Add-on Modules

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HYDRUS Add-on Modules

Add-on modules can be purchased for an existing HYDRUS license either individually or as part of a cost-effective package - see HYDRUS pricing.

Available Add-on Modules

Module Name	Dimension	Flow, Transport, and Reaction Simulations
HP1, HP2	1D, 2D	The HP1 and HP2 modules are the result of coupling Hydrus (its one- and two-dimensional parts) with the PHREEQC geochemical code [Parkhurst and Appelo, 1999], and corresponds to a similar one-dimensional module HP1 [Jacques and Šimůnek, 2005, 2010; Jacques et al., 2006, 2008]. HP2 has, apart from the dimensionality (2D), the same capabilities as HP1. HP2 contains modules simulating (1) transient water flow, (2) the transport of multiple components, (3) mixed equilibrium/kinetic biogeochemical reactions, and (4) heat transport in two-dimensional variably-saturated porous media (soils). Detailed description of the HP2 Module is given in the HP2 user manual [Šimůnek et al., 2012].
UnsatChem	1D, 2D, 3D	The Major Ion Chemistry Module [UNSATCHEM; Šimůnek and Suarez, 1994] can be used instead of the standard solute transport module. Detailed description of the UNSATCHEM Module is given in the UNSATCHEM user manuals [Šimůnek et al., 2012, 2022]. More detailed description of concepts used in the UNSATCHEM module is provided in the HYDRUS-1D technical manual Šimůnek et al., 2022], which provides all relevant information about the one-dimensional version of this module.
Wetland	2D	The Wetland Module (for two-dimensional problems only) was developed to model biochemical transformation and degradation processes in subsurface flow constructed wetlands. In the wetland module two biokinetic model formulations can be chosen: (1) the biokinetic model as described in CW2D [Langergraber and Šimůnek, 2005, 2006, 2011] and (2) the CWM1 (Constructed Wetland Model #1) biokinetic model Langergraber et al., 2009]. In CW2D aerobic and anoxic transformation and degradation processes for organic matter, nitrogen and phosphorus are described, whereas in CWM1 aerobic, anoxic and anaerobic processes for organic matter, nitrogen and sulphur.
C-Ride	1D, 2D	The C-Ride module simulates one- and two-dimensional variably-saturated water flow, colloid transport, and colloid-facilitated solute transport in porous media. The module accounts for transient variably-saturated water flow, and for both colloid and solute movement due to advection, diffusion, and dispersion, as well as for solute movement facilitated by colloid transport. Detailed description of the C-Ride Module is given in the C-Ride user manuals [Šimůnek et al., 2012, 2022].
DualPerm	1D, 2D	The DualPerm module for simulating two-dimensional variably-saturated water movement and solute transport in dual-permeability porous media, i.e., preferential and nonequilibrium water flow and solute transport [Gerke and van Genuchten, 1993; Šimůnek et al., 2003; Šimůnek and van Genuchten, 2008].
Furrow	2D	The Furrow module is a hybrid Finite Volume – Finite Element (FV-FE) model that describes the coupled surface-subsurface flow and transport processes occurring during furrow irrigation and fertigation Brunetti et al., 2018]. The numerical approach combines a one-dimensional description of water flow and solute transport in an open channel with a two-dimensional description of water flow and solute transport in a subsurface soil domain.
PFAS	1D, 2D, 3D	The PFAS module includes options to consider sorption to the air-water interface and the concentration effects on surface tension and viscosity Silva et al., 2020].
Particle Tracking	1D	The Particle Tracking algorithm from Šimůnek [1991] was implemented into HYDRUS Zhou et al., 2021]. The results of this module can be used to calculate soil water travel times and water age for different locations in the soil profile.
COSMIC	1D	The COSMIC module developed by Brunetti et al. [2019] calculates above ground neutron fluxes used the physically-based COsmic-ray Soil Moisture Interaction Code (COSMIC) of Shuttleworth et al. [2013].
DPU	1D, 2D	The Dynamic Plant Uptake (DPU) module developed by Brunetti et al. 2019, 2021, 2022] simulates the translocation and transformation of neutral compounds in the soil-plant domain.
Fumigant	1D, 2D, 3D	The Fumigant module includes options required to simulate the fate and transport of fumigants in soils (e.g., removal of a tarp, temperature-dependent tarp properties, an additional injection of fumigant) Spurlock et al., 2013].

Module Name	Dimension	Parameter Optimization
GOpt	1D	The GOpt module includes three global optimization algorithms (i.e., Particle swarm optimization (PSO) [Kennedy and Eberhart, 1995; Shi and Eberhart, 1998], Comprehensive learning particle swarm optimization (CLPSO) [Liang et al., 2006], and Gradient-Based comprehensive learning particle swarm optimization (G-CLPSO) [Brunetti et al., 2022c]).

Module Name	Dimension	Program Performance
HyPar	2D, 3D	HyPar is a parallelized version of the standard two-dimensional and three-dimensional HYDRUS computational modules (h2d_calc.exe and h3d_calc.exe). HyPar uses parallel programming tools and techniques to take advantage of multiple cores and to accelerate calculations on multi-core processor computers. HyPar currently supports only calculations in the direct mode (does not support the inverse mode), and it does not support any add-on modules (e.g., HP2, UnsatChem, Wetland, DPU, and/or C-Ride). It supports processes and factors available in HYDRUS Version 5.01 (the processes and factors implemented in later versions will be made available in HyPar in the near future). The HyPar module is initialized on the Program Tab of the Program Options dialog window.

Module Name	Dimension	Slope Stress and Stability
Slope Cube	2D, 3D	The add-on module "Slope Cube" (Slope Stress and Stability) was developed to provide a unified effective stress approach for both saturated and unsaturated conditions [Lu et al., 2010]. The module is intended to predict spatially and temporally infiltration-induced landslide initiation and to carry out slope stability analyses under variably-saturated soil conditions. Transient moisture and pressure head fields are directly obtained from the HYDRUS model, and subsequently used to compute the effective stress field of hillslopes [Lu and Godt, 2013]. Furthermore, instead of the methodology of one-slope for one factor safety in the classical slope stability analysis, the SLOPE Cube module computes fields of the factor of safety in the entire domain within hillslopes [Lu et al., 2012], thus allowing identification of the development of potential failure surface zones or surfaces.
Slope Classic	2D	The "Slope Classic" add-on module is intended to be used mainly for stability checks of embankments, dams, earth cuts and anchored sheeting structures. The influence of water is modeled using the distribution of pore pressure, which is imported automatically from the HYDRUS results for specified times. Each time step of water distribution can be analyzed separately.

Above-mentioned references are given on webpages of particular modules.