[GRASS-user] help with r.gwflow

[Vishal Mehta]

On Wed, Jul 11, 2012 at 1:49 PM, Vishal Mehta <vishalm1975 at gmail.com> wrote:

> Thanks Soren,
> That explains some of the results i'm getting, with water piling up above
> the surface in the edges in low-lying areas.
>
> Can you please tell me how i can change that to constant flux or constant
> head? If constant flux, should that be in m/s units?
>
> My problem though is that i dont know what a constant flux or head at the
> edges should be set to. For now the only bc i have put in there
> deliberately (beyond the default you mention) is that i have set constant
> head in stream pixels. I'll have to let flow through at the edges but i
> have no idea what that flow should be. Are there some ways of setting the
> edge conditions such that the gw evolution in the central areas of interest
> are not highly influenced?
>
> And Markus at the very least the manual should make it explicit that the
> default is a no-flux boundary.
> Thanks,
> Vishal
>
>
> On Wed, Jul 11, 2012 at 1:15 PM, Markus Neteler <neteler at osgeo.org> wrote:
>
>> Hi Vishal, Sören,
>>
>> please send me a text snippet for inclusion into the manual in case
>> you want it to be improved.
>>
>> thanks
>> Markus
>>
>> On Wed, Jul 11, 2012 at 9:33 PM, Sören Gebbert
>> <soerengebbert at googlemail.com> wrote:
>> > Hi,
>> > as default the boundaries are no flow boundary conditions called
>> > "homogeneous Neumann". Hence the default flux is 0.
>> >
>> > Best regards
>> > Soeren
>> >
>> > 2012/7/11 Vishal Mehta <vishalm1975 at gmail.com>:
>> >> Hi all,
>> >>
>> >> I've been trying to use r.gwflow recently, for groundwater modeling in
>> urban
>> >> environments.
>> >>
>> >> The r.gwflow help says that the default boundary conditions at the
>> edges of
>> >> the region are Neumann conditions, which i understand are fixed flux
>> >> conditions. However the help does not include the value of the default
>> flux
>> >> conditions at the boundary. Can someone help me figure out what that
>> is?
>> >>
>> >> Also, if there is anyone actively using r.gwflow who is interested in
>> >> engaging a bit more, please let me know.
>> >> Thanks,
>> >> Vishal
>> >>
>> >> --
>> >> Vishal K. Mehta, PhD
>> >> Scientist
>> >> Stockholm Environment Institute - US
>> >> 133 D St Suite F
>> >> Davis CA 95616
>> >> www.sei-us.org
>> >>
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>
>
>
> --
> Vishal K. Mehta, PhD
> Scientist
> Stockholm Environment Institute - US
> 133 D St Suite F
> Davis CA 95616
> www.sei-us.org
>



-- 
Vishal K. Mehta, PhD
Scientist
Stockholm Environment Institute - US
133 D St Suite F
Davis CA 95616
www.sei-us.org
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