SWMS-3D

Metadata Updated: February 4, 2022

SWMS_3D is a computer program for simulating water and solute movement in three-dimensional variably saturated media. The program numerically solves the Richards' equation for saturated-unsaturated water flow and the convection-dispersion equation for solute transport. The flow equation incorporates a sink term to account for water uptake by plant roots. The transport equation includes provisions for linear equilibrium adsorption, zero-order production, and first-order degradation. The program may be used to analyze water and solute movement in unsaturated, partially saturated, or fully saturated porous media. SWMS_3D can handle flow regions delineated by irregular boundaries. The flow region itself may be composed of nonuniform soils having an arbitrary degree of local anisotropy. The water flow part of the model can deal with prescribed head and flux boundaries, as well as boundaries controlled by atmospheric conditions. The governing flow and transport equations are solved numerically using Galerkin-type linear finite element schemes. Depending upon the size of the problem, the matrix equations resulting from discretization of the governing equations are solved using either Gaussian elimination for banded matrices, or a conjugate gradient method for symmetric matrices and the ORTHOMIN method for asymmetric matrices. The program is written in ANSI standard FORTRAN 77. Computer memory is a function of the problem definition, mainly the total number of nodes and elements. The program comes with a user manual giving detailed instructions for data input preparation. Example input and selected output files are also provided.

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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

Metadata Source

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	b55fb522-c654-467e-ab98-c5775560e16d
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	32162c56-a077-49bb-85a3-bc9678f45631
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	200d3d89b5ceff269452e6310b8e2e6747d4fbf5
Source Schema Version	1.1
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