1. General Model Information

Name: Computer Model of Two-Dimensional Contaminant Transport under the influence of oxygen-limited biodegradation

Acronym: BIOPLUME2

Main medium: terrestrial
Main subject: biogeochemistry, hydrology
Organization level: ecosystem
Type of model: partial differential equations (finite differences,2D),
Main application:
Keywords: groundwater, pollution, solute transport, oxygen limited biodegradation, convection-dispersion equation, method of characteristics, sink terms


H.S. Rifai
Rice University
Department of Environmental Sciences andEngineering
P.O. Box 1892, Houston, Texas 77251
Fax :


Developers: H.S. Rafai, et al. (Rice University). The model is based on the 1987 version of the USGS two-dimensional method of characteristics transportmodel by Konikow and Bredehoeft.


BIOPLUME II is a two-dimensional model for simulation of transport of dissolved hydrocarbons under the influence of oxygen-limited biodegradation. The code also simulates reaeration and anaerobic biodegradation as a first order decay in hydrocarbon concentrations. The model is based on the 1987 version of the USGS two-dimensional method of characteristics transport model by Konikow and Bredehoeft. It computes the changes in concentration over time due to convection, dispersion, mixing, and biodegradation. BIOPLUME II solves the transport equation twice: once for hydrocarbon and once for oxygen. As a result, two plumes are computed at every time step. The model assumes instantaneous reaction between oxygen and hydrocarbon to simulate biodegradation processes. The two plumes are combined using the principle of superposition. The model allows injection wells to be specified as oxygen sources into a contaminated aquifer. It provides three additional sources of oxygen: 1) initial dissolved oxygen in the uncontaminated aquifer; 2) natural recharge of oxygen across the boundaries; and 3) vertical exchange of oxygen from the unsaturated zone (reaeration). The model comes with a menu-driven, interactive preprocessor and handles a 20 x 30 cell grid. The software includes a post processor which can convert output data to a format usable by commercial contouring packages. BIOPLUME II is distributed on DOS-formatted diskettes containing source code and executable image. The user's manual includes theory, installation instructions, input preparation instructions, and example applications.

II. Technical Information

II.1 Executables:

Operating System(s): Intel 80i86 based computer, 640 Kb RAM with a minimum of 550 Kb free RAM, mathcoprocessor, about 1 Mb free disk space for program files, and CGA graphics (text only). Program and Manual can be downloaded from US-EPA:

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

Download BIOPLUME II Documentation (PDF-Format) (362626 bytes)The Adobe Acrobat Reader is available Free from Adobe

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Rifai,H.S. et al.1988 Computer Model of Two-Dimensional Transport Under the Influence of OxygenLimited Biodegradation in Ground Water (Houston, TX: National Center for Ground WaterResearch, Rice University, 1988).
Rifai, H.S., P.B. Bedient, and J.T. Wilson 1989 "BIOPLUME models for Contaminant TransportAffected by Oxygen Limited Biodegradation," Environmental Research Brief,EPA/600/M-89/019, U.S. Environmental Protection Agency, Ada, OK (1989).

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: 16. 12. 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:39 CEST 2002

Go back to Register of Ecological Models (R E M)