The Groundwater Modeling Tool for GRASS; a tutorial

The Groundwater Modeling Tool for GRASS;
a tutorial
Jaime J. Carrera Hernandez
January 2005 DRAFT version
McGill University
Department of Civil Engineering and Applied Mechanics
jaime.carrera@mail.mcgill.ca
Abstract
This tutorial shows how to develop groundwater flow models using GRASS
and MODFLOW. This is done through the “Groundwater Modeling Tool for
GRASS” (GMTG) or r.gmtg module which works under GRASS. This mod
ule can be used to run stady state and transient simulations on multilayer
aquifers. The current MODFLOW packages supported by r.gmtg are those
used to simulate wells (extraction and injection), rivers, recharge and drains.
1 Introduction
This is a brief tutorial on how to develop groundwater flow models using GRASS’
module r.gmtg. The user should be familiar with different modules of GRASS
such as r.reclass, r.mapcalc. For further reference on GRASS you can read the on
line tutorials or the GRASS book by Neteler and Mitasova (2004). The problems
developed in this tutorial are taken from Chiang (2001), who developed the Pro
cessing MODFLOW for Windows (PMWIN) software. These examples are used
to compare the results obtained using a well known MODFLOW processor with
those obtained using GMTG. This module is an improved version of the one de
scribed by Carrera Hernandez´ and Gaskin (2004) and current work is being done
to use other MODFLOW packages.
11.1 Description of tutorial
The examples developed in this tutorial will help you to gain a general knowl ...