Hydrus (software)
hydrologic simulation software suite
Hydrus is a suite of Windows-based modeling software that can be used for analysis of water flow, heat and solute transport in variably saturated porous media (e.g., soils). HYDRUS suite of software is supported by an interactive graphics-based interface for data-preprocessing, discretization of the soil profile, and graphic presentation of the results. While HYDRUS-1D simulates water flow, solute and heat transport in one-dimension, and is a public domain software, HYDRUS 2D/3D extends the simulation capabilities to the second and third dimensions, and is distributed commercially.
History
HYDRUS 1D
HYDRUS-1D traces its roots to the early work of van Genuchten and his SUMATRA and WORM models, as well as later work by Vogel (1987) and Kool and van Genuchten (1989) and their SWMI and HYDRUS models, respectively. While Hermitian cubic finite element numerical schemes were used in SUMATRA and linear finite elements in WORM and the older HYDRUS code for solution of both the water flow and solute transport equations, SWMI used finite differences to solve the flow equation.
Various features of these four early models were combined first in the MS-DOS-based SWMI_ST model (Šimůnek et al., 1993), and later in the Windows-based HYDRUS-1D simulator (Šimůnek et al., 1998). After releasing versions 1 (for 16-bit Windows 3.1) and 2 (for 32-bit Windows 95), the next two major updates (versions 3 and 4) were released in 2005 and 2008. These last two versions included additional modules applicable to more complex biogeochemical reactions than the standard HYDRUS modules.
While the standard modules of HYDRUS-1D can simulate the transport of solutes that are either fully independent or involved in the sequential first-order degradation chains, the two new modules can consider mutual interactions between multiple solutes, such as cation exchange and precipitation/dissolution.
Version 3 included the UNSATCHEM module (Suarez and Šimůnek, 1997) for simulating carbon dioxide transport as well as the multi-component transport of major ions.
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