On Wed, Jul 11, 2012 at 1:49 PM, Vishal Mehta <[email protected]> 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 <[email protected]> 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 >> <[email protected]> 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 <[email protected]>: >> >> 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 >> >> >> >> _______________________________________________ >> >> grass-user mailing list >> >> [email protected] >> >> http://lists.osgeo.org/mailman/listinfo/grass-user >> >> >> > _______________________________________________ >> > grass-user mailing list >> > [email protected] >> > http://lists.osgeo.org/mailman/listinfo/grass-user >> > > > > -- > 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
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
