1. General Model Information

Name: GIRL: General simulation of Reservoirs and Lakes

Acronym: GIRL

Main medium: aquatic
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: ordinary differential equations
Main application:
Keywords: water quality, lakes, phosphorus


Dr. Milan Straskraba
Biomathematical Laboratory
Acad. Sci. Czech. Rep.
Branisouska 31
CZ-37005 Ceske Budejovice
Czech Republic
Phone: 042 38 41 928
Fax : 042 38 45 985
email: stras@entu.cas.cz



A generalized simple lake model consisting of three equations describing phosphorus as limiting element, and phytoplankton and zooplankton in uniformly mixed layers of water with specified depth (MIX) is developed. The reservoir/lake due to variable throughflow (Q/V), extinction coefficient of rates for, light and annually varying temperature. Annual changes of sedimentation are expressed by means of the function PIDI. Geographical location is given by annual changes of temperature, radiation and photoperiod. Inflow of phosphorus, algae and zooplankton are inputs.

Model purpose
To investigate some general features of lake ecosystems, particular for management purposes.

Source of the Abstract:
Joergensen S.E., B. Halling-Soerensen and S.N Nielsen (Edts.) 1996: Handbook of Environmental and Ecological Modelling. CRC Press Boca Raton et al. 672 pp.

II. Technical Information

II.1 Executables:

Operating System(s): DOS

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Kmet, T., and Straskraba, M., 1989. Global behaviour of a generalized aquatic ecosystem model. Ecol. Modelling, 45: 95-110.
Kalime et al., 1982. An optimization model for the economic control of reservoirs eutrophication. Ecol. Modelling, 17: 121-128.
Straskraba, M., 1985. Managing of eutrophication by means of ecotechnology and mathematical modelling. International Congress "Lakes Pollution and Recovery", Rome, 15th- 18th April, 1985: 17-28.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: Oct 15. 1998
Status of the document: -
last modified by Tobias Gabele Wed Aug 21 21:44:44 CEST 2002

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