Hi Moritz,
We had no real data for the lake bathymetry so we built it by
artificially lowering the DEM values with a constant value. This is also
the reason why the water depth is constant.
Regards,
Codrina
On 29/08/2017 00:29, Moritz Lennert wrote:
Le Mon, 28 Aug 2017 17:05:01 -0400,
Anna Petrášová <[email protected]> a écrit :
Hi,
On Mon, Aug 28, 2017 at 4:53 PM, Codrina Maria Ilie
<[email protected]> wrote:
Hi all,
I have been trying to run GRASS7 module r.damflood using the
following datasets
[https://drive.google.com/drive/folders/0B2Yx_1shUSx3VThlY3BrV1JyWjg?usp=sharing],
with this command:
r.damflood --overwrite --verbose elev=dem lake=water_depth
dambreak=dam_breach manning=manning tstop=3 deltat=1 h=b_depth
vel=b_vel hmax=b_mwd vmax=b_mwv imax=b_mi wavefront=b_wf
To make it easier, the lake has a constant depth.
As far as I can understand, the rasters should be correctly built,
but the outputs of r.damflood are obviously wrong (rasters with
nodata or one category = 0; at second 1 the depth raster is half
the lake's size (s00.png, s01.png)and at second 2, it completely
disappears).
During the processing, I get the Courant-Friedrich-Lewy stability
condition warning message.
If I try to chose as computational method for initial velocity
estimation, uniform drop in of lake or small dam breach, I get the
following error "ERROR: Don't find the dambreak - Please select a
correct map or adjust the computational region".
Does anyone have an idea what could be the reason of these results,
please? Any suggestion would be highly appreciated.
Your water_depth should have 0 instead of nulls, I think that's the
problem in your case. The stability condition warning probably means
you should reduce your time step, on the other hand, it will take more
time.
r.null null=0 gets rid of the stability condition warning as well.
However, I don't know much about this module, but I'm a bit surprised
by your DEM: IIUC, it's level is lower in the entire dam lake area than
in the valley below. Also: is it normal that your water depth is
constant all over the lake ?
Moritz
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