10.2190/U5QM-XY1Q-QX6P-MGNY U5QMXY1QQX6PMGNY 4 Modeling Lead Pollution In a Watershed — Ecosystem 339 349 20020509 20020509 20020509 20020509 U5QMXY1QQX6PMGNY.pdf http://baywood.metapress.com/link.asp?target=contribution&id=U5QMXY1QQX6PMGNY 4 Gary L. Rolfe Amar Chaker John Melin Ben B. Ewing Dept. of Forestry, University of Illinois Dept. of Civil Engineering, University of Illinois <p>An interdisciplinary study is currently in progress at the University of Illinois at Urbana-Champaign under a grant from the National Science Foundation RANN Program. Objectives of the study include understanding and modeling the movements and effects of heavy metals (initially lead) in the environment.</p><p>A model has been constructed which simulates the movements and predicts the accumulation points of lead in a 76-square mile watershed-ecosystem in Champaign County, Illinois. The model includes components of both aquatic and terrestrial ecosystems and represents the ecosystem by a network of nodes and branches where the nodes represent the components of the ecosystem in a general sense and the branches indicate possible transport mechanisms between nodes. Results of a two year simulation using a network of 36 nodes and 121 branches is presented.</p><p>The model provides a method for the study of pollutant transport and accumulation in ecosystems.</p> A. A. B. Pritsker and R. R. Burgess, "The GERT Simulation Programs: GERTS III, GERTS III Q, GERTS IIIC, and GERTS IIIR," Department of Industrial Engineering, Virginia Polytechnic Institute, 1970. S. H. Crandall, "Engineering Analysis," McGraw-Hill, New York, p. 41. Hardy Cross, "Analysis of Flow in Networks of Conduits or Conductors," Bulletin No. 286, Engineering Experiment Station, University of Illinois. S. J. Mason, "Feedback Theory: Some Properties of Signal Flow Graphs," Proceedings <i>IRE</i>, <b>41</b>(9), 1953.