NDLI: Effects of Microtopographically Concentrated Recharge on Nitrate Variability in a Confined Aquifer: Model Simulations

Content Provider	Springer Nature Link
Author	Schuh, W. M. Klinkebiel, D. L.
Copyright Year	2003
Abstract	Simulated recharge to a shallow confined aquifer indicates that locally concentrated recharge through microtopographically determined recharge areas (having elevation differences of less than 2 cm) can have a substantial effect on the spatial variability of nitrate-N concentrations [N-NO$_{3}$] in the upper meter of an aquifer. For an aquifer that is confined and near pressure equilibrium with the watertable, hydraulic mounds formed under recharge areas can cause temporary large local increases in hydraulic gradient and subsequent flux from the aquitard to the upper aquifer. These hydraulic “surges” carry nitrates from the aquitard to the upper aquifer, where they move as local plumes and disperse according to the properties of the prevailing aquifer flow system, until discharged, reduced to ammonia, or denitrified. Under conditions of maximum local recharge the ratio of aquifer nitrate concentration to till nitrate concentration ([N-NO$_{3}$]$_{a}$/[N-NO$_{3}$]$_{t}$) may approach an upper limit of 1. Understanding these processes is important for interpretation of nitrate and other solute measurements near the aquifer-aquitard boundary.
Starting Page	257
Ending Page	272
Page Count	16
File Format	PDF
ISSN	15207439
Journal	Natural Resources Research
Volume Number	12
Issue Number	4
e-ISSN	15738981
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2003-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Economic Geology Hydrogeology Math. Applications in Geosciences Sedimentology
Content Type	Text
Resource Type	Article
Subject	Environmental Science

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