[GRASS-user] r.damflood question

[Codrina Maria Ilie]

Hi Anna,

You were perfectly right!
I changed from null to 0 and it works.

Thank you!
Codrina

On 29/08/2017 00:05, Anna Petrášová wrote:
> Hi,
> 
> On Mon, Aug 28, 2017 at 4:53 PM, Codrina Maria Ilie
> <codrina at geo-spatial.org> 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.
> 
> Anna
> 
>>
>> Cheers,
>> Codrina
>>
>>
>>
>>
>>
>>
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