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Next message Nico Batz (Nico) posted on Monday, January 11, 2010 - 05:38 pm
Hello Tom,

First, thanks for the help for the spin-up run but till now, I couldn´t do a complete run. I´m struggling with reducing computational time of the model, so that it gets done within a certain feasible time frame.

At the moment it takes at a DEM resolution of 15m, 60.452 cells, and a Q=50 (mean Q), 2 ˝ real hours to simulate 1 day.

I tried now to change variables which influence the speed as the erosion limit, resolution+study area size= number of cells, and the “min Q for depth calc”.
I have been able to reduce the same data set mentioned above to, real ˝ hour to simulate 1 day.

Are there any other options I can check to reduce computational time?

I would like to model at a 5m resolution and even on a bigger area.
I thought to use as a rule of thumb to simulate 2 days at the “real” minute, otherwise I will never be able to simulate 20 yr.
Do you think it is feasible?

Do you have any suggestion?

Thanks
Nico
Next message Nico Batz (Nico) posted on Tuesday, January 12, 2010 - 05:41 pm
hello again,

sorry if i´m already posting an other question.

i tried today to see if the "flow distribution" parameter has an influence on the speed. and i found that it has.
the strange thing, is that the speed doubles from "flow distribution"=2 to the "flow distribution"=3. after the speed increases almost nothing.
also the output differs strongly between 2 and >2 but not between the four >2 outputs that i calculated.

if i understand right, through this parameter I set how many cells around the calculated one, will get water from the previous. right?
so my question:
is there a different formula if using the value 2 or >2 as flow distribution parameter?
or did i understand something wrong with this parameter?

thanks
Nico
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