SIMULATION AND DESIGN OF PUMPING AND INJECTION SCHEMES FOR AQUIFER RESTORATION UNDER VARIABLE HYDROGEOLOGIC CONDITIONS
SATKIN, RICHARD L.
Master of Science
The USGS MOC Model is a useful tool for evaluating different well patterns in an aquifer restoration scheme under variable hydrogeologic conditions. The best well pattern for a groundwater cleanup is highly site-specific and depends upon the objectives and constraints for each problem. In this research, seven different well patterns were studied to determine which well pattern(s) is the most efficient in achieving a range of desired levels of contaminant reduction. The well patterns were evaluated on the basis of cleanup time, volume of water circulated and volume of water requiring treatment. Eight generic hydrogeologic conditions were modeled using different combinations of drawdown, hydraulic gradient and dispersivity. The key hydrogeologic variables which control the rate of cleanup are well locations, pumping rates, transmissivity, dispersivity and hydraulic gradient. For a given set of well locations, by varying transmissivity and maintaining drawdown, dispersivity and hydraulic gradient constant, the cleanup time was found to be inversely related to the pumping rate.