[GRASS-user] Repeated r.watershed runs

[Laurent C.]

Hello Marco,

Itzï (www.itzi.org) is built upon GRASS and employs a partial inertia
simplification of the Saint-Venant equations.
It is certainly not as hydraulically accurate as the finite-volume
approach of ANUGA, but it gives quite good results as a flood model,
and is likely to be much faster.

Regards,
Laurent


2017-09-04 2:41 GMT-05:00 Marco Alicera <marco.alicera at gmail.com>:
> Reading the subject and agreeing with Thomas about the limitations of
> r.watershed, I wonder if there is any effort to port any of the models based
> on the shallow water wave equations to grass. I recently read about the
> anuga project https://anuga.anu.edu.au/wiki and it would be nice to use it
> with a more friendly GIS environment.
> Regards
> --
> Marco
>
> 2017-09-01 11:04 GMT+02:00 Moritz Lennert <mlennert at club.worldonline.be>:
>>
>> On 01/09/17 09:50, Ken Mankoff wrote:
>>>
>>> Dear Moritz,
>>>
>>> Yes, the three day estimate is from the first hour of this command:
>>>
>>> seq 14000 | parallel --bar r.watershed elevation=DEM.fixed
>>> flow=runoff.{#} accumulation=acc.{#}
>>
>>
>> Have you checked memory usage. Setting memory= to something higher than
>> the default value of 300MB could possibly speed things up a bit.
>>
>>>
>>> I have a 4-core laptop.
>>
>>
>> Time to find more cores... ;-)
>>
>>
>> Moritz
>>
>>
>>
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