1. General Model Information

Name: SSEM (a Shallow Sea Ecological Model)

Acronym: SSEM

Main medium: aquatic
Main subject: biogeochemistry, toxicology
Organization level:
Type of model: not specified
Main application:


Dr. Masahiko Sekine
Department of Civil Engineering
Yamaguchi University
Ube Yamaguchi 755
Phone: 81-836-31-5100 (ext. 3613)
Fax : 81-836-35-9429
email: ms@env.civil.yamaguchi-u.ac.jp



SSEM is programmed using an objekt-oriented programming language. SSEM has three major classes, BOX, COMPONETS and ECOMODEL. COMPONENTS represents the model component such as fish, plankton, nutrient, etc. BOX represents a water area that contains COMPONENTS in it. ECOMODEL represents a whole model that controls the time schedule of swimming, diffusion, and advection. SSEM describes an object water area as a connected set of BOXes. Physiological parameters for living COMPONENTS are maximum growth rate, half-saturation constant for food, faecal ratio, excretion ratio, respiration ratio, and death ratio. When you use the feature of movement by swimming, a set of preference parameters are also required. Forcing functions are water temperature, water current and nutrient load from land area. Not only those basic parameters but SSEM is intended to be able to handle special events in specific problems easily. For examble, you may define specifide as a member of COMPONENTS. In this case you just need to focus on the effect of pesticide. Other features such as growth or swimming are already defined and do you not need to think about them. In this sense, SSEM is not a completed model but a set of tools to model various areas of water.

Model purpose
SSEM is intended to be a modelling tool to predict the impact on fisheries caused by coastal development activities. It can handle many species of fish and their swimming, because each type of fish has a different value as a fishery resource and a different behaviour for the same impact.

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): UNIX, PC-DOS, MS-DOS, Windows

II.2 Source-code:

Programming Language(s):

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

Sekine, M., Nakanishi, H., Ukita, M. and Murakami, S., 1991. A shallow-sea ecological model using an object-oriented programming language. Ecol. Modelling, 57, 221-236.
Sekine, M., Nakanishi, H., and Ukita, M., 1991. A shallow-sea ecological model to assess the impact of coastal development. Extended Abstracts of 4th International Confrerence on Computing in Civil and Building Engineering, 189.
Sekine, M., Nakanishi, H. and Ukita, M., 1993. Study on fish mortality caused by the combined effects of pesticide and changes in environmental conditions. International Congress on Modelling and Simulation Proceedings, Vol. 4, pp. 1693-1698.

V. Further information in the World-Wide-Web

VI. Additional remarks

SSEM is intended to be apliccable to various situations from very simple to very complicated. However, while SSEM has already been tested in rather simple situations, it is very difficult to test it in complicated ecosystems because it requires a wide range of knowledge of physics, biology, chemistry, and/or ecology. Developers of the model hope that SSEM would be tried in various situations and the results be feed-backed. It would be pleasurable for the developers to cooperate with researchers who want to try SSEM.
Last review of this document by: R. Patzak : 01.September 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:50 CEST 2002

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