole Group Academy of Natural Sciences of Drexel University Chesapeake Biogeochemical Associates Tetra Tech
Still can’t get enough??? Read the full report Water Quality Model Report: http://phillywatersheds.org/doc/WQ_Model_Complete_Report_FinalDigital_WIT HAPPENDICES_WithAddendumpage_2016_09_19.pdf
PDE Science Summit 2017
Regulatory Drivers
Dissolved Oxygen 24 hr. avg. criterion • • •
Upper River (Zone 1E, 2): 5.0 mg/L Urban River (Zone 3 - upper Zone 5): 3.5 mg/L Turbidity Max. and Bay (Lower Zone 5 – Zone 6): 6.0 mg/L
1 mg/L O2 = 62.5 μM PWD Model Domain is River Miles 134 to 62
Dissolved oxygen “sag” Summer 2012 simulated
Direction of Net Transport is Right to Left
DO processes Dissolved Oxygen
Reaeration
Photosynthesis Algae Respiration
Carbon BOD
NH4 NO3 (nitrification) Sediment oxygen demand (SOD)
Light, temperature; Uptake of PO4, NH4, NO3
Algae processes Algae Organic and inorganic nutrients
Dissolved oxygen
Continuous monitors: water level, velocity, discharge, water quality Over 400 discrete inputs: • Tributaries • Municipal/industrial wastewater treatment plants • Combined sewer overflows (CSOs) • Direct runoff
Loading by source category in the model domain (River Miles 134 to 62) Carbon
0%
50%
Ammonia Tributary
Tributary
Direct Runoff
Direct Runoff
CSO
CSO
WWTP
WWTP
100%
0%
50%
Nitrate
100%
Total Phosphorus Tributary
Tributary
Direct Runoff
Direct Runoff
CSO
CSO
WWTP 0%
50%
100%
WWTP 0%
50%
100%
Water Quality Studies • • • • •
Boat run monitoring DO transects Continuous monitoring Nitrification rate measurements CBODultimate and decay rate measurements • Sediment studies • Phytoplankton taxonomy and CNP ratios
Simulated SOD 0.00 ‐0.20 60
70
80
90
100
110
120
130
140
130
140
SOD (g/m2/d)
‐0.40 ‐0.60 ‐0.80 ‐1.00 ‐1.20 ‐1.40 ‐1.60 ‐1.80
River Miles from Mouth of Bay
Nitrification Rate at 20C (1/d) Rnitm at 20c (1/d)
2 1.5 1 0.5 0 60
70
80
90
100
110
River Miles from Mouth of Bay
120
10
11
Boxplot comparison of modeled and observed DO Summer 2012
Sensitivity Analysis Change in median DO (Baseline ‐ Scenario) (mg/L)
2012 Sensitivity study (July 1 ‐ Sep 15 output) 1
0.5
0
Algae DOC decay Nitrification SOD
‐0.5
‐1
‐1.5
‐2
‐2.5
60
70
80
90
100 River Mile
110
120
Direction of Net Transport is Right to Left
130
140
Next steps • Simulate sediment diagenesis • Simulate additional algal groups • Refine loading information as it becomes available
Acknowledgments CDM Smith Sci-Tek Consultants Woods Hole Group Academy of Natural Sciences of Drexel University Chesapeake Biogeochemical Associates Tetra Tech
Still can’t get enough??? Read the full report Water Quality Model Report: http://phillywatersheds.org/doc/WQ_Model_Complete_Report_FinalDigital_WIT HAPPENDICES_WithAddendumpage_2016_09_19.pdf
