Two-Dimensional Groundwater Transport Subgrids in a 3-D Flow Modelby Gerard P. Lennon, Lehigh Univ, Bethlehem, PA, USA,
Douglas Rumbaugh, Lehigh Univ, Bethlehem, PA, USA,
Abstract: The USGS Modular 3-D Finite Difference Ground-Water Flow Model by McDonald and Harbaugh (MODULAR) simulates ground-water flow in three dimensions by breaking the modeled region into several layers of 'blocks' with a node located in the center of each block. Konikow and Bredehoeft's Method of Characteristics Solute Transport Model (MOC) is a 2-D flow and solute transport model that tracks the movement of individual solute particles. The 1986 version provides a transport subgrid or 'window' inside the 2-D MOC model. The 3-D MODULAR output fluxes, water levels, stratigraphy, and other data are used as input into the MOC flow model 'extracted window' or subgrid which is used to recalculate the flow problem. A case study is used to demonstrate the application of the technique to a relatively large and complex problem.
Subject Headings: Hydrologic models | Three-dimensional models | Three-dimensional flow | Two-dimensional models | Groundwater flow | Sediment transport | Two-dimensional flow | Grid systems
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