Thanks Soren, >From you response, can you please tell me how to do the following two tasks (which i dont find in the online manual for r.gwflow): the remainder of your comments i have figured out.
- How can i compute the flux in [m^3/s] for each cell with r.mapcalc? and - i have set the bc of the edges and stream cells at constant head for now- how can i get the budget raster maps you mention? thanks again, Vishal On Sat, Jul 14, 2012 at 12:05 PM, Sören Gebbert < [email protected]> wrote: > Hi, > sorry for the delay. > > 2012/7/11 Vishal Mehta <[email protected]>: > > 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? > > Constant flux can currently only be defined using sources/sinks with > unit [m^3/s], that is option q. > But i can add two new options (fn, fe) that defines the flux in > northern or eastern direction using the unit [m/s] > that will be multiplied internally with the northern or eastern face > area of the cell? > > Otherwise you need to compute the flux in [m^3/s] for each cell with > r.mapcalc. > > > > > 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 > > You can use the river boundary condition to specify the flux in stream > pixel. > > > 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? > > You can set the boundary of interest to constant head pixel and > compute the flow throw the boundary pixel using the budget option. > The resulting budget raster map shows the flow from active cell into > sources, sinks and constant heads in [m^3/s]. > > Best regards > Soeren > -- 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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