Accession Number:

ADA588758

Title:

Program Developments For Modeling Groundwater Flow In Three-Dimensional Heterogeneous Aquifers With MODFLOW And MODFLOWP

Descriptive Note:

Technical rept.

Corporate Author:

BOISE STATE UNIV ID CENTER FOR THE GEOPHYSICAL INVESTIGATION OF THE SHALLOW SUBSURFACE

Report Date:

1998-11-01

Pagination or Media Count:

37.0

Abstract:

This report documents 1 a number of stand-alone utilities to assist with input to MODFLOW and 2 code modifications internal to MODFLOW and MODFLOWP. These were developed to improve ease of use of MODFLOW and MODFLOWP for modeling groundwater flow in three-dimensional heterogeneous systems. Several utilities to assist with input to MODFLOW are specifically designed for use with the Goundwater Modeling System GMS pre-and post-processor package. New features for MOD FLOW include routines for 1 assignment of material blocks and material types to these blocks within a given three-dimensional grid mesh 2 generation of the Block Centered Flow BCF file for heterogeneous aquifers with material properties assigned to blocks, and with internal calculation of leakance and thickness-factored parameters T, S 3 distribution of pumping rate for individual model layers for a well that draws from or injects into multiple layers 4 calculation of weighted draw down for an observation well screened over multiple layers and 5 customizing the drawdown output file to contain data for a specified number of observation wells, rather than every node in the domain. For MODFLOWP, the program has been modified to 1 simplify input by making the .PAR file free format 2 allow the user to easily change the number and combination of parameters for estimation in a given run by modifying one line rather than regenerating the .PAR file 3 automatically calculate ROFFs, COFFs,. and TOFFs for observation wells 4 notify the user during program execution when lower or upper parameter ranges are exceeded and 5 provide monitoring of run time.

Subject Categories:

  • Physical Chemistry
  • Geology, Geochemistry and Mineralogy
  • Hydrology, Limnology and Potamology
  • Computer Programming and Software
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE