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Title: StAnMod


1
StAnMod
  • http//www.ussl.ars.usda.gov/models/stanmod/stanmo
    d.HTM

2
STANMOD
  • STANMOD (STudio of ANalytical MODels) is a public
    domain Windows-based computer software package
    for evaluating solute transport in porous media
    using analytical solutions of the
    convection-dispersion solute transport equation

http//www.ussl.ars.usda.gov/models/stanmod/stanmo
d.HTM
3
STANMOD
  • CXTFIT Toride et al.1995
  • For estimating solute transport parameters using
    a nonlinear least-squares parameter optimization
    method
  • Inverse problem by fitting a variety of
    analytical solutions of theoretical transport
    models, based upon the one-dimensional
    convection-dispersion equation (CDE), to
    experimental results
  • Three different one-dimensional transport models
    are considered
  • (i) the conventional equilibrium CDE
  • (ii) the chemical and physical nonequilibrium
    CDEs and
  • (iii) a stochastic stream tube model based upon
    the local-scale equilibrium or nonequilibrium CDE

http//www.ussl.ars.usda.gov/models/stanmod/stanmo
d.HTM
4
STANMOD
  • CHAIN van Genuchten 1985
  • For analyzing the convective-dispersive transport
    of solutes involved in sequential first-order
    decay reactions.
  • Examples
  • Migration of radionuclides in which the chain
    members form first-order decay reactions, and
  • Simultaneous movement of various interacting
    nitrogen or organic species

http//www.ussl.ars.usda.gov/models/stanmod/stanmo
d.HTM
5
STANMOD
  • 3DADE Leij and Bradford 1994
  • For evaluating analytical solutions for two- and
    three-dimensional equilibrium solute transport in
    the subsurface.
  • The analytical solutions assume steady
    unidirectional water flow in porous media having
    uniform flow and transport properties.
  • The transport equation contains terms accounting
    for
  • solute movement by convection and dispersion, as
    well as for
  • solute retardation,
  • first-order decay, and
  • zero-order production.
  • The 3DADE code can be used to solve the direct
    problem and the indirect (inverse) problem in
    which the program estimates selected transport
    parameters by fitting one of the analytical
    solutions to specified experimental data

http//www.ussl.ars.usda.gov/models/stanmod/stanmo
d.HTM
6
STANMOD
  • N3DADE Leij and Toride 1997
  • For evaluating analytical solutions of two- and
    three-dimensional nonequilibrium solute transport
    in porous media.
  • The analytical solutions pertain to
    multi-dimensional solute transport during steady
    unidirectional water flow in porous media in
    systems of semi-infinite length in the
    longitudinal direction, and of infinite length in
    the transverse direction.
  • Nonequilibrium solute transfer can occur between
    two domains in either the liquid phase (physical
    nonequilibrium) or the absorbed phase (chemical
    nonequilibrium).
  • The transport equation contains terms accounting
  • solute movement by advection and dispersion,
  • solute retardation,
  • first-order decay
  • zero-order production

http//www.ussl.ars.usda.gov/models/stanmod/stanmo
d.HTM
7
Download
  • http//www.pc-progress.cz/Fr_Hydrus.htm
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