2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | CONNECTING HISTORIC LAND COVER TO GROUNDWATER SEEP NUTRIENT CONCENTRATIONS ACROSS STREAM SIZES | Virtual Platform
CONNECTING HISTORIC LAND COVER TO GROUNDWATER SEEP NUTRIENT CONCENTRATIONS ACROSS STREAM SIZES
Groundwater throughout the United States is saturated with excess nutrients infiltrating from overlying land cover. We used handheld thermal infrared cameras to extensively characterize locations of groundwater seeps (n > 300) throughout the Farmington River watershed. Groundwater was sampled from over 170 identified groundwater seeps for major anions, total nitrogen, denitrification, and greenhouse gases to understand spatial heterogeneity in the biogeochemistry of groundwater seeps and its relationship to surrounding watershed characteristics. We observed extensive spatial heterogeneity in groundwater biogeochemistry with some nitrate concentrations differing by 2 orders of magnitude at adjacent groundwater seeps within 10 m. We combined our spatially distributed biogeochemical data with a MODPATH groundwater particle-tracking model and historical landcover to connect groundwater residence times and flowpaths to source area landcover. We found that source area (r = -0.35, p <.05) and local buffer (r= -0.45, p<.05) percent forested landcover were associated with lower total nitrogen concentrations highlighting the role of riparian vegetation in reducing legacy nutrient loading from groundwaters to surface waters. Preliminary data suggests the broader range of inputs from source area landcover contributes to the spatial heterogeneity in groundwater seep biogeochemistry.
- Residence time
- Stream
- Biogeochemistry
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Presenters/Authors
Eric Moore
(), University of Connecticut, eric.m.moore@uconn.edu;
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Janet Barclay
(), USGS New England Water Science Center, Hartford, jbarclay@usgs.gov ;
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Kevin Jackson
(), University of Connecticut, kevin.jackson@uconn.edu ;
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Adam Haynes
(), University of Connecticut, adam.haynes@uconn.edu;
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Martin Briggs
(), U. S. Geological Survey, Hydrogeophysics Branch, Storrs, Connecticut, USA, mbriggs@usgs.gov;
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Ashley Helton
(), University of Connecticut, ashley.helton@uconn.edu;
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