Pumping Regime Influence On Groundwater
Quality In The Proximity Of A Polluted Lake
Author(s)
A. M. Marinov & I. Marinov
Abstract
Our work analyzes the impact of the pumping regime in a series of wells on
groundwater quality in an aquifer bounded by a polluted lake. The natural river
Olt was modified for energetic purposes and turned into a lake in the proximity
of the Romanian town of Slatina. Drinking water for Slatina is obtained by a
pumping system of 160 wells disposed in lines along the lake margins. A total
discharge of 460 l/s is pumped from two groundwater layers: a confined one and
an unconfined (phreatic) layer, separated by an aquitard. We integrate the
equations describing the three dimensional water flow and pollutant dispersion in
the phreatic aquifer using the Visual MODFLOW-PRO program. We use
boundary conditions from measured levels in the wells and local
geomorphological data to calibrate the model. Model results agree well with
observed equipotential lines for the phreatic aquifer. A big chemical plant
situated upstream pollutes the lake and in turn the local groundwater. The chosen
level of pumping in the wells is shown to strongly influence the flow direction in
the phreatic and the resulting level of pollution in the pumped water. We show
that decreasing the well pumping rates increases the water travel time such that
the pollutant concentration in drinking water can be decreased under admissible
limits. We calculate how pollutant concentration in the drinking wells depends
on the value chosen for the dispersivity coefficient.
Keywords: groundwater pollution, pumping system, pumping rate, phreatic
aquifer, pollutant concentration.
Keywords
groundwater pollution, pumping system, pumping rate, phreatic
aquifer, pollutant concentration
Related Book
Other papers in this volume
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