Groundwater flow modelling

These modules were developed to use GRASS mainly as a preprocessor for the development of groundwater flow models. However, the r.gmtg module also works as a postprocessor for MODFLOW

r.gmtg

The groundwater modelling tool for GRASS (r.gmtg) is a module for the GRASS GIS that links this GIS with the finite difference groundwater flow model MODFLOW. The current version works with GRASS 5.4 and MODFLOW 96 (a recent version, not the one from 1996) but current work is being done to develop a new version for GRASS 6.0 and MODFLOW 2000.

The new version (r.gmtgs) will read data from PostgreSQL (e.g. information for wells) to develop groundwater flow models. This is quite handy to determine from which model layer a well is extracting water from. The r.gmtg module can be used for both steady state and transient simulation of multilayer models.

Available here.

v.trimesh

This module generates a triangular mesh through the use of Jonathan Shewchuk's Triangle library. The module reads areal constraints (maximum areas for triangles in a given area) from the vector attribute table and writes the triangular mesh with two tables on two layers: layer one corresponds to nodal properties, while layer two corresponds to areal attributes. These tables can be used to sample raster surfaces for nodal/areal properties.

Available here.