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Long-Term Hydrologic Sustainability of Calcareous Fens along the Glacial Lake Agassiz Beach Ridges, Northwestern Minnesota, USA

  • Wetland Hydrology and Geomorphology
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Abstract

Calcareous fens are peat-accumulating wetlands fed by calcium-rich groundwater that support several threatened species of plants that thrive in these geochemical conditions. This investigation characterized the hydrology of two calcareous fens in the Glacial Lake Agassiz beach ridge complex in northwestern Minnesota, USA. Sandy surficial beach ridge aquifers and underlying buried glacial aquifers were considered as sources of groundwater to the fen. A combination of the two sources influenced by seasonal hydrology was also considered. Synchronous hydrologic responses to rainfall events and hydraulic gradients indicate the calcareous fens are well-connected to the beach-ridge aquifers. Chemistry of water discharging to the fens is calcium-magnesium-bicarbonate type similar to the beach ridge aquifers, and distinct from buried aquifers that have significant sodium and chloride. High tritium values and oxygen isotope signatures similar to the beach ridge aquifers characterized fen water. Beach ridge aquifer complexes are relatively thin (8–10 m) and overlie thick clay/clay loam till. These beach ridges exhibit high seasonal recharge and have permanent saturated zones, providing a continual source of calcium-rich water for the fens. Electrical resistivity profiles characterized the glacial stratigraphy and highlighted the well-developed physical connection between beach ridge aquifers and calcareous fens. The results of this study allow evaluation of the potential impacts of irrigation and aggregate quarrying on calcareous fens along sand and gravel beach ridges.

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All data collected during this investigation including hydrology, water chemistry, and geophysics are included in the manuscript and accompanying supporting information.

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Acknowledgements

This research was funded by the Graduate School of the University of Minnesota and by the Geology Research Fund in the Department of Earth and Environmental Sciences at the University of Minnesota Duluth. The authors would like to thank Jason Ver Steeg of Duininck Companies, Keith Chisholm, and other landowners for access to their properties for the research project. Various departments and individuals at the University of Minnesota helped provide equipment and expertise as well as laboratory services that made this project possible. This includes the co-authors, Salli Dymond, John Pastor, Nate Johnson, Julie Agnich, the College of Food, Agricultural, and Natural Resource Science’s Research Analytical Lab, and the Natural Resources Research Institute. The U.S. Geological Survey lent the pressure transducers used for this project. The Tritium Laboratory at the University of Miami donated the tritium analyses used in this project through the Geological Society of America. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the University of Minnesota or the United States Government.

Funding

This project was supported with funds from the University of Minnesota Graduate School and the Geology Research Fund in the Department of Earth and Environmental Sciences, University of Minnesota Duluth.

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Nicholas Budde, Howard Mooers, and Timothy Cowdery contributed to the study conception and design. Installation of monitoring wells and recording equipment was conducted by Nicholas Budde and Howard Mooers, data collection and analysis were performed primarily by Nicholas Budde with help from Howard Mooers and a field assistant. Timothy Cowdery advised on methodology throughout the project. Nigel Wattrus provided geophysical equipment, advised on geophysical survey design, and processed geophysical data. The first draft of the manuscript was written by Nicholas Budde, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Nicholas R. Budde.

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Budde, N.R., Mooers, H.D., Cowdery, T.K. et al. Long-Term Hydrologic Sustainability of Calcareous Fens along the Glacial Lake Agassiz Beach Ridges, Northwestern Minnesota, USA. Wetlands 42, 28 (2022). https://doi.org/10.1007/s13157-022-01544-8

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