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SWMS-3D

model

posted on 2024-02-15, 18:30 authored by U.S. Salinity Laboratory

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.

Resources in this dataset:

Resource Title: SWMS-3D download page.

File Name: Web Page, url: https://www.ars.usda.gov/research/software/download/?softwareid=104&modecode=20-36-15-00

Funding

USDA-ARS

History

Data contact name

Skaggs, Todd

Data contact email

Todd.Skaggs@ars.usda.gov

Publisher

United States Department of Agriculture

Temporal Extent Start Date

1994-01-01

Theme

Not specified

Geographic Coverage

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ISO Topic Category

environment

National Agricultural Library Thesaurus terms

computer software; solutes; Richards' equation; water flow; water uptake; roots; adsorption; porous media; soil; models; head; drainage; finite element analysis; computer hardware

OMB Bureau Code

005:18 - Agricultural Research Service

OMB Program Code

005:040 - National Research

Pending citation

No

Public Access Level

Public

Preferred dataset citation

U.S. Salinity Laboratory (2019). SWMS-3D. United States Department of Agriculture.

Usage metrics

Categories

Keywords

model Water Flow water saturation solute transport media data.gov ARS

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