10.2190/QPUD-3JFR-0P2E-EV9D QPUD3JFR0P2EEV9D 5 A One Dimensional Mass Transport Model for Natural Rivers 139 154 20020509 20020509 20020509 20020509 QPUD3JFR0P2EEV9D.pdf http://baywood.metapress.com/link.asp?target=contribution&id=QPUD3JFR0P2EEV9D 2 Mustafa M. Aral School of Civil Engineering, Georgia Institute of Technology A numerical computer model is developed using the finite element method to analyze one dimensional transport of radioactive pollutants in natural rivers. The model generated includes some routines to predict the longitudinal diffusion coefficient as a default value, given some kinematic constants. Also, decay constants are generated as default value, given the specification of the radioactive material under study. The present paper summarizes the initial steps taken toward the goal of preparing a user-oriented computer model which will be available for use in cases of emergency, to predict the mass transport of pollutants in natural rivers with limited input data. Case studies analyzed indicate that quite accurate predictions can be made as initial estimates of the magnitude of concentration distribution as it varies through time by employing a model of this kind. C. A. Little and C. W. Miller, The Uncertainty with Selected Environmental Transport Models, <i>Oak Ridge National Laboratory Health and Safety Division, ORNL-5528</i>, 1979. M. M. Aral, P. G. Mayer, and M. L. Maslia, Mathematical Modeling of Aquatic Dispersion of Effluents, prepared for Health and Safety Division of Oak Ridge National Laboratories, <i>Georgia Institute of Technology Report No. E-20-604</i>, July 1980. H. B. Fisher, J. E. List, R. C. Y. Koh, J. Imberger, and N. H. Brooks, <i>Mixing in Inland and Coastal Waters</i>, Academic Press, New York, 1979. R. B. Bird, W. E. Stewart, and E. N. Lightfoot, <i>Transport Phenomena</i>, John Wiley and Sons, Inc., New York, 1960. H. Liu, Predicting Dispersion Coefficient of Streams, <i>Proc. ASCE, Jr. of the Env. Eng. Div., EE 1</i>, pp. 59-69, 1977. R. S. Booth, A Compendum of Radionuclides Found in Liquid Effluents of Nuclear Power Stations, <i>Oak Ridge National Laboratory Instrumentation and Control Division, ORNL-TM-3801</i>, 1975. O. C. Zienkiewicz, <i>The Finite Element Method in Engineering Science</i>, McGraw Hill Company, New York, 1971. E. L. Wilson and R. W. Clough, Dynamic Response by Step-by-Step Matrix Analysis, <i>Symp. on the Use of Comp. in Civil Eng.</i>, Lisbon, 1962. R. G. Godfrey and B. J. Frederick, Dispersion in Natural Streams, <i>U. S. Geological Survey Professional Paper, 433-K</i>, 1970.