1. General Model Information

Name: CemoS/Soil - transport/residing of chemical in soil


Main medium: terrestrial
Main subject: (eco)toxicology, biogeochemistry
Organization level: ecosystem
Type of model: partial differential equations (1D)
Main application: decision support/expert system, research
Keywords: soil, contamination, transport of a chemical, exposure, analytical solution


Prof. Michael Matthies
University of Osnabrueck
Institute of Environmental Systems Research
Artilleriestr 34
49069 Osnabrueck, Germany
Phone: +49-541-9692574
Fax : +49-541-969-2599
email: matthies@ramses.usf.Uni-Osnabrueck.DE


Guido Baumgartner
Bernhard Reiter
Sven Scheil
Stefan Schwartz
Jan-Oliver Wagner
Dr. Stefan Trapp
Prof. Michael Matthies Email:cemos@skylla.mathematik.uni-osnabrueck.de


contents of the model
The model is part of the model package CemoS, a program system for exposure concentration estimates of environmentally hazardous chemicals. CemoS/Soil is a dynamical model for the description of the transport and the residing of a chemical in a soil column. The model can be used in three situations: 1. a sinufis/gle input of a chemical at the soil surface; 2. transport from a contaminated soil layer into deeper layers; 3. transport and residing in case of a continuous injection. Besides the concentration profile of the chemical in the soil the model calculates the fractions of the chemical in the soil-water, the soil-air and the soil-matrix. Further outputs are the velocity of the verticaltransport of the chemical and the total diffusion-/dispersion coefficient of the chemical in the soil.
principles of the model
The basis of the model is the one dimensional 'advection-diffusion/dispersion-equation'. This equation describes the dynamic behaviour of a chemical under steady state water transport regime by neufis/glecting the transient water flow and changing water content in soil over time. CemoS/Soil uses three analytical solutions of this equation, found for specific boundary conditions. The velocity of the vertical transport of the chemical is estimated from the Darcy water flux (calculated from the water balance at the soil surface assuming stationary water flow).

Author of Abstract: UFIS - Environmental Research Information System

II. Technical Information

II.1 Executables:

Operating System(s): MS-DOS Type of computer: PC RAM required: about 150 K Disc space: 1MB List of files: CEMOS.EXE executeable program CEMOS.OVR STDSUB.DAB substance data EGAVGA.BGI graphic file CEMOS.HLP help file CEMOS.RES string file

II.2 Source-code:

Programming Language(s): Borland Pascal 7.0

II.3 Manuals:

Manual: Trapp, St. ; Matthies, M.: Dynamik von Schadstoffen - Umweltmodellierung mit Cemos, Springer, Berlin (1996). ISBN 3-540-59312-8. Complete model documentation: Trapp, St. ; Matthies, M.: Dynamik von Schadstoffen - Umweltmodellierung mit Cemos, Springer, Berlin (1996). ISBN 3-540-59312-8.
Projektgruppe Exposmod. 1995. CemoS Handbuch.(in german)

II.4 Data:

III. Mathematical Information

III.1 Mathematics

This is a list of model equations sorted by their characteristics with hypertext links for more details.

III.2 Quantities

This is a list of model quantities sorted by their characteristics with hypertext links for more details.

III.2.1 Input

III.2.2 Output

IV. References

Abramowitz, M., Steghun, I. Handbook of Mathematical Functions with Formulas, Graphs and Mathematical Tables,10th ed. National Bureau of Standards, USA, John Wiley and Sons, New York.

Benzler, J.H., Finnen, H., Mueller, W., Roeschmann, G., 1982. Bodenkundliche Kartieranleitung. Bundesanstalt fur Geowissenschaften und Geologische Landes\"amter in der BRD, Hannover.

Bear, J., 1972.Dynamics of Fluids in Porous Media
Elsevier, Amsterdam 1972

Crank, J., 1979.The Mathematics of Diffusion, 2nd ed.
Oxford University Press, London.

Junge, C.E., 1977. Basic Considerations About Trace Constituents in the Atmosphere as related to the Fate of GlobalPollutants. In: Fate of Pollutants in the Air and W, Suffet, I.H. (editors), Wiley, New York 1977, pp. 7-26

Matthies, M., Behrendt, H., Muenzer, B., 1987. EXSOL - Modell fuer den Transport und Verbleib von Stoffen im Boden. GSF-Bericht 23/87, GSF Forschungszentrum fuer Umwelt und Gesundheit (editors), GSF-Forschungszentrum fuer Umwelt und Gesundheit, Oberschleissheim 1987 ISBN 0721-1694.

Millington, R.J., Quirk, J.M., 1961.Permeability of Porous Soils.
Trans. Faraday Soc. 57, 1200-1207.

Projektgruppe Exposmod. 1995. CemoS Handbuch.(in german)

V. Further information in the World-Wide-Web

VI. Additional remarks

Additional information
Last review of this document by: R. Patzak : 1.October 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:40 CEST 2002

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