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ARS Home » Pacific West Area » Riverside, California » Agricultural Water Efficiency and Salinity Research Unit » Docs » Model » HYDRUS-1D Tutorial Example 1
HYDRUS-1D Tutorial Example 1
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Infiltration of Water Into a One-Dimensional Soil Profile
Project Manager
  • Button "New"
  • Name: Infiltr1
  • Description: Infiltration of water into soil profile
  • Button "OK"
Main Processes
  • Heading: Infiltration of water into soil profile
  • Button "Next"
Geometry Information
  • Button "Next"
Time Information
  • Final Time: 1
  • Initial Time Step: 0.0001
  • Minimum Time Step: 0.000001
  • Button "Next"
Print Information
  • Number of Print Times: 12
  • Button "Select Print Times"
  • Button "Next"
Water Flow - Iteration Criteria
  • Button "Next"
Water Flow - Soil Hydraulic Model
  • Button "Next"
Water Flow - Soil Hydraulic Parameters
  • Catalog of Soil Hydraulic Properties: Loam
  • Button "Next"
Water Flow - Boundary Conditions
  • Upper Boundary Condition: Constant Pressure Head
  • Lower Boundary Condition:: Free Drainage
  • Button "Next"
Soil Profile - Graphical Editor
  • Menu: Conditions -> Initial Conditions -> Pressure Head or Toolbar: red arrow
  • Button "Edit condition", select withMouse the first node and specify 1cm pressure head
  • Menu: Conditions -> Observation Points
  • Button "Insert", Insert nodes at 20, 40, 60, 80, and 100 cm
  • Menu: File -> Save Data
  • Menu: File -> Exit
Soil Profile - Summary
  • Button "Next"
Execute HYDRUS
OUTPUT:
  • Observation Points
  • Profile Information
  • Water Flow - Boundary Fluxes and Heads
  • Soil Hydraulic Properties
  • Run Time Information
  • Mass Balance Information
Close Project
 

Infiltration of Water and Solute
into a One-Dimensional Soil Profile
Project Manager
  • Click on Infiltr1
  • Button "Copy"
  • New Name: Infiltr2
  • Description: Infiltration of Water and Solute into Soil Profile
  • Button "OK", "Open"
Main Processes
  • Check "Solute Transport"
  • Button "Next"
Solute Transport - General Information
Solute Transport - Transport Parameters
  • Disp. = 1 cm
Solute Transport - Reaction Parameters
Solute Transport - Boundary Conditions
  • Upper Boundary Condition: 1
  • Lower Boundary Condition: Zero Gradient
OUTPUT:
  • Observation Points
  • Profile Information
  • Solute Transport - Boundary Actual and Cumulative Fluxes

Possible Additional Modifications:

1. Longer simulation time
Project Manager
  • Click on Infiltr2
  • Button "Copy"
  • New Name: Infiltr3
  • Button "OK", "Open"
Time Information
  • Final Time: 2.5 d
Print Information
  • Button "Select Print Times"
  • Button "Default"
  • Button "Next"

2. Solute Retardation
Solute Transport - Reaction Parameters
  • Ks = 0.5

3. Two Soil Horizons
Geometry Information
  • Number of Soil Materials: 2
Water Flow - Soil Hydraulic Parameters
  • 1. line - Silt
Solute Transport - Reaction Parameters
  • Ks = 0
Soil Profile - Graphical Editor
  • Button "Edit condition", select withMouse the lower 50 cm and specify Material
  • Menu: File -> Save Data
  • Menu: File -> Exit

4. Different Spatial Discretization
Soil Profile - Graphical Editor
  • Menu: Conditions -> Profile Discretization or Toolbar: ladder
  • Button "Insert Fixed", at 50 cm
  • Button "Density", at 50 cm 0.5, at the soil surface 0.3
  • Menu: Conditions -> Initial Conditions -> Pressure Head or Toolbar: red arrow
  • Button "Edit condition", select withMouse the first node and specify 1cm pressure head
  • Menu: Conditions -> Observation Points
  • Button "Insert", Insert nodes at 20, 40, 60, 80, and 100 cm
  • Menu: File -> Save Data
  • Menu: File -> Exit