1. General Model Information
Name: CemoS/Water - steady state model for chemical in rivers
Main medium: terrestrial
Main subject: (eco)toxicology, biogeochemistry
Type of model: compartment model
Keywords: water, exposure, river, sewage
Prof. Michael Matthies
University of Osnabrueck
Institute of Environmental Systems Research
49069 Osnabrueck, Germany
Fax : +49-541-969-2536
Dr. Stefan Trapp
Prof. Michael Matthies Email:email@example.com
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/Water is a steady-state model for the estimation of the pollution of a river by a chemical, caused by a sinufis/gle continuous pollution source like the emission of sewage into the river. The concentration profile and the mass balance of the chemical in the river, as well as the concentrations in the sediment and in the biota living in the river (e.g. fishes), are calculated. Thereby stationary conditions for the water flow and the material flow are assumed. Advection of the chemical and the following elimination processes are taken into consideration: degradation, sedimentation and volatilization.
principles of the model
The concentration profile of a chemical in a river, caused by a sinufis/gle emission source, is described by an analytical equation, derived from the mass balance in the river. Thereby all elimination processes are described by an aggregated first-order degradation rate (dC/dt = \partial C/\partial x \cdot v_f = -\lambda \cdot C, where C is the concentration of the chemical, v_f the current velocity of the river, x the distance from the point of emission and \lambda the aggregated elimination rate.). The sorption of the chemical on suspended material as well as the concentrations in the sediment and in the fishes are calculated from the concentration in the water with the help of partition coefficients.
Author of Abstract: UFIS - Environmental Research Information System
II. Technical Information
Operating System(s): MS-DOS Type of computer: PC Disc space: 1 MB List of files: CEMOS.EXE main program CEMOS.OVR STDSUB.DAB substance data EGAVGA.BGI graphic file CEMOS.HLP help file CEMOS.RES string file
Programming Language(s): Borland pascal 7.0
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.
III. Mathematical Information
This is a list of model equations sorted by their characteristics with hypertext links for more details.
This is a list of model quantities sorted by their characteristics with hypertext links for more details.
Bruggemann, R., Trapp, S., 1988. Release and Fate of Highly Volatile Solvents in the River Main. Chemosphere 17 (10): 2029-2041.
Chiou, C.T., Peters, J.L. and Freed, V.H., 1979. - Science 206 (1979), 831 ff.
Isnard, P., Lamber, S., 1988. Estimating Bioconcentration Factors from Octanol-Water Partition Coefficients and Aqueous Solubility. Chemosphere 17(1): 21-34.
Karickhoff, S.W., 1981. Semi-Empirical Estimation of Sorption of Hydrophobic Pollutants on Natural Sediments and Soils. Chemosphere 10, Pergamon, Oxford, UK. pp. 833-846.
Kenaga, E.E., Goring, C.A.I., 1980. Relationship Between Water Solubility, Soil-Sorption, Octanol-Water Partitioning, and Bioconcentration of Chemicals in Biota. Pre-publication copy, given at the Third Aquatic Toxicology. American Society for Testing and Material.
Lyman, W., Reehl, W., Rosenblatt, D., 1990. Handbook of Chemical Property Estimation Methods. McGraw-Hill, New York.
Mackay, D., Yuen, T.K., 1980. Volatilization Rates of Organic Contaminants from Rivers. Water Poll. Res. J. of Canada 15. 89 ff.
Schwarzenbach, R., Westall, J., 1981. Transport of Nonpolar ORganic Compounds from Surface Water to Groundwater: Laboratory Sorption Studies. Environ. Sci. Technol. 15: 1360-1367
Southworth, G.R., 1979. The Role of Volatilization in Removing Polycyclic Aromatic Hydrocarbons from Aquatic Environments. Bull. Environ. Contam. Toxicol. 21: 507-514.
Tinsley, I., 1979. Chemical Concepts in Pollutant Behaviour. John Wiley & Sons, New York.
Whitman, W.G., 1923. A Preliminary Experimental Confirmation of the Two-Film-Theory of Gas Adsorption. Chem. Metall. Eng. 29: 146-148.
Projektgruppe Exposmod. 1995. CemoS Handbuch.(in german)
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: R.Patzak : 6.August 1997 -
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:40 CEST 2002