Groundwater contributions to surface water in the Assiniboine Delta Aquifer (ADA): A water quantity and quality perspective |
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| Authors: | Serban Danielescu Florent Barbecot Victor Morand |
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| Affiliation: | 1. Canada Centre for Inland Waters, Environment and Climate Change Canada, Burlington, ON L7R 4A6, Canada;2. Fredericton Research and Development Centre, Agriculture and Agri-Food Canada, Fredericton, NB E3B 4Z7, Canada;3. GEOTOP, Département des sciences de la Terre et de l''atmosphère, Université du Québec à Montréal, Montreal, Quebec H3C 3P8, Canada;1. Environment and Climate Change Canada, 867 Lakeshore Rd., Burlington, Ontario L7S 1A1, Canada;2. Centre for Ecology and Hydrology, Wallingford, Oxfordshire OX10 8BB, UK;3. Department of Biology, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada;4. Wilfrid Laurier University, Faculty of Science, Biology, 75 University Ave West, Waterloo, ON N2L 3C5, Canada;1. Water Science and Technology Directorate, Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada;2. Agriculture and Agri-Food Canada, Fredericton Research and Development Centre, Coastal Region, Fredericton, New Brunswick E3B 4Z7, Canada;1. Brandon Research Centre, Agriculture and Agri-Food Canada, Science and Technology Branch, Brandon, MB R7A 5Y3, Canada;2. Environment and Climate Change Canada, National Hydrology Research Centre, Saskatoon, SK S7N 3H5, Canada;3. Department of Soil Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;4. Watershed Systems Research Program, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;5. Agriculture and Agri-Food Canada, Science and Technology Branch, Regina, SK S4P 0M3, Canada;1. Department of Biological Sciences, University of Manitoba, 50 Sifton Road, Winnipeg, MB R3T 2M5, Canada;2. Manitoba Conservation and Water Stewardship, Wildlife and Fisheries Branch, 200 Salteaux Crescent, Winnipeg, MB R3J 3W3, Canada;1. Department of Biology, University of Winnipeg, 515 Portage Ave., Winnipeg, MB R3B 2E9, Canada;2. Freshwater Institute, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, MB R3T 2N6, Canada;1. Water Science and Technology Branch, Environment and Climate Change Canada, 150-123 Main St., Winnipeg, Manitoba R3C 4W2, Canada;2. Dept. of Biological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;3. Water Science and Technology Branch, Environment and Climate Change Canada, St. Lawrence Centre, 105 McGill St., Montréal, Québec H2Y 2E7, Canada |
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| Abstract: | In the Lake Winnipeg Basin (LWB), at both basin and regional scales, there are currently gaps regarding the significance of groundwater as a mediator of nutrient and contaminant fluxes to Lake Winnipeg. During 2018, surface water and groundwater samples were collected from various locations across the largest sand and gravel aquifer (Assiniboine Delta Aquifer ADA]; 3800 km2) in the LWB as well as from surface water courses flowing above this aquifer. The samples collected during spring and fall were analyzed for anions and cations as well as for a series of isotopic and geochemical tracers (e.g. water isotopes, carbon 14, artificial sweeteners, pesticides, etc.). The results reveal that groundwater and the small watercourses flowing above the ADA have a similar chemical composition, which is in contrast with the chemical composition of the main watercourse flowing above the aquifer (Assiniboine River AR]). When corroborated with stream discharge measurements this indicates that groundwater plays a significant role at local scale in controlling both the flow and the chemical composition of the AR tributaries. Nitrate showed low to non-detectable concentrations in both groundwater and surface water. With respect to groundwater, this could be related to the reducing conditions in the deeper aquifer in conjunction with relatively large groundwater travel times of up to 2400 years. |
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| Keywords: | Nutrients Water quality Groundwater age Surface water Artificial sweeteners Assiniboine Delta Aquifer |
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