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Global Change Master Directory (GCMD)
N3DADE Model: Nonequilibrium 3-Dimensional Advection-Dispersion Equation
Entry ID: USDA_ARS_N3DADE


Summary
Abstract: This research report documents the Fortran program N3DADE (Nonequilibrium
3-Dimensional Advection-Dispersion Equation) which may be used to evaluate
analytical solutions described by Leij et al. [1993]. The analytical solutions
pertain to selected cases of three-dimensional solute transport during steady
unidirectional water flow in porous media of semi-infinite length in the
longitudinal direction, and of infinite length in the transverse directions.
The solutions may also be applied to one- and two-dimensional problems.
Transport and flow properties of the medium are assumed to be macroscopically
uniform. Nonequilibrium solute transfer can occur between two domains in either
the liquid or the adsorbed phase. The transport equation contains terms for
solute movement by advection and dispersion, and for solute retardation,
first-order decay, and zero-order production. Solute concentrations are
calculated as a function of time and space in a three-dimensional Cartesian
coordinate system.

This report serves as both a user manual for the program and as documentation
of the general analytical solutions of the boundary, initial and production
value problems involved. A comprehensive set of specific solutions is presented
using Dirac, Heaviside and exponential functions to describe the initial,
boundary and production profiles. A rectangular or circular inflow area is
specified for the boundary value problem, while for the initial and production
value problems the respective initial and production profiles are defined for
parallelepipedal, cylindrical, or spherical regions of the soil. Solutions are
given for volume-averaged or resident concentrations, as well as for
flux-averaged or flowing concentrations.

The user manual gives a detailed description of the computer program, including
the subroutines used to evaluate the analytical solutions for optimizing model
parameters. Input and output files for all major problems are also included.

The manual provides:

-A list of main program variables
-The format of the input file
-Listings of sample input and output files
-The source code N3DADE.FOR

[Summary provided by the USDA.]

Related URL
Link: View Related Information
Description: Download form to access N3DADE Model.

ISO Topic Category
FARMING
GEOSCIENTIFIC INFORMATION


Keywords
Models
3D Visualization
Solute Transport
Soil Characteristics



Distribution
Distribution_Media: Online


Personnel
TYLER B. STEVENS
Role: SERF AUTHOR
Phone: 301-851-8113
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
5700 Rivertech Court
City: Riverdale
Province or State: MD
Postal Code: 20737
Country: USA


WALTER RUSSELL
Role: TECHNICAL CONTACT
Phone: 909-369-4850
Fax: 909-342-4964
Email: wrussell at ussl.ars.usda.gov
Contact Address:
U.S. Salinity Laboratory
USDA, ARS
450 West Big Springs Road
City: Riverside
Province or State: CA
Postal Code: 92507-4617
Country: USA


Publications/References
Leij, F. J. and N. Toride. 1997. N3DADE: A computer program for evaluating
three-dimensional nonequilibrium solute transport in porous media. U.S.
Salinity Laboratory Research Report 143, Riverside CA. 116 pp
Extended Metadata Properties
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Creation and Review Dates
SERF Creation Date: 2007-03-08
SERF Last Revision Date: 2007-03-08



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