Geologically controlled bi-directional exchange of groundwater with a hypersaline lake in the Canadian prairies
| Autor: | Lynn I. Kelley, Masaki Hayashi, Chris Holmden, Elena P. Zimmerman, Laurence R. Bentley |
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| Rok vydání: | 2016 |
| Předmět: |
Hydrology
geography Hydrogeology geography.geographical_feature_category 010504 meteorology & atmospheric sciences Groundwater flow 0208 environmental biotechnology Aquifer 02 engineering and technology Hypersaline lake Silt 01 natural sciences 6. Clean water 020801 environmental engineering Earth and Planetary Sciences (miscellaneous) Glaciolacustrine deposits Surface water Geology Groundwater 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Hydrogeology Journal. 24:877-892 |
| ISSN: | 1435-0157 1431-2174 |
| Popis: | Hypersaline lakes occur in hydrologically closed basins due to evaporitic enrichment of dissolved salts transported to the lakes by surface water and groundwater. At the hypersaline Lydden Lake in Saskatchewan, Canada, groundwater/lake-water interaction is strongly influenced by the geological heterogeneity of glacial deposits, whereby a highly permeable glaciofluvial sand/gravel deposit is underlain by glaciolacustrine deposits consisting of dense clay interspersed with silt/sand lenses. Pressure head distribution in a near shore area indicates a bi-directional flow system. It consists of topographically driven flow of fresh groundwater towards the lake in the sand/gravel aquifer and density-driven, landward flow of saline groundwater in the underlying glaciolacustrine deposits. Electrical resistivity tomography, and chemical and isotopic composition of groundwater clearly show the landward intrusion of saline water in the heterogeneous unit. The feasibility of bi-directional flow and transport is supported by numerical simulations of density-coupled groundwater flow and transport. The results suggest that the geologically controlled groundwater exchange processes have substantial influences on both inputs and outputs of dissolved minerals in hypersaline lakes in closed basins. |
| Databáze: | OpenAIRE |
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