PC-Progress s.r.o.

HYDRUS Services

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HYDRUS (2D/3D) is a software package for simulating water, heat, and solute movement in two-and three-dimensional variably saturated media. HYDRUS, and its former version Hydrus-2D, currently have hundreds of users around the world, and are distributed by PC-Progress, Czech Republic, the International Ground Water Modeling Center (IGWMC), Golden, Colorado, and Soil Water, Japan. Numerical modeling of highly nonlinear systems, such as variably saturated water flow in porous media, is a very complex problem and users without sufficient experience and training do not always obtain correct results. Therefore, in addition to free services and sources, we have decided to provide to users of HYDRUS extended services by supporting the use of the standard version of HYDRUS, as well as implementing user-requested modifications of HYDRUS. Similar services are offered also for the Hydrus-1D software package, the one-dimensional version.

Modification of graphical user interface (GUI) or computational module based on clients' specification.

This service includes:

  • Service A above
  • Modification of a computational module and/or GUI for problems that cannot be solved using the standard version of HYDRUS. Providing modified version to client or using it for service A (above)

Possible modifications:

  • Additional models for describing soil hydraulic properties
  • Soil hydraulic properties in tabular form
  • Additional sorption (e.g., Gunary, Tempkin, exponential, double Langmuir) and/or decay (e.g., Monod, Michaelis-Menton, logarithmic, logistic) models
  • Problem specific boundary conditions
  • Additional dynamic boundary conditions
  • Sharp material interfaces (e.g., for capillary barriers)
  • Wells (e.g., draw down and/or filling)
  • Colloid, virus, and/or bacteria transport: air-water interface, additional blocking functions, size exclusion
  • Density dependent water flow
  • Coupled heat, flow and vapor transport
  • Energy balance at the soil surface
  • Other than sequential interactions between individual solute species
  • Coupling with additional hydrobiogeochemical modules (e.g., PHREEQC, similarly to HP1)
  • Variable gravity term (e.g., centrifuge or extraterrestrial conditions)
  • Different definitions of the objective function for inverse modeling
  • Dual-permeability water flow and solute transport (e.g., Gerke and van Genuchten, 1993)
  • Falling water level dependent on infiltration, precipitation, and evaporation (e.g., furrows and ponds)
  • Many others

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