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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Elizabeth Flage and Joe Magner
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DOI:10.17265/2162-5263/2023.02.001
Affiliation(s)
Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, Minnesota 55108, USA
ABSTRACT
Wetlands have long been used as environmental indicators for changes in climate and land use because they are sensitive to hydrologic change; however, wetlands set in transmissive groundwater can be more resilient to climate and land use change. In Anoka County, Minnesota, USA, a monitoring network was established in 1997 and maintained by the Anoka Conservation District to the present day to assess wetland hydrologic response over time. We examined a combination of data including water level (stage) from these wetlands, precipitation from local gages, pan evaporation data, and historical land use, including a measure of runoff flashiness, using regression and k-mean analysis. Results did not detect any clear trends over a 25-year time period, though some p-values showed potential. A clear statistical trend in the measured hydrologic parameters would suggest exceedance beyond historical thresholds of natural hydrologic variation and alert the need to better protect wetlands and groundwater from anthropogenic stress. Study results may provide useful information to management and regulatory decisions for wetland systems set in sandy soils. This is particularly important for Anoka County because most wetlands are intrinsically connected to the surficial ASP (Anoka Sand Plain) Aquifer, which overlay vulnerable deeper aquifers used for domestic water supply.
KEYWORDS
Climate, land use, wetland, environmental indicator.
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