[GRASSLIST:1173] Papers on hydrogeological applications in GRASS GIS?

GRASS GRASS user
1

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Hi.

I've finaly constructed my DEM under GRASS and now I'm looking for an
application theme to hydrogeological problems using GRASS for my degree
thesis.
Besides the DEM I also have rainfall and temperature data of 5 climatic
stations over a 150 km2 area. I also have the 12 month discharge data of
50 springs besides tmeperature, pH, & conductivity data.
I've being reading some documentation but haven't found much on
hydrological problems concerning the application of Grass Gis
tecnologies in solving hydrogeological problems.
For example. I was thinking of resolving the water balance equation with
grass. Well,.... at least I wanted to try to see what are the technical
problems envolved in such a matter.
I understand that every term of the water balance equation is a problem
on it's own and even this could be a solution to study for my thesis.
I could:
a) try to compute evaporation;
b) compute runoff water &/or infiltration;
c) ground water discharge but this is a difficult problem to solve in a
mountainous region like mine. I would have to compute it indirectly from
the P, E & R parameters.

Does anyone have any other suggestions? And most of all does anyone have
some links to online documentation? I ran through the bibliografic
database of online grass pubblications but didn't find much specific.

Greetings
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[Wednesday 10 September 2003 11:19] From Antonio G. - Geotronix

There are already some models implemented in GRASS: have a look to r.answers,
or r.topmodel for example.
Here, at the swlab, we also developped a water balance model, SMDR (for Soil
Moisture Distribution and Routing), implemented as a set of bash/gawk/GRASS
scripts (I'm slowly converting some to Perl). Working with scripts is nice to
reduce the development time, but has a detrimental effect on computation
time, as you can imagine. It's OK for small watersheds (the larger I'm ready
to deal with is 800x900 cells, usually with a 10m gridsize), as long as some
hypotheses can be accptd.
We're still in development stage, the documentation is scarce, and the program
is far from being user-friendly, hence the limited availability. We'd be
happy to help you or any other potential user, though. Just leave an email
for further details (where to get some bibliographical references and a draft
of the documentation, as a starter).
Thanks
P.

--
Soil & Water Laboratory
Dept. of Biological & Environmental Engineering
Cornell University
ITHACA, NY 14853
Tel: (607)255.2463