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
Hi,
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.
Anna
On Thu, Jan 23, 2020 at 5:16 AM Johannes Radinger <johannesradinger@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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