1. General Model Information
Name: GIRL: General simulation of Reservoirs and Lakes
Main medium: aquatic
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: ordinary differential equations
Keywords: water quality, lakes, phosphorus
Dr. Milan Straskraba
Acad. Sci. Czech. Rep.
CZ-37005 Ceske Budejovice
Phone: 042 38 41 928
Fax : 042 38 45 985
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.
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
Operating System(s): DOS
Programming Language(s): FORTRAN
III. Mathematical Information
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