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Additional measures are taken to improve solution efficiency in transient problems, including automatic time step adjustment and ensuring that the Courant and Peclet numbers do not exceed preset levels. The water content term is evaluated using the mass-conservative method proposed by Celia et al. (1990).
To minimize numerical oscillations upstream weighing is included as an option for solving the transport equation. In addition, HYDRUS implements a Marquardt-Levenberg type parameter estimation technique for the inverse estimation of selected soil hydraulic and/or solute transport and reaction parameters from measured transient or steady-state flow and/or transport data (only for the standard modules).
Two Examples demonstrating the use of the seepage face to represent subsurface drains. Soil hydraulic properties are described using either Genuchten or Brooks&Corey functions. Download HYDRUS projects now (1.2 MB) Stony Soils Examples from Hlavacikova at al. (2016), demonstrating the use of HYDRUS to estimate the hydraulic conductivity of stony soils for different shapes of rock fragments.
ad brief description now
HYDRUS is a Windows application for simulating water, heat, and solute movement in one-, two- and three-dimensional variably saturated media. The program can be extended with a number of special add-on modules.
HYDRUS is currently being used by more than 3000 companies and institutions from around the world - see the list of selected customers. This list also includes almost 50% of the World's top 100 universities 2014.
Parameter estimation from a cone penetrometer experiment (Gribb et al., 1998) Parameter estimation from a tension disc infiltrometer experiment (Simunek et al., 1998a) Parameter estimation from a tension disc infiltrometer experiment (Simunek et al., 1998b)
Examples demonstrating the use of the UNSATCHEM module simulating transport of major ions and their mutual interactions.
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