[GRASS-user] r.sim.water simulation considering dams

Anna Petrášová kratochanna at gmail.com
Wed Jan 29 05:47:02 PST 2020


I don't have any experience with that parameter, but I think if you don't
need permeable structures, you don't need that parameter. I would try to
represent the structures in the elevation, that should work. But keep in
mind that it's a shallow water flow model, so it's not ideal for filling
large and deep depressions. In that case you can also consider Itzi model.


On Thu, Jan 23, 2020 at 5:16 AM Johannes Radinger <
johannesradinger at gmail.com> wrote:

> Dear GRASS users,
> maybe someone of you has already worked with r.sim.water while considering
> dams as impermeable structures that retain water, i.e. create
> impoundments/reservoirs.
> I am wondering how to best specify dams within r.sim.water: There is the
> parameter flow_control which is a raster map that indicates the
> permeability of the landscape. The manual mentions here a permeability
> ratio (0-1) and I guess this should be 0 for all cells that represent a dam
> and 1 for all other cells of the computational region?!
> But what about the elevation data then; Do I need to provide an
> elevation raster that includes the dam height or should this be the
> elevation as without dams?
> I'd like to know whether I need to provide a flow_control map or an
> elevation map that includes dams or both? I couldn't find any example of
> r.sim.water that uses the flow_control parameter so far... any
> ideas/experiences from your side?
> cheers,
> Johannes
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