Basic Options

Title: A description of the simulation. Must be 80 characters or less.

Length, Time, and Energy Units: The most commonly used units are SI units (meters, seconds, and joules). The user may specify different units. The same units apply to all data. For example, if units are meter (m) and second (s), then hydraulic conductivity will be in m/s. Temperature is always in degrees Celsius.

Note:The program does not convert values if units are changed after data entry. Data always maintain their numerical values as entered by the user.

Use radial coordinates: Select this option to simulate flow (and transport) in a cylindrical domain with axial symmetry.

Simulate transport: Select this option to include energy transport in the simulation.

Simulate Evaporation: Select this option to include evaporation (over bare soil) in the simulation.

Simulate Transpiration: Select this option to include transpiration (plant-root extraction) in the simulation.

NOTE -- The user is cautioned on the use of evaporation and evapotranspiration in VS2DH. These processes can influence and be influenced by soil temperature. As described in Lappala and others (1987) and implemented in VS2DH, these processes are assumed to be isothermal. Users should evaluate the ramifications of this assumption in their applications. If these processes are an integral component of an application, then use of another numerical model that treats evaporation and evaotranspiration in a more realistic fashion may be warranted.

See also:

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