1. General Model Information
Name: Computer Model of Two-Dimensional Contaminant Transport under the influence of oxygen-limited biodegradation
Main medium: terrestrial
Main subject: biogeochemistry, hydrology
Organization level: ecosystem
Type of model: partial differential equations (finite differences,2D),
Keywords: groundwater, pollution, solute transport, oxygen limited biodegradation, convection-dispersion equation, method of characteristics, sink terms
Department of Environmental Sciences andEngineering
P.O. Box 1892, Houston, Texas 77251
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
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:
Download BIOPLUME II Documentation (PDF-Format) (362626 bytes)The Adobe Acrobat Reader is available Free from Adobe
III. Mathematical Information
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