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Session 4A

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Home / Programs / Hydrus-2D / Tutorials / Session 4A

Session 4A - Water Flow to a Stream 1

  • Project Manager Button “New”
    Name: plume1
    Description: Water flow to a stream - 1
    Button “Open”
  • Main Processes Heading: Water flow to a stream - 1
    Button “Next”
  • Geometry Information Type of Flow: Vertical Plane
    Geometry Type: General
    Number of materials: 1
    Length Units: cm
    Button “Next”
  • Time Information Time Units: Days
    Final time: 100
    Initial Time Step: 0.001
    Minimum Time Step: 0.00001
    Maximum Time Step: 5
    Button “Next”
  • Print Information Check All Number of Print Times: 6
    Button "Select Print Times": 1 5 10 25 50 100
    Button “Next”
  • Water Flow - Iteration Criteria Water content tolerance: 0.0005
    Pressure head tolerance: 1
    Lower Limit of the Tension Interval: 0.001
    Upper Limit of the Tension Interval: 1000
    Button “Next”
  • Water Flow - Soil Hydraulic Model Button “Next”
  • Water Flow - Soil Hydraulic Parameters Catalog: Loam
    Button “Next”
  • Meshgen-2D: Geometry
    Window Coordinates: X=2500, Y=250, Width= 6000, Hight=600
    Set view Stretching factors according to given extents
    Menu: Tools->Grid Setting: Width = 100, Hight = 20
    Enlarge Window to entire screen
    Menu: Insert->Line->Graphically
    Menu: Insert->Spline->Graphically
    Menu: View->Stretching->In Y Direction: 0.2
    Save
     

Notice that units in this figure are in meters, and thus have to be converted to cm
  • Meshgen-2D: Boundary Points
    Toolbar Button: “Edit Boundary Points”
    Button “Number of Boundary Points”: 500
    Nodal Density:
     

Save
  • Meshgen-2D: FEM Mesh
    Toolbar Button: “Edit FEM Mesh”
    Button: Make mesh
    Save
    Exit
  • The BOUNDARY Module:
    • Initial Condition:
      Toolbar Button: “Initial Condition”
      Button "Select": Select the entire transport domain between x=0cm and 400 cm Button "Set Value": check "equilibrium from the lowest located nodal point." And set equal to 350.
      Ditto for x=(400,1000), h=300
      Ditto for x=(1000,1600), h=250
      Ditto for x=(1600,3300), h=200
      Ditto for x=(3300,5000), h=175
    • Water Flow Boundary Conditions: Toolbar Button: “Water Flow BC”
      • Select "Constant pressure", select left side boundary, specify 400 cm with equilibrium from the lowest located nodal point.
      • Ditto for the right side boundary with h=190 cm with equilibrium from the lowest located nodal point. Zoom on the stream
      • Ditto for stream: nodes with z coordinate smaler than 175 cm, h=80 cm with equilibrium from the lowest located nodal point. Zoom on the slope left of the stream
      • Select "Seepage face": nodes left of stream with z coordinate smaller then 300 cm.
    • Toolbar Button: “Default View”
      Save
      Close
  • Execute HYDRUS
    (Execution time on P5-300 = 534)
  • OUTPUT:
    Menu: Post-Processing -> Graphical Display of Results
    Pressure heads
    Water contents
    Velocities
 

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