[GRASS-user] Modelling for groundwater

GRASS GRASS user
1

Hi All,
Modelling for groundwater

Pl suggest any work done through GRASS or any other FOSS GIS on the above topic.
ThanX in anticipation
Ravi Kumar

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2

RAVI KUMAR wrote on 02/06/2007 06:34 AM:

Hi All,
Modelling for groundwater
Pl suggest any work done through GRASS or any other FOSS GIS on the above topic.
ThanX in anticipation
Ravi Kumar

In GRASS 6.3.cvs, recently r.gwflow and r3.gwflow were introduced:
http://grass.itc.it/grass63/manuals/html63_user/r.gwflow.html
http://grass.itc.it/grass63/manuals/html63_user/r3.gwflow.html

Markus

3

Hi Ravi and Markus,

RAVI KUMAR wrote on 02/06/2007 06:34 AM:
> Hi All,
> Modelling for groundwater
>
> Pl suggest any work done through GRASS or any other FOSS GIS on the
> above topic.
> ThanX in anticipation
> Ravi Kumar

In GRASS 6.3.cvs, recently r.gwflow and r3.gwflow were introduced:
http://grass.itc.it/grass63/manuals/html63_user/r.gwflow.html
http://grass.itc.it/grass63/manuals/html63_user/r3.gwflow.html

Markus

Thanks Markus,
right now these two modules are not documented and in a very early functional state, like the underlying gpde lib.
But i will submit in the next weeks (2-4) a major update of the gpde lib and the groundwater flow modules.
This will include a much better documentation,
exact null value support for 2d and 3d data arrays, array io functions, gradient calculation, more unit tests and
a new solute transport module for transport calculation of groundwater pollution in porous media 2d/3d.

AFAIK, there was a module to combine modflow with grass
for groundwater calculation:
http://www.valledemexico.ambitiouslemon.com/gwmodelling.html
but this link is not reachable. :frowning:

Best regards
Soeren

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4

Sören,

So what model is actually used? Not MODFLOW, judging from your comments. I am eager to see more documentation!

Regards,
Tom

Sören Gebbert wrote:

Hi Ravi and Markus,

RAVI KUMAR wrote on 02/06/2007 06:34 AM:
    

Hi All,
Modelling for groundwater
Pl suggest any work done through GRASS or any other FOSS GIS on the above topic.
ThanX in anticipation
Ravi Kumar
      

In GRASS 6.3.cvs, recently r.gwflow and r3.gwflow were introduced:
http://grass.itc.it/grass63/manuals/html63_user/r.gwflow.html
http://grass.itc.it/grass63/manuals/html63_user/r3.gwflow.html

Markus
    
Thanks Markus,
right now these two modules are not documented and in a very early functional state, like the underlying gpde lib. But i will submit in the next weeks (2-4) a major update of the gpde lib and the groundwater flow modules. This will include a much better documentation, exact null value support for 2d and 3d data arrays, array io functions, gradient calculation, more unit tests and a new solute transport module for transport calculation of groundwater pollution in porous media 2d/3d.

AFAIK, there was a module to combine modflow with grass
for groundwater calculation:
http://www.valledemexico.ambitiouslemon.com/gwmodelling.html
but this link is not reachable. :frowning:

Best regards
Soeren

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser
    
--
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177

EMAIL: thomas.adams@noaa.gov

VOICE: 937-383-0528
FAX: 937-383-0033

5

Hi all,

I don’t know what’s wrong with the server on which my webpage is hosted. It was working yesterday, so hopefully it won’t be long for it to be accessible again.
The r.gmtg module works with grass 5.4 and modflow 96 (the latest modflow 96 version of 2000). I’ve thought of upgrading the module for a while and started to work on it, but some more urgent projects took a higher priority. The version on which I’m currently working will use grass 62 and modflow 2005, which was just released.
The webpage pointed by Sören (www.valledemexico.ambitiouslemon.com/gwmodeling.html) has the r.gmtg module and a brief tutorial. A more detailed description is available on Computers and Geosciences 32(3): 339-351

In case the webpage’s still out longer I’ll figure out a way to upload both the module and MODFLOW-96 (the version on my webpage was slightly modified).

Cheers,

Jaime

Thomas Adams Thomas.Adams@noaa.gov escribió:

Sören,

So what model is actually used? Not MODFLOW, judging from your comments.
I am eager to see more documentation!

Regards,
Tom

Sören Gebbert wrote:

Hi Ravi and Markus,

RAVI KUMAR wrote on 02/06/2007 06:34 AM:

Hi All,
Modelling for groundwater

Pl suggest any work done through GRASS or any other FOSS GIS on the
above topic.
ThanX in anticipation
Ravi Kumar

In GRASS 6.3.cvs, recently r.gwflow and r3.gwflow were introduced:
http://grass.itc.it/grass63/manuals/html63_user/r.gwflow.html
http://grass.itc.it/grass63/manuals/html63_user/r3.gwflow.html

Markus

Thanks Markus,
right now these two modules are not documented and in a very early functional state, like the underlying gpde lib.
But i will submit in the next weeks (2-4) a major update of the gpde lib and the groundwater flow modules.
This will include a much better documentation,
exact null value support for 2d and 3d data arrays, array io functions, gradient calculation, more unit tests and
a new solute transport module for transport calculation of groundwater pollution in porous media 2d/3d.

AFAIK, there was a module to combine modflow with grass
for groundwater calculation:
http://www.valledemexico.ambitiouslemon.com/gwmodelling.html
but this link is not reachable. :frowning:

Best regards
Soeren

grassuser mailing list
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http://grass.itc.it/mailman/listinfo/grassuser

–
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177

EMAIL: thomas.adams@noaa.gov

VOICE: 937-383-0528
FAX: 937-383-0033

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6

Hi Thomas,
i have implemented a new library (gpde) to solve
partial differential equations within grass.
Based on this library
the groundwater flow equation( based on the law of Darcy) is
discretized with the finite volume method and solved with
solvers implemented in the gpde library.

Two pde's are used, one for 2d confined and unconfined, transient
groundwater flow and one for 3d confined transient groundwater flow.

Like these ones:
http://en.wikipedia.org/wiki/Groundwater_flow_equation

The following solvers are implemented:
* method of conjugate gradients (cg) for symmetric, positive definite sparse and quadratic matrices
* method of biconjugate gradient (bicgstab) for unsymmetrical, none definite sparse and quadratic matrices
* GAUSS elimination for quadratic matrices
* LU decomposition for quadratic matrices

All solvers and the linear equation assembling functions are parallelized
with OpenMP (www.openmp.org).

So i do not use any available groundwater flow models, i have implemented
a new one. Well, i'm quite sure that the new model is no comparison
to the existing ones (MODFLOW; FEFLOW, ...).
The current groundwater flow modules are only useful for simple problems,
only dirichlet and neumann boundary conditions are implemented.

But i hope to encourage other people to solve
pde's within grass with the gpde lib, based on raster, volume and vector data.

And a nice feature of the gpde library is the parallel computation on multicore machines. Take a look at this speedup of the cg method:
http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/sgi_altix_cg_bench.png

Best regards
Soeren

-------- Original-Nachricht --------
Datum: Tue, 06 Feb 2007 12:02:53 -0500
Von: Thomas Adams <Thomas.Adams@noaa.gov>
An: "Sören Gebbert" <soerengebbert@gmx.de>
CC: Markus Neteler <neteler@itc.it>, grassuser@grass.itc.it
Betreff: Re: [GRASS-user] Modelling for groundwater

Sören,

So what model is actually used? Not MODFLOW, judging from your comments.
I am eager to see more documentation!

Regards,
Tom

Sören Gebbert wrote:
> Hi Ravi and Markus,
>
>
>> RAVI KUMAR wrote on 02/06/2007 06:34 AM:
>>
>>> Hi All,
>>> Modelling for groundwater
>>>
>>> Pl suggest any work done through GRASS or any other FOSS GIS on the
>>> above topic.
>>> ThanX in anticipation
>>> Ravi Kumar
>>>
>> In GRASS 6.3.cvs, recently r.gwflow and r3.gwflow were introduced:
>> http://grass.itc.it/grass63/manuals/html63_user/r.gwflow.html
>> http://grass.itc.it/grass63/manuals/html63_user/r3.gwflow.html
>>
>> Markus
>>
>
> Thanks Markus,
> right now these two modules are not documented and in a very early
functional state, like the underlying gpde lib.
> But i will submit in the next weeks (2-4) a major update of the gpde lib
and the groundwater flow modules.
> This will include a much better documentation,
> exact null value support for 2d and 3d data arrays, array io functions,
gradient calculation, more unit tests and
> a new solute transport module for transport calculation of groundwater
pollution in porous media 2d/3d.
>
> AFAIK, there was a module to combine modflow with grass
> for groundwater calculation:
> http://www.valledemexico.ambitiouslemon.com/gwmodelling.html
> but this link is not reachable. :frowning:
>
> Best regards
> Soeren
>
>
>
>> _______________________________________________
>> grassuser mailing list
>> grassuser@grass.itc.it
>> http://grass.itc.it/mailman/listinfo/grassuser
>>
>
>

--
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177

EMAIL: thomas.adams@noaa.gov

VOICE: 937-383-0528
FAX: 937-383-0033

--
Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer