Geovisualization of Mercury Contamination in Lake St. Clair Sediments
K. Wayne Forsythe,Chris Marvin,Christine J. Valancius,James P. Watt,Joseph Aversa,Stephen J. Swales,Daniel J. Jakubek,Richard R. Shaker +7 more
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In this paper, the authors focus on the geovisualization of total mercury pollution from sediment samples that were collected in 1970, 1974 and 2001, and assess contamination patterns, dot maps were created and compared with surfaces that were generated using the kriging spatial interpolation technique.Abstract:
The Laurentian Great Lakes of North America contain approximately 20% of the earth’s fresh water. Smaller lakes, rivers and channels connect the lakes to the St. Lawrence Seaway, creating an interconnected freshwater and marine ecosystem. The largest delta system in the Great Lakes is located in the northeastern portion of Lake St. Clair. This article focuses on the geovisualization of total mercury pollution from sediment samples that were collected in 1970, 1974 and 2001. To assess contamination patterns, dot maps were created and compared with surfaces that were generated using the kriging spatial interpolation technique. Bathymetry data were utilized in geovisualization procedures to develop three-dimensional representations of the contaminant surfaces. Lake St. Clair generally has higher levels of contamination in deeper parts of the lake, in the dredged shipping route through the lake and in proximity to the main outflow channels through the St. Clair delta. Mercury pollution levels were well above the Probable Effect Level in large portions of the lake in both 1970 and 1974. Lower contaminant concentrations were observed in the 2001 data. Lake-wide spatial distributions are discernable using the kriging technique; however, they are much more apparent when they are geovisualized using bathymetry data.read more
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References
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The Great Lakes
TL;DR: GeGeology of the Great Lakes By Prof. Jack L. Hough as mentioned in this paper. Pp. xviii + 313. 8.50 dollars. (Urbana, Illinois): University of Illinois
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A three-step model to assess shoreline and offshore susceptibility to oil spills: the South Aegean (Crete) as an analogue for confined marine basins.
TL;DR: The results in this paper show that zones of high to very-high susceptibility around the island of Crete are related to: offshore bathymetric features, including the presence of offshore scarps and seamounts; shoreline geology, and the presence near the shore of sedimentary basins filled with unconsolidated deposits of high permeability.
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Spatial and Temporal Trends in Sediment Contamination in Lake Ontario
TL;DR: A Lake Ontario sediment survey was conducted in 1998 to characterize spatial and temporal trends in contamination, and for comparison with data from previous surveys in order to assess any changes in environmental quality since the advent of measures to reduce contaminant sources as mentioned in this paper.
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Trends in spatial and temporal levels of persistent organic pollutants in Lake Erie sediments.
TL;DR: Levels of organic contaminants in sediments in some areas of Lake Erie still exceeded the strictest Canadian Federal and Ontario Provincial guidelines in 1997, however, exceedances of guidelines describing contaminated environments in 1997 were predominantly restricted to the western basin and near-shore sites in the southern part of the central basin.
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Spatial Distributions of Legacy Contaminants in Sediments of Lakes Huron and Superior
Sarah B. Gewurtz,Sarah B. Gewurtz,Li Shen,Li Shen,Paul A. Helm,Jasmine Waltho,Eric J. Reiner,Scott Painter,Ian D. Brindle,Chris Marvin,Chris Marvin +10 more
TL;DR: The sediments of Lake Superior, Lake Huron, and Georgian Bay were sampled in 2001 and 2002 in order to evaluate the extent of surficial sediment contamination of polychlorinated biphenyls (PCBs), organochlorine pesticides (OCs), polycyclic aromatic hydrocarbons (PAHs), and metals as discussed by the authors.