N3DADE

Metadata Updated: February 4, 2022

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

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Public: This dataset is intended for public access and use. License: Creative Commons CCZero

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Dates

Metadata Created Date	November 10, 2020
Metadata Updated Date	February 4, 2022

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Data.json Data.json Metadata
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Harvested from USDA JSON

Additional Metadata

Resource Type	Dataset
Metadata Created Date	November 10, 2020
Metadata Updated Date	February 4, 2022
Publisher	Agricultural Research Service
Maintainer	Skaggs, Todd
Identifier	8c6ace9f-1778-4b35-901b-ff45e9409862
Data Last Modified	2022-01-12
Public Access Level	public
Bureau Code	005:18
Metadata Context	https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version	https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby	https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id	e538436e-e9bb-4e44-91f4-2423d766e613
Harvest Source Id	d3fafa34-0cb9-48f1-ab1d-5b5fdc783806
Harvest Source Title	USDA JSON
License	https://creativecommons.org/publicdomain/zero/1.0/
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Program Code	005:040
Source Datajson Identifier	True
Source Hash	442f7fdfb203df7758b36773641e57b52b00ea96
Source Schema Version	1.1
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