Table 2.

Selected options implemented into HYDRUS (2D/3D) since 2008.

VersionNew options
  • Import of domain properties, initial, and boundary conditions from another project with a (slightly) different geometry or fine element mesh (both 2D and 3D)

  • Tortuosity model by Moldrup et al. (1997, 2000) as an alternative to the Millington and Quirk (1961) model

2.01Computational module:
  • Option to specify initial conditions in the total solute mass (previously only liquid phase concentrations could be specified); program then redistributes the solute mass into separate phases based on distribution coefficients

  • Option to specify the nonequilibrium phase concentrations to be initially at equilibrium with the equilibrium phase concentrations

  • Gradient boundary conditions

  • Subsurface drip boundary conditions (with a drip characteristic function reducing irrigation flux based on the back pressure) (Lazarovitch et al., 2005)

  • Surface drip boundary conditions with a dynamic wetting radius (Gärdenäs et al., 2005)

  • Seepage face boundary conditions with a specified pressure head

  • Triggered irrigation, that is, irrigation can be triggered at a specified boundary when the pressure head at a particular observation node drops below a certain value (Dabach et al., 2013)

  • Time-variable internal pressure head or flux nodal sinks and sources (previously only constant internal sinks and sources were available)

  • Fluxes across mesh lines in the computational module for multiple solutes (previously only for a single solute)

  • HYDRUS calculates and reports surface runoff, evaporation, and infiltration fluxes for atmospheric boundary conditions

  • Water content dependence of solute reaction parameters using the Walker (1974) equation

  • Uncompensated and compensated root water and solute (passive and active) uptake (Šimůnek and Hopmans, 2009)

  • Option to consider a set of boundary condition records multiple times

  • Options related to the Fumigant transport module (e.g., removal of tarp, temperature dependent tarp properties, additional injection of a fumigant)

  • The UnsatChem module simulating transport of, and reactions between, major ions (Šimůnek and Suarez, 1994)

  • The new CWM1 constructed wetland module (Langergraber and Šimůnek, 2012)

Graphical user interface:
  • Support for complex general three-dimensional geometries (Professional Level)

  • Domain properties and initial and boundary conditions can be specified on Geometric Objects (defining the transport domain) rather than on the finite element mesh

  • Import of various quantities (e.g., domain properties and initial and boundary conditions) from another HYDRUS project even with a (slightly) different geometry or fine element mesh

  • Geometric objects can be imported using a variety of file formats (.TXT, .DXF, .SHP, …)

  • Display of results using isosurfaces

  • Support of ParSWMS (the parallelized version of SWMS_3D) (Hardelauf et al., 2007)

  • The DualPerm module simulating flow and transport in dual-permeability porous media (Gerke and van Genuchten, 1993)

  • The C-Ride module simulating particle transport and particle-facilitated solute transport (Šimůnek et al., 2006)

  • The HP2 module (coupled HYDRUS and PHREEQC) for simulating biogeochemical reactions

  • Option to use field capacity as an initial condition (Twarakavi et al., 2009)

  • Authorization of HYDRUS using a hardware key (HASP) in addition to a software key

  • Import of various quantities (such as the pressure head initial condition) from values defined at scattered points in the domain

  • Triggered irrigation (Dabach et al., 2013) was implemented into the UnsatChem module

  • The HYPAR module: a parallelized version of the standard two- and three-dimensional HYDRUS computational modules

  • The SLOPE module to analyze the stability of generally layered two-dimensional soil slopes, using HYDRUS-calculated water contents and pressure heads

  • The SLOPE CUBE (slope, stress, and stability) module for analysis of infiltration-induced landslide initiation and slope stability under variably saturated soil conditions (Lu et al., 2010, 2012)