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The HYDRUS-2D software package for simulating two-dimensional movement of water, heat, and multiple solutes in variably saturated media.
Ponded infiltration is initiated with a 1-cm constant pressure head at the soil surface, while free drainage is used at the bottom of the soil profile.
The heat transport equation considers conduction as well as advection with flowing water. Second Annual Report, Project No. The second example considers the inverse solution of a one-step outflow experiment. Views Read Edit View history. Integrated hydrologic modelling Soil physics Public-domain software.
HYDRUS-1D Tutorials : USDA ARS
Unsaturated water and solute transport model with equilibrium and kinetic chemistry. Data presented by Kool et al. Pages using deprecated image syntax Pages using Infobox software with unknown parameters. The solute transport equations assume advective-dispersive transport in the liquid phase, and diffusion in the gaseous phase.
The HYDRUS packages use a Microsoft Windows based graphical user interface GUI to manage the input data required to run the program, as well as for nodal discretization and editing, parameter allocation, problem execution, and visualization of results. The program offers graphs of the distributions of the pressure head, water content, water and solute fluxes, root water uptake, temperature and solute concentrations in the subsurface at pre-selected times.
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.
Constructed wetlands CWs are engineered water treatment systems that optimize the treatment processes found in natural environments. From Wikipedia, the free encyclopedia.
The one-dimensional profile is discretized using nodes. HYDRUS software also provides capabilities for simulating water flow and solute transport for specialized domains. The solute transport equations considered advective-dispersive transport in the liquid phase, as well as diffusion in yhdrus gaseous phase. Federal government websites always use a.
The unsaturated soil hydraulic properties can be described using van Genuchten, Brooks and Corey, modified van Genuchten, Kosugi, and Durner type analytical functions. The flow equation for the latter purpose can consider dual-porosity-type flow with a fraction of the water content being mobile, and a fraction immobile. The codes incorporates hysteresis by assuming that drying scanning curves are scaled from the main drying curve, and wetting scanning curves from the main wetting curve.
A unique feature of HYDRUS-2D was that it used a Microsoft Windows based Graphics User Interface GUI to manage the input data required to run the program, as well as for nodal discretization and editing, parameter allocation, problem execution, and visualization of results.
Infiltration into a one-dimensional soil profile Water flow Solute transport Possible additional modifications Inverse Problem: CWs are popular systems which efficiently treat various types of polluted water and are therefore sustainable, environmentally friendly solutions.
It could handle flow regions delineated by irregular boundaries, as well as three-dimensional regions exhibiting radial symmetry about the vertical axis.
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.
Infiltration is run for one day. All spatially distributed parameters, such as those for various soil horizons, the root water uptake distribution, and the initial conditions for water, heat and solute movement, are specified in a graphical environment. This page was last edited on 23 Augustat These include 1 a longer simulation time, 2 considering solute retardation, 3 using a two-layered soil profile, and 4 implementing alternative spatial discretization.
The model additionally considered root water uptake as well as a range of pertinent boundary conditions required to ensure wide applicability of the model. A first, only water flow is considered, after which B solute transport is added. The code includes the MeshGen2D mesh generator, which was specifically designed for variably-saturated subsurface flow and transport problems.
UNSAT was a finite element model simulating water flow in two-dimensional variably-saturated domains as described with the Richards equation.
Finite element computer programs for flow in saturated-unsaturated porous media. The transport equations also included provisions for nonlinear nonequilibrium reactions between the solid and liquid phases, linear equilibrium reactions between the liquid and gaseous phase, zero-order production yydrus two first-order degradation reactions: Research Report No Several other modifications are suggested in part C.
The flow equation also includes a sink term to account for water uptake by plant roots as a function of both water and salinity stress. Both software packages are also used in classrooms of many universities in courses covering Soil Physics, Processes manhal the Vadose Zone, or Vadose Zone Hydrology.
Also included is a small catalog of unsaturated soil hydraulic properties, as well as pedotransfer functions based on neural networks.
Both programs use linear finite elements to numerically solve the Richards equation for saturated-unsaturated water flow and Mxnual advection dispersion equations for both heat and solute transport. The mesh generator may be used for defining very majual domain geometries, and for discretizing the transport domain into an unstructured finite element mesh.