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Groundwater and surface water exchange and resulting Nitrate dynamics in the Bogue Phalia Basin in northwestern Mississippi

Journal of Environmental Quality
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Abstract

During April 2007 through September 2008, the USGS collected hydrogeologic and water-quality data from a site on the Bogue Phalia to evaluate the role of groundwater and surface-water interaction on the transport of nitrate to the shallow sand and gravel aquifer underlying the Mississippi Alluvial Plain in northwestern Mississippi. A two-dimensional groundwater/surface-water exchange model was developed using temperature and head data and VS2DH, a variably saturated flow and energy transport model. Results from this model showed that groundwater/surface-water exchange at the site occurred regularly and recharge was laterally extensive into the alluvial aquifer. Nitrate was consistently reported in surface-water samples (n = 52, median concentration = 39.8 μmol/L) although never detected in samples collected from in-stream piezometers or shallow monitoring wells adjacent to the stream (n = 46). These two facts, consistent detections of nitrate in surface water and no detections of nitrate in groundwater, coupled with model results that indicate large amounts of surface water moving through an anoxic streambed, support the case for denitrification and nitrate loss through the streambed.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Groundwater and surface water exchange and resulting Nitrate dynamics in the Bogue Phalia Basin in northwestern Mississippi
Series title Journal of Environmental Quality
Volume 41
Issue 1
Year Published 2012
Language English
Publisher Alliance of Crop, Soil, and Environmental Science Societies
Contributing office(s) Mississippi Water Science Center
Description 14 p.
First page 155
Last page 169
Country United States
State Mississippi
Other Geospatial Bogue Phalia Basin
Online Only (Y/N) N
Additional Online Files (Y/N) N
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