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Using WPHAST to Model the Central Oklahoma Aquifer—Flow

Using WPHAST to Model the Central Oklahoma Aquifer—Flow. David Parkhurst, Ken Kipp, and Scott Charlton. Arsenic in the Central Oklahoma Aquifer. Arsenic mostly in confined part of aquifer Arsenic associated with high pH Flow: Unconfined Confined Unconfined. The Wizard.

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Using WPHAST to Model the Central Oklahoma Aquifer—Flow

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  1. Using WPHAST to Model the Central Oklahoma Aquifer—Flow David Parkhurst, Ken Kipp, and Scott Charlton

  2. Arsenic in the Central Oklahoma Aquifer • Arsenic mostly in confined part of aquifer • Arsenic associated with high pH • Flow: • Unconfined • Confined • Unconfined

  3. The Wizard • Procures the minimum amount of information for a simulation • All data can be changed subsequently • EXCEPT location of coordinate origin on map and angle, when using a map bitmap • Heterogeneity can be defined subsequently

  4. Select Model Options

  5. years Select Units / year

  6. Importing a Bitmap • Import map c:\student\ok_wphast\ok.bmp • World file (ARC/INFO generated) ok.bpw

  7. X 90000, 16 nodes Y 48000, 9 nodes Z 400, 5 nodes Move grid as shown river at north and south boundaries (east side) east boundary at contact Define Grid Mouse Controls • Inside grid affects grid • Outside grid affects all • Middle mouse—pan • Right mouse—zoom in/out • Cntl left mouse—2D rotate

  8. Define Default Media Properties

  9. Define Initial Head 380

  10. Leave Default for Chemistry Initial Conditions Chemistry ignored for Flow Only

  11. Define Time Step and Simulation Period Steady-flow calculation has automatic time stepping Default minimum = time step/1000; maximum = time step*1000

  12. WPHAST Main Screen Save in c:\student\okflow Save often File|Save As… Tree • Current definitions • Expand/hide branches • Check to toggle visibility • Click to select • Double click to modify

  13. WPHAST Main Screen • View|View From Direction • Cntl-d, page up/down • Home • Edit|Undo • Cntl-z • Edit|Redo • Cntl-y Mouse Controls • Left mouse—3D rotate • Middle mouse—pan • Right mouse—zoom in/out • Cntl left mouse—2D rotate Tools|Geometry Scale the Z-axis (40x)

  14. Boundary Conditions • Defined by “cell” or “node” • We will define 6 boundary conditions • 1 Flux b.c. for recharge • 2 Rivers • 2 Leaky b.c. • 1 Specified head b.c. • Last definition for a cell takes precedence

  15. Flux Boundary Condition Create new zone • 2D view Home key • Recharge (flux) on Eastern 2/3 of area encloses X=36000 to 90000 • Depth and location of zone can be adjusted later

  16. Flux Boundary Condition Choose Flux_BC

  17. Flux Boundary Condition Modify zone • Z definition encloses a single plane of nodes at 400 m

  18. Define the Little River • View • View|Hide all • View|Set projection to|Parallel • Tools|New river or icon • Draw river ~(0,46000) to ~(0,90000) • Type “enter” after last point

  19. River PropertiesInterpolated between river points

  20. Define the North Fork River

  21. Three Boundary Conditions Done, Three To Go

  22. Define Two Leaky Boundary Conditions

  23. Leaky Boundaries • North • X to edge of confining unit 0-35000 • Y 48000-48000 • Z 0-400 • South • X to edge of confining unit 0-42000 • Y 0-0 • Z 0-400

  24. Specified Head: Lake Stanley Draper • Zone must enclose a node • Head 348 • Z 300-400 Click Apply

  25. Completed Definition of Flow Problem

  26. Run Run dialogue Run simulation Save

  27. Model Viewer • 3D Viewer • Views heads, velocities, and user-specified chemical data • Slices and dices • Animations • Same mouse control as WPhast • Reads HDF file made by PHAST (.h5)

  28. Model Viewer • File|New • 3 screens to get started

  29. View Head Distribution with Model Viewer • Show|Solid • Show|Color Bar • Tools|Geometry • Set Z to 40 (40x vertical exaggeration)

  30. Mouse Controls • Left mouse— 3D rotate • Middle mouse—pan • Right mouse—zoom in/out • Cntl left mouse—2D rotate

  31. Model Viewer—“Show” menu Select items to be present in the visualization • Visualization • Solid/ • Isosurface • None • Vectors • Model features • Grid lines • Time • Color bar

  32. Model Viewer—“Tools” menu Provides menus that change the look of the features selected by Show. • Data • Color bar • Geometry • Model features • Crop • Animation

  33. Tools in Model Viewer

  34. Summary • PHAST as a flow model • WPhast and GoPhast are 3D interfaces to PHAST • 3D viewing by Model Viewer Optional exercises follow Next—Transport and Reaction

  35. Optional Exercises • Add a well • Refine grid • Add another river

  36. Adding a Well: Tools|New well

  37. Adding a Well • XY location • Diameter/Radius • Flow allocation • Open intervals • Pumping/Injection schedule • Positive is injection • Negative is pumping

  38. Tools|Modify Grid

  39. Double Number of Elements in X, Y, and Z Directions

  40. Refined Grid

  41. Define the North Canadian River

  42. Heads with Refined Grid

  43. Isosurface View

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