Session 2A

Session 2A - Infiltration From a Subsurface Source (Water Flow)

Project Manager

  Button ”New”
  Name: source1
  Description: Infiltration from a Subsurface Source
  Button ”Open”

Main Processes

  Heading: Infiltration from a Subsurface Source
  Button ”Next”

Geometry Information

  Type of Flow: Vertical Plane
  Geometry Type: General
  Length Units: m
  Number of materials: 1
  Button ”Next”

Time Information

  Time Units: Days
ng: Width = 0.5, Hight = 0.5
Menu: Insert->Line->Graphically: (0,0), (2,0), (2,5), (0,5), (0,0)
Save

Meshgen-2D: Boundary Points

Toolbar Button: ”Edit Boundary Points”
Button ”Number of Boundary Points” 120
Button ”Insert Fix Point” at (0,3.5)
Button "Density"
  (0,0): 3, 5 Unselect ”Use left value for both”
  (2,0): 5, 5
  (2,5): 3, 3
  (0,5): 3, 2 Unselect ”Use left value for both”
  (0,3.5): 0.2, 0.2
Save

Meshgen-2D: FEM Mesh
Toolbar Button: ”Edit FEM Mesh”
Button: Make mesh
Save
Exit

The BOUNDARY Module:

1. Initial Condition:
   Toolbar Button: ”Initial Condition”
   Button ”Select”: Select the entire transport domain
   Button ”Set Value”: -1
2. Water Flow Boundary Conditions:
   Toolbar Button: ”Water Flow BC”
   Zoom on source: (0,3.5)
   1. Select ”Constant pressure”, select three point below and three above the point (0,3.5), specify 0 cm
      Toolbar Button: ”Default View”
   2. Select ”Free Drainage”, select points at the bottom of the soil profile
3. Observation points
   Toolbar Button: ”Observation Points”
   S pecify 5 points arbitrarily below the source
   Save
   Exit

Execute HYDRUS
(Execution time on P5-300 = 199s)

OUTPUT:
Menu: Post-Processing ->Observation Points
Menu: Post-Processing ->Boundary Information->Boundary Fluxes:

  Constant Boundary
  Free Drainage

Menu: Post-Processing ->Graphical Display of Results

  Pressure heads
  Water contents