A Method for Evaluating New Drinking Water Intakes Using a Three Dimensional Pollutant Transport Model and Inverse Modeling
Library & Archives Canada, 2008 - 285 pages
The Great Lakes form an important freshwater drinking source for many urban areas surrounding the Lakes but also provide a sink for pollutants and runoff. Consequently introducing new drinking water intakes into any of these water bodies requires investigation into local pollutant sources and their transport in order to determine the most appropriate location and depth of any new intake. This thesis deals with using a three dimensional model to perform a comparative analysis of several potential drinking water intakes to be located along the north west shore of Lake Ontario between Toronto and Oshawa. The model is specifically used to assess each intake under both long and short-term transport of a potential pollutant release from the Pickering Nuclear Generating Station and potential and actual pollutant releases from a combination of local land sources respectively. To perform the analysis an estimate of grid diffusivity at the source, necessary for modeling pollutant transport on large grids, is developed; the model is enhanced to account for a wind drag coefficient that varies with fetch length; a correlation between field wind and field currents is generalized for Lake Ontario; a drogue analysis routine is developed to verify simulated currents; statistical analysis of long term currents and wind data in the region is performed; analysis of raw water quality is performed and; an inverse model is used to optimize the three dimensional model parameter values. Finally a process to evaluate new drinking water intakes is laid out and applied to the practical case of selecting a new drinking water intake along the north shore of Lake Ontario.
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