Modeling the Spokane River System Scott A. Wells Dept. of Civil and Environmental Engineering Portland State University
Spokane River System Model Spokane Lake or Long Lake N W A S H IN G T O N ID A H O Long Lake Washington section Idaho section Little Spokane R . S p o k a n e R ive r K a ise r S p o ka n e IW T P A W T P D e e p C re e k L ib e re ty L a ke P O T W In la n d E m p ire P a p e r C o . S p o k a n e C o e u r D 'A le n e L a k e H a n g m a n C re e k 8 4 0 8 1 6 Miles
Spokane River Model Grid Long Lake Total of 189 segments from Long Lake to state line 62 segments in Idaho
Periphyton
Spokane River – Long Lake Plunging inflow Cyanobacteria blooms Long Lake
Spokane Temperature Model Prediction Long Lake River Julian Day Julian Day 205.700 205.700 475 Plunging 7/24/2001 7/24/2001 inflow 470 T 22.0 465 21.3 20.5 19.8 460 19.1 18.3 17.6 455 16.8 Elevation, m 16.1 450 15.4 14.6 13.9 445 13.2 12.4 11.7 440 10.9 10.2 435 9.5 8.7 8.0 430 425 420 415 10000 20000 30000 Distance, m
Spokane River Arm of Lake Roosevelt Spokane River 8/21/2006 8.41 7.9 8.1 8.14 8.71 8.31 7.92 7.41 8.14 8.13 50 7.96 7.94 7.02 7.73 7.1 DO, mg/L 7.77 6.86 6.71 7.19 7 45 6.81 10.6 7.43 6.87 6.51 7.01 10.4 40 10.2 7.36 6.87 5.68 6.74 6.62 10 7.49 6.84 5.31 9.8 35 9.6 7.53 6.79 5.15 9.4 Relative Elevation, m 9.2 7.35 6.47 5.03 30 9 7.24 5.97 3.66 8.8 3.02 8.6 25 7.38 4.61 8.4 7.39 3.23 8.2 20 8 7.8 7.6 15 7.11 2.07 6.5 4.5 1.67 2.5 10 0.5 Spokane arm of Lake Roosevelt 5 6.33 6.03 0 5 10 15 20 25 30 35 River km Long Lake Dissolved oxygen along Spokane arm
Bathymetry and Grid for Lake Roosevelt Model segments Side view of grid Model Grid (1 m vertical) (~ 500, 1000 m, longitudinal) 533 active Spokane arm of Lake Roosevelt segments
Timeline of Upper Spokane River Model Year Milestone CE-QUAL-W2 Model 2002 Completed Development and Calibration of Version 3.1 Washington Upper Spokane River Model for Years 1991 (Feb 1-Oct 31) and 2000 (Jan 1-Oct 31) 2003 Completed Development and Calibration of Version 3.1 Washington Upper Spokane River Model for Year 2001 (low-flow critical year between April 30-September 30) 2005 Completed Development and Calibration of Version 3.1 Idaho Upper Spokane River Model for Years 2001 and 2004 2009 Converted Washington and Idaho Upper Version 3.6 Spokane River Models to Version 3.6 (Variable Stoichiometry) 2010 Completed Final Scenarios Report for EPA Version 3.6
River Section Reservoir Section Slope=S=tan x g z u w u x w z CE-QUAL-W2 Q out • A 2-D (vertical-longitudinal), unsteady finite difference model for hydrodynamics and water quality for rivers, reservoirs, lakes, estuaries
CE-QUAL-W2 State Variables • labile and refractory particulate • Temperature, velocity (U, W), organic matter fractions Water surface elevation • # different algal groups • TDS • # different periphyton groups • # Arbitrary Constituents (such as • zooplankton bacteria, tracer, water age, • NH 4 -N toxics) • PO 4 -P • # Inorganic suspended solids • NO 3 -N+NO 2 -N groups • Iron • # CBOD groups • labile and refractory dissolved • Alkalinity organic matter groups • pH and carbonate system (HCO 3 , • Dissolved and particulate silica CO 3 , H 2 CO 3 ) • Total inorganic carbon • Sediment Model
Calibration • Flow rate at gaging station sites 12/31/99 2/29/00 4/29/00 6/28/00 8/27/00 10/26/00 900 Segment 97, Br 9, JR 4 Spokane River at Spokane RM 72.8 800 Data Model 700 600 Flow, m3/s 500 400 300 200 100 0 0 30 60 90 120 150 180 210 240 270 300 330 Julian Day
12/31/99 2/29/00 4/29/00 6/28/00 8/27/00 10/26/00 608 Segment 24, Br 2, JR1 RM 90.34 607 Calibration Water Level (m - NGVD) 606 605 604 • Water level at gaging 603 station sites 602 Model Data 601 Spokane River at Barker Road Bridge 600 0 30 60 90 120 150 180 210 240 270 300 330 12/31/90 3/21/91 6/9/91 8/28/91 11/16/91 Julian Day 469 Segment 188 468 Water Level (m - NGVD) 467 466 465 Data 464 Model 463 Spokane River at Long Lake Dam 462 0 40 80 120 160 200 240 280 320 360 Julian Day
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