Title
NUMERICAL MODELING OF REVERSING GROUNDWATER: USING LABORATORY DENITRIFICATION,Used
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Nitrate, typically derived from agricultural runoff and wastewater disposal, is the most widespread groundwater contaminant in the United States. A series of two and threedimensional finiteelement groundwater models are presented here to simulate groundwater nitrate transport and remediation in the Florida Keys, where wastewater injection is suspected of contributing to the deterioration of the offshore coral reef. These models include quantification of the hydrogeology of reversing groundwater flow due to tidal pumping and nitrate removal rates based on a new application of a molecular technique for measuring microbial respiration rates. Physical constraints on tidal pumping, including comparisons of net to total submarine groundwater discharge rates and the variabledensity mixing of recirculated seawater, were derived from observed tidal properties and published aquifer characteristics, with model calibration to previously conducted tracer experiments. The model demonstrates that even moderate tidal fluctuations are capable of driving reversing groundwater flow patterns, with net groundwater velocities and tracer distributions that closely match field measurements.
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