Techniques and Methods 6–A34
This report documents modifications to the Streamflow-Routing Package (SFR2) to route streamflow through grids constructed using the multiple-refined-areas capability of shared node Local Grid Refinement (LGR) of MODFLOW-2005. MODFLOW-2005 is the U.S. Geological Survey modular, three-dimensional, finite-difference groundwater-flow model. LGR provides the capability to simulate groundwater flow by using one or more block-shaped, higher resolution local grids (child model) within a coarser grid (parent model). LGR accomplishes this by iteratively coupling separate MODFLOW-2005 models such that heads and fluxes are balanced across the shared interfacing boundaries. Compatibility with SFR2 allows for streamflow routing across grids. LGR can be used in two- and three-dimensional, steady-state and transient simulations and for simulations of confined and unconfined groundwater systems.
First posted June 21, 2011
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Mehl, S.W., and Hill, M.C., 2011, MODFLOW–LGR—Modifications to the streamflow-routing package (SFR2) to route streamflow through locally refined grids: U.S. Geological Survey Techniques and Methods 6–A34, 14 p.
Approach for Modifying SFR for Compatibility with LGR
Modified Input Instructions for SFR2 Package
Appendix 1. Changes to gwf2sfr7.f