1. General Model Information

Name: Adrian Brown Consultants Finite Element Model

Acronym: ABCFEM

Main medium: terrestrial
Main subject: biogeochemcal, hydrology
Organization level: ecosystem
Type of model: partial differential equations (finite elements,2D)
Main application:
Keywords: groundwater flow, unconfined aquifer, transient state, solute transport, 2D, saturated, finite element numerics, random walk model, Gauss-Seidel iteration


A. Brown and R. Hetzman
Adrian Brown Consultants Inc
Denver, Colorado
Phone: +1 303 399 9630
Fax :


A. Brown and R. Hetzman


2D finite element, flow and transport model. The program can be used for the solution of flow problems or it can be used to analyse flow and solute transport together in a single domain. Steady state or transient groundwater flow systems can be analysed including pumping or injection wells. Boundary conditions handled by the program include fixed flow, fixed head, forced inflow, infiltration and swamping. For unconfined systems a moving phreatic surface can be simulated allowing for mixtures of confined and unconfined nodes (as long as confined nodes remain fully saturated). The ability for the phreatic surface to move creates the possibility for groundwater to emerge at the ground surface forming a spring or stream. Heads can also be constrained below ground surface. This makes it possible to model stream/ground water interactions and gaining/losing streams. Inclined plane analysis for horizontal systems, vertical section analyses based on head differences and radial analyses. Menu driven, and may also be run in batch mode. Interactive graphical interface built in, which allows data input, mesh generation, data editing, data and results output and display. Files are in or can be converted to spreadsheet format, for additional pre- and post-processing manipulation. Supports a variety of printers and plotters and can create output files compatible with contouring packages and DXF formats for further analyses and presentation. The documentation consists of installation instructions, theory, input instructions, and example problems.

II. Technical Information

II.1 Executables:

Operating System(s): DOS

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

The flow problem is solved using a modified Gauss-Seidel iterative finite element approach and the transport problem is solved using a Random Walk approach.

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele, 16. 6. 1997
Status of the document:
last modified by Joachim Benz Thu Oct 5 20:17:52 CEST 2006

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