HYDRUS 1D MANUAL PDF

Federal government websites always use a. The model is supported by an interactive graphics-based interface for data-preprocessing, discretization of the soil profile, and graphic presentation of the results. The HYDRUS program is a finite element model for simulating theone-dimensional movement of water, heat, and multiple solutes in variably saturated media. The program numerically solves the Richards' equation for saturated-unsaturated water flow and Fickian-based advection dispersion equations for heat and solute transport. TheSolute transport equations consider advective-dispersive transport in the liquid phase, and diffusion in the gaseous phase.

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Federal government websites always use a. The model is supported by an interactive graphics-based interface for data-preprocessing, discretization of the soil profile, and graphic presentation of the results. The HYDRUS program is a finite element model for simulating theone-dimensional movement of water, heat, and multiple solutes in variably saturated media.

The program numerically solves the Richards' equation for saturated-unsaturated water flow and Fickian-based advection dispersion equations for heat and solute transport.

TheSolute transport equations consider advective-dispersive transport in the liquid phase, and diffusion in the gaseous phase. The program may be used to analyze water and solute movement in unsaturated, partially saturated, or fully saturated porous media. The flow region itself may be composed of nonuniform soils. Flow and transport can occur in the vertical, horizontal, or a generally inclined direction.

The water flow part of the model can deal with constant or time-varying prescribed head and flux boundaries, boundaries controlled by atmospheric conditions, as well as free drainage boundary conditions. Soil surface boundary conditions may change during the simulation from prescribed flux to prescribed head type conditions and vice versa. For solute transport the code supports both constant and varying prescribed concentration Dirichlet or first-type and concentration flux Cauchy or third-type boundary conditions.

The dispersion coefficient includes terms reflecting the effects of molecular diffusion and tortuosity. Additional retention or hydraulic conductivity data, as well as a penalty function for constraining the optimized parameters to remain in some feasible region Bayesian estimation , can be optionally included in the parameter estimation procedure.

A Microsoft Windows-based graphical user interface GUI manages the input data required to run HYDRUS, as well as for nodal discretization and editing, parameter allocation, problem execution, and visualization of results.

The location of discretization nodes can be graphically edited by a user to optimize the thickness of different elements. The program includes controls to allow a user to build an application specific flow and transport model, and to perform graphical analyses on the fly. HYDRUS-1D offers graphs of the distribution of the pressure head, water content, water and solute fluxes, root water uptake, temperature and the concentration in the soil profile at preselected times.

Output also includes variable-versus-time plots, such as actual, potential and cumulative fluxes across boundaries or leaving the root zone. Simunek, K. Huang, M. Sejna , and M. Skaggs ars. Menu Agricultural Research Service U. Search small Search. TheFlow equation incorporates a sink term to account for water uptake by plant roots.

TheHeat transport equation considers conduction as well as convection with flowing water. The Unsaturated Soil Hydraulic Properties are described using van Genuchten [], Brooks and Correy [] and modified van Genuchten type analytical functions. Modifications were made to improve the description of hydraulic properties near saturation. This model assumes that drying scanning curves are scaled from the main drying curve, and wetting scanning curves from the main wetting curve. HYDRUS also implements a scaling procedure to approximate hydraulic variability in a given soil profile by means of a set of linear scaling transformations which relate the individual soil hydraulic characteristics to those of a reference soil.

Root growth is simulated by means of a logistic growth function. Water and salinity stress response functions can be defined according to functions proposed by Feddes et al. The governing flow and transport equations are solvednumerically using Galerkin type linear finite element schemes.

Integration in time is achieved using an implicit backwards finite difference scheme for both saturated and unsaturated conditions. Additional measures are taken to improve solution efficiency for transient problems, including automatic time step adjustment and adherence to preset ranges of the Courant and Peclet numbers.

The water content term is evaluated using the mass conservative method proposed by Celia et al. User Interface A Microsoft Windows-based graphical user interface GUI manages the input data required to run HYDRUS, as well as for nodal discretization and editing, parameter allocation, problem execution, and visualization of results.

Both input and output can be examined using graphical tools. File management is handled by a sophisticated project manager. Post-Processing Post-processing is also carried out in the shell.

Peripheral devices supported include most popular types of printers and plotters. A small catalog of soil hydraulic properties is included in the program. Extensive context-sensitive, online Help is part of the interface. Authors: J.

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Hydrus-1D, Version 3.0, Manual - PC-Progress

Federal government websites always use a. Menu Agricultural Research Service U. Search small Search. The one-dimensional profile is discretized using nodes. Infiltration is run for one day. 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 example is divided into three parts: A first, only water flow is considered, after which B solute transport is added.

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Here you can download the latest Hydrus-1D installation and several previous versions. Please let us know about any errors and bugs that you may encounter. We greatly appreciate your help. Thank you, Jirka and Mirek.

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