1. General Model Information

Name: Computational Aquatic Ecosystem DYnamics Model

Acronym: CAEDYM

Main medium: aquatic
Main subject: ecology, other, biogeochemistry, population dynamics
Organization level: Ecosystem
Type of model: not specified (3D), difference equations (1D), partial differential equations (finite differences)
Main application: simulation/optimisation tool, research,
Keywords: ecosystem, water quality


David Horn
Centre for Water Research, University of Western Australia
Phone: +61 8 9380 1684
Fax: +61 8 9380 1015
email: horn@cwr.uwa.edu.au


David Hamilton and Michael Herzfeld


The Computational Aquatic Ecosystem Dynamics Model (CAEDYM) is an aquatic ecological model that may be run independently or coupled with hydrodynamic models DYRESM or ELCOM. CAEDYM consists of a series of mathematical equations representing the major biogeochemical processes influencing water quality. At its most basic, CAEDYM is a set of library subroutines that contain process descriptions for primary production, secondary production, nutrient and metal cycling, and oxygen dynamics and the movement of sediment.

CAEDYM configuration is flexible so that the user can focus on the processes of interest. For example, the model can be configured for a simple set of nutrients-phytoplankton-zooplankton. By simulating several state variables at the species level, CAEDYM can be used to support the understanding and management of a system. In addition, the model can be coupled to the one-dimensional hydrodynamic model (DYRESM) for studies of the seasonal, annual or decadal variation in water quality. For more detailed spatial information, CAEDYM can be run with the three-dimensional hydrodynamic model ELCOM. To maximize speed and memory requirements CAEDYM shares a common internal data structure with both DYRESM and ELCOM. They also use common output data storage formats, and share common Graphical User Interface (GUI) and visualization routines for configuring the model and displaying the results.

DYRESM-CAEDYM is presently being used in 24 countries around the world. It can be downloaded as freeware.

II. Technical Information

II.1 Executables:

Operating System(s): Windows 95/98, Windows NT, Linux, DEC Unix, (MacOS X forthcoming)

II.2 Source-code:

Programming Language(s): Fortran 95

II.3 Manuals:

CAEDYM Science Manual; CAEDYM Users Manual; CAEDYM Programmers Manual

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

(All state variables can be optionally siwtched on or off)
Phytoplankton: up to seven groups
Dissolved Oxygen Biochemical Oxygen Demand ("fast" and "slow")
Nutrients (NH4, NO3, PO4, TP, TN and internal phytoplankton N, P and C)
Suspended Solids: two groups
Zooplankton: up to five groups
Fish: up to nine groups Jellyfish Seagrasses/Macrophytes
Macroinvertebrates (bivalves, polychaetes and crustacean grazers)
Metals: Iron, Manganese and Aluminium

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: Thu Mar 22 07:33:45 2001
Status of the document: Barbara Robson

last modified by Tobias Gabele Wed Aug 21 21:44:40 CEST 2002

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