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Track: Water Resources
Sharon Qi
U.S. Geological Survey
PO Box 25046
MS 415
Denver, CO 80225
Telephone: 303-236-4882
Fax: 303-236-4912
E-mail: slqi@usgs.gov
Jennifer Sieverling
Using ArcInfo To Facilitate Numerical Modeling of Groundwater Flow
ArcInfo* was used to efficiently create required input data sets and assist in interpretation of groundwater flow near a known hazardous material plume. Input data for the groundwater flow model MODFLOW were prepared using ArcInfo. Point, line, and polygon coverage representations of the model mesh were created using MODELGRID.AML. The ARC GRID module was used to calculate saturated thickness, and other data sets were generated as input to the model including boundary features, hydraulic conductivity, impervious area, and location of a subsurface groundwater remediation structure. The programs REALGRIDARRAY.AML and ZONEARRAY.AML were used to overlay the model mesh with the data sets to produce formatted input for the model. Data display and review in ArcInfo assisted in the interpretation of groundwater flow. Changing parameters, such as boundary conditions and configuration of the remediation structure, was facilitated by ArcInfo; not only was editing input data as coverages easier, but the
representation of the input data as spatially referenced data ensured a more realistic representation of the study area because of the capability to display and overlay related spatial data. * The use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. government.
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