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MODFLOW Conceptual Models

CE EN 547 – BRIGHAM YOUNG UNIVERSITY. MODFLOW Conceptual Models. Steps. Build conceptual model object Build coverages Define grid frame Build grid Initialize MODFLOW Activate cells in coverage Map  MODFLOW. 1. Build Conceptual Model Object. Used to organize conceptual model data

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MODFLOW Conceptual Models

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  1. CE EN 547 – BRIGHAM YOUNG UNIVERSITY MODFLOW Conceptual Models

  2. Steps • Build conceptual model object • Build coverages • Define grid frame • Build grid • Initialize MODFLOW • Activate cells in coverage • Map  MODFLOW

  3. 1. Build Conceptual Model Object • Used to organize conceptual model data • Defines flow package, transport option, species, etc.

  4. 2. Build MODFLOW Coverages • Any combination of coverages can be used • Select desired properties

  5. Conductances • Many of the objects in the Source/Sink category must be assigned a conductance value. • For arcs • the conductance should be assigned on a conductance per length basis. • For polygons • the conductance should be assigned on a conductance per area basis. GMS computes length or area and computes and assigns the appropriate value.

  6. Arc Conductance

  7. Polygon Conductance

  8. Well Screens • Elevations entered for well screen as part of well properties • Layers and partitioned Q automatically assigned

  9. Auto Assign Elevations • Elevations entered at nodes as part of properties • Layers automatically assigned

  10. 3. Grid Frame • Defines location of grid relative to conceptual model • Can be used to rotate the grid • Use Grid Frame tool to edit

  11. 4. Build Grid • Select “Map  3D Grid” command from Feature Object menu • Creates grid that fills grid frame

  12. 5. Initialize MODFLOW • Select “New Simulation” command in MODFLOW Menu in 3D Grid Module • Initializes MODFLOW data structures • Defines steady state vs. transient • Defines stress periods (if applicable)

  13. 6. Activate Cells in Coverage • Select the “Activate Cells in Coverage(s)” command in Feature Objects menu • Inactivates all cells outside of conceptual model boundary

  14. 7. Map  MODFLOW • Select conceptual model in Project Explorer • Select the “Map  MODFLOW” command in Feature Objects menu • Discretizes model input

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