The estimation of recharge in complex glacial topography is difficult to determine. This study utilizes an inverse numerical groundwater model and applies a landform-based approach to estimate this parameter in the stagnation complex of the Itasca moraine in north-western Minnesota. The landform assemblages were defined based on their glacio genie origin as well as topography, sedimentology, and stratigraphy. The Itasca moraine was chosen based on the numerous sedimentological and topographically distinct landform assemblages present. Eight separate landform assemblages were delineated and used as fundamental hydrostratigraphic units, each assigned specific parameters based their individual characteristics. The numerical flow simulation was set up in MODELCAD and run under steady state conditions with MODFLOW. The model was calibrated by varying the spatial distribution of recharge over each landform assemblage. A recharge value and range of recharge was determined for each landform assemblage.
A Thesis submitted to the faculty of the Graduate School of the University of Minnesota by Lynette Marie St. George in partial fulfillment of the requirements for the degree of Master of Science, June 1994. Plate 1 referenced in the thesis is also attached to this record.
St George, Lynette Marie.
A Landform-Based Approach to the Estimation of Groundwater Recharge in Complex Glacial Topography.
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