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Šimůnek, J., M. Th. Genuchten, and M. Šejna, Development and applications of the HYDRUS and STANMOD software packages, and related codes, Vadose Zone Journal, doi:10.2136/VZJ2007.0077, Special Issue “Vadose Zone Modeling”, 7(2), 587-600, 2008. (Highly cited paper according to Web of Knowledge (ISI))
AAAS (American Association for Advancement of Science, SSSA (Soil Science Society of America) and ASA (American Society of Agronomy), which are the highest awards given by these respective societies. Both these scientists are one of the most widely cited researchers in their field of science, having an h-index of 66 and 56 (in 2019), respectively, and tens of thousands of citations (both according to Web of Knowledge). Always at the cutting edge of the most recent developments in vadose zone hydrology.
The User Manual is also free to download, and provides descriptions of the main components of the graphical user interface, as well as many software related details (such as the main dialog windows, commands, and menus).
The governing equations are solved numerically using a Galerkin type linear finite element method applied to a network of triangular elements. Integration in time is achieved using an implicit (backwards) finite difference scheme for both saturated and unsaturated conditions.
The resulting equations are solved in an iterative fashion, by linearization and subsequent Gaussian elimination for banded matrices, a conjugate gradient method for symmetric matrices, or the ORTHOMIN method for asymmetric matrices.
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