{"id":{"repo_id":"uwo","oai_identifier":"oai:uwo.scholaris.ca:20.500.14721/34259"},"canonical_url":"https://search.dev.ndltd.org/etd/uwo/oai:uwo.scholaris.ca:20.500.14721/34259","repository":{"repo_id":"uwo","name":"Western University","base_url":"https://uwo.scholaris.ca/server/oai/request"},"display":{"title":"A Regional Chemical Characterization and Analysis of Groundwater in Eastern Ontario","abstract":"This study utilizes 234 samples to provide a regional characterization and analysis of groundwater chemistry in eastern Ontario, Canada, where elevated TDS, Na and halogens occur in shallow groundwater. Water-types, PCA and mapping are used to investigate the processes and features controlling the chemistry. The chemical patterns are associated with glaciomarine deposits (extent, thickness) and bedrock topography, which modulate residence time and flow-path of groundwater. These determine the relative effects of recharge, ion exchange, salinization and organic breakdown on groundwater chemistry. Anomalous chemistry east of Ottawa (brackish-to-saline TDS; elevated water δ18O; elevated Na, Cl, I, CH4, pH, F) coincides with a major buried bedrock depression. Here, groundwater stagnation allows build-up of organic decomposition products and sustained residence of Pleistocene Champlain seawater with TDS up to 10400 ppm. This ambient baseline and identified natural and anthropogenic water quality threats and potential groundwater quantity issues will help support effective groundwater resource management.","abstract_html":"This study utilizes 234 samples to provide a regional characterization and analysis of groundwater chemistry in eastern Ontario, Canada, where elevated TDS, Na and halogens occur in shallow groundwater. Water-types, PCA and mapping are used to investigate the processes and features controlling the chemistry. The chemical patterns are associated with glaciomarine deposits (extent, thickness) and bedrock topography, which modulate residence time and flow-path of groundwater. These determine the relative effects of recharge, ion exchange, salinization and organic breakdown on groundwater chemistry. Anomalous chemistry east of Ottawa (brackish-to-saline TDS; elevated water δ18O; elevated Na, Cl, I, CH4, pH, F) coincides with a major buried bedrock depression. Here, groundwater stagnation allows build-up of organic decomposition products and sustained residence of Pleistocene Champlain seawater with TDS up to 10400 ppm. This ambient baseline and identified natural and anthropogenic water quality threats and potential groundwater quantity issues will help support effective groundwater resource management.","abstract_has_math":false,"creators":["Colgrove, Laura M"],"institution":"The University of Western Ontario","degree_name":"M Sc","degree_level":null,"degree_discipline":"Geology","degree_department":null,"school":null,"contributors":[],"advisors":["Fred J Longstaffe"],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-10-24","date_published":"2016-10-24","updated_at":"2026-07-27T21:56:16Z","subjects":["Groundwater","hydrogeology","salinity","Champlain Sea","halogens"],"languages":["en_ca"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/20.500.14721/34259","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Fred J Longstaffe"]},{"key":"dc:creator","label":"Author","values":["Colgrove, Laura M"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-07-10T20:01:29Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-07-10T20:01:29Z"]},{"key":"dc:date.issued","label":"Date","values":["2016-10-24"]},{"key":"dc:publisher","label":"Institution","values":["The University of Western Ontario"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M Sc"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Groundwater","hydrogeology","salinity","Champlain Sea","halogens"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_ca"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/20.500.14721/34259"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."]},{"key":"dc:description.abstract","label":"Abstract","values":["This study utilizes 234 samples to provide a regional characterization and analysis of groundwater chemistry in eastern Ontario, Canada, where elevated TDS, Na and halogens occur in shallow groundwater. Water-types, PCA and mapping are used to investigate the processes and features controlling the chemistry. The chemical patterns are associated with glaciomarine deposits (extent, thickness) and bedrock topography, which modulate residence time and flow-path of groundwater. These determine the relative effects of recharge, ion exchange, salinization and organic breakdown on groundwater chemistry. Anomalous chemistry east of Ottawa (brackish-to-saline TDS; elevated water δ18O; elevated Na, Cl, I, CH4, pH, F) coincides with a major buried bedrock depression. Here, groundwater stagnation allows build-up of organic decomposition products and sustained residence of Pleistocene Champlain seawater with TDS up to 10400 ppm. This ambient baseline and identified natural and anthropogenic water quality threats and potential groundwater quantity issues will help support effective groundwater resource management."]},{"key":"dc:title","label":"Title","values":["A Regional Chemical Characterization and Analysis of Groundwater in Eastern Ontario"]}]}],"canonical_facts":{"dc:contributor.advisor":["Fred J Longstaffe"],"dc:creator":["Colgrove, Laura M"],"dc:date.accessioned":["2025-07-10T20:01:29Z"],"dc:date.available":["2025-07-10T20:01:29Z"],"dc:date.issued":["2016-10-24"],"dc:description":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."],"dc:description.abstract":["This study utilizes 234 samples to provide a regional characterization and analysis of groundwater chemistry in eastern Ontario, Canada, where elevated TDS, Na and halogens occur in shallow groundwater. Water-types, PCA and mapping are used to investigate the processes and features controlling the chemistry. The chemical patterns are associated with glaciomarine deposits (extent, thickness) and bedrock topography, which modulate residence time and flow-path of groundwater. These determine the relative effects of recharge, ion exchange, salinization and organic breakdown on groundwater chemistry. Anomalous chemistry east of Ottawa (brackish-to-saline TDS; elevated water δ18O; elevated Na, Cl, I, CH4, pH, F) coincides with a major buried bedrock depression. Here, groundwater stagnation allows build-up of organic decomposition products and sustained residence of Pleistocene Champlain seawater with TDS up to 10400 ppm. This ambient baseline and identified natural and anthropogenic water quality threats and potential groundwater quantity issues will help support effective groundwater resource management."],"dc:identifier.uri":["https://hdl.handle.net/20.500.14721/34259"],"dc:language.iso":["en_ca"],"dc:publisher":["The University of Western Ontario"],"dc:subject":["Groundwater","hydrogeology","salinity","Champlain Sea","halogens"],"dc:title":["A Regional Chemical Characterization and Analysis of Groundwater in Eastern Ontario"],"dc:type":["thesis"],"thesis:degree_discipline":["Geology"],"thesis:degree_name":["M Sc"]},"updated_at":"2026-07-27T21:56:16Z"}