1. General Model Information

Name: QUAL2Kw A framework for modeling water quality in streams and rivers using a genetic algorithm for calibration.

Acronym: QUAL2KW

Main medium: aquatic
Main subject: biogeochemistry
Organization level: Ecosystem
Type of model: ordinary differential equations
Main application: simulation/optimisation tool, decision support/expert system, research
Keywords: nutrient cycles, eutrophication, dissolved oxygen, periphyton, phytoplankton, variable stoichiometry, luxury uptake, genetic algorithm, organic carbon, nitrogen, phosphorus, reaeration, temperature, heat budget


Greg Pelletier
Department of Ecology, P.O. Box 47710, Olympia, WA, 98504-7710

Phone: 360-407-6485
Fax: 360-407-6884
email: gpel461@ecy.wa.gov
Homepage: http://www.ecy.wa.gov/programs/eap/models/


Gregory J. Pelletier, Steven C. Chapra, and Hua Tao


QUAL2Kw is a framework for the simulation of water quality in streams and rivers. Dynamic diel heat budget and water quality kinetics are calculated for one-dimensional steady-flow systems. The framework includes a genetic algorithm to facilitate the calibration of the model in application to particular waterbodies. The genetic algorithm is used to find the combination of kinetic rate parameters and constants that results in a best fit for a model application compared with observed data. The QUAL2Kw framework allows up to three steady-flow synoptic survey data sets to be simultaneously calibrated to the same set of kinetic rate parameters and constants.

QUAL2Kw is a modernized version of the QUAL2E model (Brown and Barnwell 1987). QUAL2Kw is adapted from the QUAL2K model that was originally developed by Dr. Steven C. Chapra of Tufts University (Chapra and Pelletier, 2003). The QUAL2Kw framework includes the following elements:

II. Technical Information

II.1 Executables:

Operating System(s): Microsoft Windows (and Excel)
download at: http://www.ecy.wa.gov/programs/eap/models/

II.2 Source-code:

Programming Language(s): Microsoft Excel VBA, Fortran 95

II.3 Manuals:

QUAL2Kw theory and documentation: A modeling framework for simulating river and stream water quality
download at: http://www.ecy.wa.gov/programs/eap/models/

II.4 Data:

The distribution files include example applications.

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: : Wed Apr 6 01:51:29 2005
Status of the document: Contributed by Greg Pelletier
last modified by Joachim Benz Fri May 6 14:09:53 CEST 2005

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