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TitleUsing 222-radon surveys and regional scale groundwater models to evaluate groundwater discharge to Lake Simcoe
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AuthorRobinson, C; Wallace, H; Wexler, E J; Malott, S
SourceRegional-Scale Groundwater Geoscience in Southern Ontario: An Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario Geoscientists Open House; by Russell, H A J; Ford, D; Holysh, S; Priebe, E H; Geological Survey of Canada, Open File 8528, 2019 p. 23, https://doi.org/10.4095/313597 (Open Access)
Year2019
Alt SeriesOntario Geological Survey, Open File Report 6349
PublisherNatural Resources Canada
PublisherGovernment of Ontario
MeetingRegional-Scale Groundwater Geoscience in Southern Ontario: Open House; Guelph; CA; February 27-28, 2019
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Russell, H A J; Ford, D; Holysh, S; Priebe, E H; (2019). Regional-Scale Groundwater Geoscience in Southern Ontario: An Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario Geoscientists Open House, Geological Survey of Canada, Open File 8528
File formatpdf
ProvinceOntario
NTS31D/03; 31D/04; 31D/05; 31D/06; 31D/11; 31D/12
AreaLake Simcoe
Lat/Long WENS -80.0000 -79.0000 44.7500 44.0000
Subjectshydrogeology; surficial geology/geomorphology; environmental geology; groundwater; aquifers; groundwater resources; groundwater regimes; groundwater discharge; discharge rates; isotopic studies; isotopes; radon; surface waters; lakes; shorelines; water quality; pollutants; models; permeability; sediments; glacial deposits; moraines; land use; planning; groundwater recharge areas; groundwater-surface water interaction; Phanerozoic; Cenozoic; Quaternary
Released2019 02 08
AbstractGroundwater discharge can be an important pathway for delivering pollutants to large lakes, but this pathway is often overlooked. To understand the potential impact of groundwater inputs on lake water quality, the volume of groundwater discharge, the spatial distribution of this discharge, and the history of the discharging groundwater must be quantified. This study uses offshore 222-radon surveys together with regional scale numerical groundwater models to evaluate groundwater discharge to Lake Simcoe. In-lake 222-radon concentration data was first used to identify groundwater discharge hotspots along the shoreline and quantify groundwater discharge rates. The 222-radon results, which compared well with the regional scale numerical model results, were then used to provide insights into hydrogeological factors controlling groundwater discharge to Lake Simcoe. Key factors included the permeability of nearshore sediments, proximity of the shoreline to moraine recharge areas, absence of streams along the shoreline, and presence of tunnel channel aquifers. Finally, the numerical model along the north shoreline of Lake Simcoe was applied to characterize groundwater discharge pathways, evaluate the land use in the recharge areas, and assess potential impacts of the groundwater inputs on lake water quality trends. The study presents a robust approach for regional scale evaluation of groundwater discharge to large lakes.
GEOSCAN ID313597