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WLRD Science Seminar
Sammamish River Water Quality Model Status Report
November 19, 2002
Sammamish-Washington Analysis and Modeling Program
Sammamish River Model
CE-QUAL-W2 Model
• 2-D model
• Laterally averaged
• No zooplankton, macrophytes, sediment diagenesis
• Epiphyton and riparian shade model added recently
Model Calibration
Railroad Bridge
0
5
10
15
20
25
6/1/99 7/1/99 7/31/99 8/30/99 9/29/99 10/29/99
Date
Tem
pe
ratu
re (
oC
)
Observed Modeled
Model Calibration
Willows Run (51N)
0
5
10
15
20
25
4/30/99 5/30/99 6/29/99 7/29/99 8/28/99 9/27/99 10/27/99
Date
Tem
pe
ratu
re (
oC
)
Observed Modeled
Model CalibrationNE 116th Street Bridge
0
5
10
15
20
25
6/1/99 7/1/99 7/31/99 8/30/99 9/29/99 10/29/99
Date
Tem
per
atu
re (
oC
)
Observed Modeled
Model Calibration
NE 124th Street Bridge
0
5
10
15
20
25
6/1/99 7/1/99 7/31/99 8/30/99 9/29/99 10/29/99
Date
Tem
pe
ratu
re (
oC
)
Observed Modeled
Model Calibration
NE 145th Street Bridge
0
5
10
15
20
25
6/1/99 7/1/99 7/31/99 8/30/99 9/29/99 10/29/99
Date
Tem
pe
ratu
re (
oC
)
Observed Modeled
Model CalibrationBlyth Park
0
5
10
15
20
25
6/1/99 7/1/99 7/31/99 8/30/99 9/29/99 10/29/99
Date
Tem
per
atu
re (
oC
)
Observed Modeled
Figure 2. Sammamish River mainstem thermistor data.
Date
11/1/2001 12/1/2001 1/1/2002 2/1/2002 3/1/2002 4/1/2002 5/1/2002 6/1/2002 7/1/2002 8/1/2002 9/1/2002 10/1/2002
Tem
pera
ture
(oC
)
0
5
10
15
20
25
30
Redmond Rowing ClubRedmond Railroad Bridge145th Ave BridgeWoodinville Railroad BridgeI-405 Bridge
Ongoing Temperature Monitoring
Ongoing Water Surface Profiling
Sammamish R. water surface profile
0
5
10
15
20
25
30
0 10000 20000 30000 40000 50000 60000
Approx. Distance along river
Wa
ter
Su
rfa
ce E
lev
ati
on
(ft
, N
GV
D)
5/31/2001
8/2/2001
10/4/01
12/3/2001
bed
4/1/02
1/30/02
Shade Inputs
Water Quality Model Development
Water Quality Locators >=Year
2000
Water Quality Model Boundary Conditions
NORTH CREEK TOTAL PHOSPHORUS DATA
DATE
8/1/2000 12/1/2000 4/1/2001 8/1/2001
TO
TA
L P
HO
SP
HO
RU
S (
µg
/L)
0
50
100
150
200
250
300
Routine (monthly)
NORTH CREEK TOTAL PHOSPHORUS DATA
DATE
8/1/2000 12/1/2000 4/1/2001 8/1/2001
TO
TA
L P
HO
SP
HO
RU
S (
µg
/L)
0
50
100
150
200
250
300
Routine (monthly)Routine (interpolated)
NORTH CREEK TOTAL PHOSPHORUS DATA
DATE
8/1/2000 12/1/2000 4/1/2001 8/1/2001
TO
TA
L P
HO
SP
HO
RU
S (
µg
/L)
0
50
100
150
200
250
300
Routine (monthly)+Storms
NORTH CREEK TOTAL PHOSPHORUS DATA
DATE
8/1/2000 12/1/2000 4/1/2001 8/1/2001
TO
TA
L P
HO
SP
HO
RU
S (
µg
/L)
0
50
100
150
200
250
300
Routine (monthly)Routine+Storms
NORTH CREEK TOTAL PHOSPHORUS DATA
DATE
8/1/2000 12/1/2000 4/1/2001 8/1/2001
TO
TA
L P
HO
SP
HO
RU
S (
µg
/L)
0
50
100
150
200
250
300
Routine (monthly)+StormsDaily
NORTH CREEK SOLUBLE REACTIVE PHOSPHORUS DATA
DATE
8/1/2000 12/1/2000 4/1/2001 8/1/2001
SR
P (
µg
/L)
0
50
100
150
200
250
300
Routine+StormsWeekly
Sammamish River at Bothell (08B070)
02
46
810
1214
01-Jan-99 20-Feb-99 11-Apr-99 31-May-99 20-Jul-99 08-Sep-99 28-Oct-99 17-Dec-99
Date
Dis
solv
ed O
xyg
en
(mg
/L)
Observed Modeled
Sammamish River at Kenmore (0450)
02
468
10
1214
01-Jan-99 20-Feb-99 11-Apr-99 31-May-99 20-Jul-99 08-Sep-99 28-Oct-99 17-Dec-99
Date
Dis
solv
ed O
xyg
en
(mg
/L)
Observed Modeled
Water Quality Model Results
Water Quality Model Diurnal DO and pH
Fluctuations
pH
8/7/00 00:00 8/21/00 00:00 9/4/00 00:00 9/18/00 00:00
pH
7.0
7.2
7.4
7.6
7.8
8.0
8.2
Dissolved Oxygen Concentration
8/7/00 00:00 8/21/00 00:00 9/4/00 00:00 9/18/00 00:00
DO
(m
g/L
)
02468
101214
Redmond Railroad Bridge
Dissolved Oxygen Saturation
8/7/00 00:00 8/21/00 00:00 9/4/00 00:00 9/18/00 00:00
DO
% s
at.
020406080
100120140
Redmond Rowing ClubRedmond Railroad Bridge116th Avenue BridgeBig Bear Creek near Mouth
pH
8/5/02 00:00 8/19/02 00:00 9/2/02 00:00 9/16/02 00:00
pH
6.5
7.0
7.5
8.0
8.5
9.0Noted drift of pH probe at Redmond Rowing Club
Deployment at:Redmond Rowing Club
Deployment at:Redmond Rowing Club116th Ave Bridge
Deployment at:Redmond Rowing ClubRedmond Railroad Bridge
Deployment at:Redmond Rowing ClubBig Bear Creek near mouthRedmond Railroad Bridge
Dissolved Oxygen Concentration
8/5/02 00:00 8/19/02 00:00 9/2/02 00:00 9/16/02 00:00
DO
(m
g/L
)
02468
101214
Dissolved Oxygen Saturation
8/5/02 00:00 8/19/02 00:00 9/2/02 00:00 9/16/02 00:00
DO
% s
at.
020406080
100120140
pH
8/2/99 00:00 8/16/99 00:00 8/30/99 00:00 9/13/99 00:00 9/27/99 00:00
pH
6.5
7.0
7.5
8.0
8.5
9.0
Dissolved Oxygen Saturation
8/2/99 00:00 8/16/99 00:00 8/30/99 00:00 9/13/99 00:00 9/27/99 00:00
DO
% s
at.
020406080
100120140
Observed at MarymoorModeled at Redmond Railroad Bridge
pH
8/2/99 00:00 8/16/99 00:00 8/30/99 00:00 9/13/99 00:00 9/27/99 00:00
pH
6.5
7.0
7.5
8.0
8.5
9.0
Dissolved Oxygen Saturation
8/2/99 00:00 8/16/99 00:00 8/30/99 00:00 9/13/99 00:00 9/27/99 00:00
DO
% s
at.
020406080
100120140
Observed at MarymoorModeled at Redmond Railroad BridgeRedmond Railroad Bridge 2000Redmond Railroad Bridge 2002
pH
8/2/99 00:00 8/16/99 00:00 8/30/99 00:00 9/13/99 00:00 9/27/99 00:00
pH
6.5
7.0
7.5
8.0
8.5
9.0
Dissolved Oxygen Saturation
8/2/99 00:00 8/16/99 00:00 8/30/99 00:00 9/13/99 00:00 9/27/99 00:00
DO
% s
at.
020406080
100120140
Observed at MarymoorModeled at Redmond Railroad BridgeRedmond Railroad Bridge 2000Redmond Railroad Bridge 2002
Recommendations
• Groundwater data collection
• Ungaged tributary input refinement
• River water surface elevations/travel time studies
• Mainstem river temperature data collection
• Additional mainstem water quality stations including storm sampling and chl a meas.
• Tributary organic carbon monitoring
• Continuous DO/pH monitoring
Model Calibration Steps
• Water Balance/Hydraulics• Temperature• Water quality
– Conservative constituents– Nutrients– DO/pH– Light penetration– Phytoplankton
• Revisit temperature and repeat water quality
Model State Variables
• Total dissolved solids• Multiple arbitrary
constituents– Conservative tracer
– Residence time
– Indicator bacteria
• Ammonium• Nitrate• Dissolved inorganic P• Dissolved silica• Particulate biogenic silica
• Multiple inorganic suspended solids
• Total iron• Labile DOM• Refractory DOM• Labile POM• Refractory POM• Multiple CBOD groups• Multiple algal groups• Dissolved oxygen• Total inorganic carbon• Alkalinity
Model Derived Variables
• Total, dissolved, and particulate organic carbon
• Total, dissolved, and particulate organic nitrogen
• Total Kjedahl nitrogen• Total nitrogen• Total, dissolved, and
particulate organic P• Total suspended solids• Total inorganic suspended
solids
• Dissolved oxygen saturation• Algal production• Chlorophyll a• Total algal biomass• pH• Carbon dioxide• Bicarbonate• Carbonate
Hydrodynamic Output• Horizontal and vertical
velocity• Temperature• Density• Vertical eddy viscosity• Vertical shear stress• Advection of vertical
momentum• Advection of
longitudinal momentum
• Longitudinal momentum• Horizontal density gradient• Horizontal pressure gradient• Shear at top of layer• Shear at the bottom of layer• Gravity term due to channel
slope
Model Data Needs
• Channel cross sections/bathymetry• Meteorology (air temp, dew point, wind,
clouds, observed solar radiation)• Measured tributary inflow quantity and
quality• Unmeasured (including gw?) inflow
quantity and quality• Calibration data (quantity/quality)
Water Quality Boundary Conditions
• TDS = 0.55 x Spec. Cond.• Dissolved silica = 7.2 mg/L• Particulate biogenic silica = 2.0 mg/L• Ammonium, nitrate, diss. P from observations• TIC from pH and alkalinity measurements• Inorganic suspended solids = TSS - POM*
* POM = Particulate organic matter …but organic carbon concentration not measured
Water Quality Boundary Conditions
• Assume tributary TOC = 5 mg/L• Assume 40 % of organic matter is carbon• Assume 90 % of TOC is dissolved• Assume 30 % of TOC is labile• Therefore:
– LDOM = TOC x 2.5 x 0.9 x 0.3– RDOM = TOC x 2.5 x 0.9 x 0.7– LPOM = TOC x 2.5 x 0.1 x 0.3– RPOM = TOC x 2.5 x 0.1 x 0.7
Water Quality Boundary Conditions
• Assume three algal groups (diatoms, greens, blue-greens) for initial modeling
• Assume algae contributed only at the upstream boundary with Lake Sammamish
• Assume conversion of chlorophyll a to algal biomass (mg/L) = chl a (µg/L) x 0.065
• Assume fraction of influent algal biomass that is: Diatoms = 0.5
Greens = 0.3Blue-greens = 0.2
