1. General Model Information

Name: Cornell Mixing Zone Expert System

Acronym: CORMIX

Main medium: aquatic
Main subject: (eco)toxicology,biogeochemistry
Organization level: ecosystem
Type of model: rule-based, not specified
Main application: decision support/expert system
Keywords: water, pollutant, lakes, reservoir, estuaries, costal water, hydrodynamic mixing zone model


Robert L. Doneker
Department of Environmental Science and Engineering
Oregon Graduate Institute of Science & Technology
20000 NW Walker Road, Beaverton, Oregon 97006-892

Phone: (503) 748-4053
Fax: (503) 748-1273
email: doneker@ese.ogi.edu
Homepage: http://www.ese.ogi.edu/~doneker/doneker.html



Cornell Mixing Zone Expert System (CORMIX) can be used for the analysis, prediction, and design of aqueous toxic or conventional pollutant discharges into diverse water bodies.
The major emphasis is on the geometry and dilution characteristics of the initial mixing zone -- including compliance with regulatory constraints --, but the system also predicts the behavior of the discharge plume at larger distances.

The highly user-interactive CORMIX system is implemented on IBM-DOS compatible microcomputers, utilizes a rule-based systems approach to data input and processing, and consists of three subsystems:
(a) CORMIX1 for the analysis of submerged single port discharges,

(b) CORMIX2 for the analysis of submerged multiport diffuser discharges and

(c) CORMIX3 for the analysis of buoyant surface discharges.

Without specialized training in hydrodynamics, users can make detailed predictions of mixing zone conditions, check compliance with regulations and readily investigate the performance of alternative outfall designs.
The basic CORMIX methodology relies on the assumption of steady ambient conditions. However, recent versions also contain special routines for the application to highly unsteady environments, such as tidal reversal conditions, in which transient recirculation and pollutant build-up effects can occur.

In addition, several post-processing options are available. These are CORJET (the Cornell Buoyant Jet Integral Model) for the detailed analysis of the near-field behavior of buoyant jets, FFLOCATR (the Far-Field Plume Locator) for the far-field delineation of discharge plumes in non-uniform river or estuary environments, and CMXGRAPH, a graphics package for plume plotting.

Several factors provided the original impetus for system development including:

(a) the considerable complexity of mixing processes in the aquatic environment, resulting from the great diversity of discharge and site conditions and requiring advanced knowledge in a specialized field of hydrodynamics;

(b) the failure of previously existing models (e.g. the U.S. EPA plume models (4) originally developed for municipal discharges in deep coastal waters) to adequately predict often routine discharge situations, especially for more shallow inland sites;

(c) the issuance in 1985 by the U.S. EPA of additional guidelines (1) for the permitting of toxic aqueous discharges, placing yet another burden on both applicants and regulators in delineating special zones for the initial mixing of these substances; and

(d) the availability of new computer methods, so-called expert systems, for making accessible to the user, within a simple personal computing environment, the expert's knowledge and experience in dealing with complex engineering problems.

Sources of the Abstract:
Gerhard H. Jirka, Robert L. Doneker, and Steven W. Hinton 1996: User's Manual For CORMIX: A Hydrodynamic mixing zone model and decision support system for pollutant discharges into surface waters. and
EPA-CEAM page (Jnue 18,1997)
see also: Orgeon Graduate Istitute, CORMX Home Page: http://steens.ese.ogi.edu/

II. Technical Information

II.1 Executables:

Operating System(s): DOS Included in self extracting archive: CORMIX Version 3.20, dated December 1996.(model/documentation)

Microsoft Windows 95/98/NT/2000: CORMIX-GI v 4.1E (17.3 MB) and Manuals: http://steens.ese.ogi.edu/downloads.html

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

Download complete archieve (see section II.1)

II.4 Data:

(see section II.1)

III. Mathematical Information

III.1 Mathematics

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: J. Bierwirth: 4.10.2000 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:41 CEST 2002

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