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Online Guide to MODFLOW

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LGR Control File

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Purpose

To identify the input files of the parent and child models and to indicate how they relate to one another

Documentation

Mehl, S.W. and Hill, M.C., 2005, MODFLOW-2005, the U.S. Geological Survey modular ground-water model -- documentation of shared node local grid refinement (LGR) and the Boundary Flow and Head (BFH) Package: U.S. Geological Survey Techniques and Methods 6-A12, 68 p.

Mehl, S.W. and Hill, M.C., 2007, MODFLOW-2005, the U.S. Geological Survey modular ground-water model -- documentation of the multiple-refined-areas capability of local grid refinement (LGR) and the Boundary Flow and Head (BFH) Package: U.S. Geological Survey Techniques and Methods 6-A21. 13 p.

Mehl, S.W., and Hill, M.C., 2013, MODFLOW–LGR --Documentation of ghost node local grid refinement (LGR2) for multiple areas and the boundary flow and head (BFH2) package: U.S. Geological Survey Techniques and Methods book 6, chap. A44, 43 p.

Related Packages

BFH Package

SFR Package

Supported in

MODFLOW-LGR

MODFLOW-OWHM

Other Notes

The BFH Package and LGR cannot be used simultaneously. Thus, when using LGR, the Name file specified in the LGR control file cannot use file type BFH.

LGR Input Instructions

When executed, MODFLOW-LGR prompts for the name of a file. If a Name File (Harbaugh and others, 2000, p. 7, 43) is entered, LGR is not used. To use LGR, the name of the LGR Control File is entered. The contents of this file are described here.

The LGR Control File is distinguished from a Name file by the presence of a keyword “LGR” as the first non-commented input. LGR reads its input data from this file. Input for LGR is defined using 15 items. Each item is read free format.

FOR EACH SIMULATION

Data Set 0

[#Text]

Item 0 is optional - # must appear in column 1. Item 0 can be repeated multiple times.

Data Set 1

Data Set 2

FOR THE PARENT GRID (the parent grid needs to be listed before the child grid)

Data Set 3

Data Set 4

Data Set 5

IUPBHSV IUPBFSV

FOR EACH CHILD GRID [repeat items 6 through 15 for each grid with the exception of the parent grid. That is, repeat these items a total of (NGRIDS - 1) times]

Data Set 6

Data Set 7

Data Set 8

ISHFLG IBFLG IUCBHSV IUCBFSV

Data Set 9

MXLGRITER IOUTLGR

Data Set 10

RELAXH RELAXF

Data Set 11

HCLOSELGR FCLOSELGR

Data Set 12

NPLBEG NPRBEG NPCBEG

Data Set 13

NPLEND NPREND NPCEND

Data Set 14

Data Set 15

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