WLRD Science Seminar Sammamish River Water Quality Model Status Report November 19, 2002

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