[GRASSLIST:487] Re: running r.topmodel

[Thomas Adams]

Jaime,

I believe I can help you, although:

(1) I have never run TOPMODEL in GRASS (just the Fortran standalone version)

(2) the link to Lancaster Univ. is old, in fact I'm not sure Kieth Bevan 
& Lancaster Univ. even make the original source available now, from what 
I can see at: http://www.es.lancs.ac.uk/hfdg/freeware/hfdg_freeware_top.htm

My guesses are these, since they conform to the GRASS r.topmodel manual 
page and the original files for the standalone version of TOPMODEL:

parameters=string
(i) TOPMODEL Parameters file, where the standalone file looked like this:

SUBCATCHMENT 1
0.032 5.0 50. 3600.0 3600.0 0.05 0.0000328 0.002 0 1.0 0.02 0.1

I can not remember what's what; I'll have to dig this up, plus I'll have 
to look at the r.topmodel source code more — I believe the data are read 
in this order from what I can see in the source…

input=string
(i) Rainfall and potential evapotranspiration data file {probably a 
space delimited file with 2 columns}
output=string
(o) Output file {looks like flow is cu meters/timestep}
Qobs=string
(i) OPTIONAL Observed flow file {single column file}

My recollection is that the inputs are in terms of meters/time-step 
(flow would be cu. meters/delta-t) — but I MUST CONFIRM THIS!

The original input file in the standalone version combined the GRASS 
input & Qobs files and looked like this:

950 1.0 <====== Number of timesteps & Number of hours per time step (I 
believe)
.0000000 .0000619 .0000328
.0000000 .0000647 .0000325
.0010000 .0000619 .0000330
.0010000 .0000560 .0000333
.0010000 .0000457 .0000348
.0005000 .0000323 .0000356
.0005000 .0000156 .0000356
.0000000 .0000000 .0000356
.0005000 .0000000 .0000351

Notice that the values are very small, which makes me believe that I 
think my guess about the units of the input are correct; this could be 
different in the GRASS r.topmodel code, of course. The columns are, 
respectively, precipitation, PE, and ObsQ.

At least this can get you going. I'll try to get more on this in the 
next few days. With a little help of some of the more experienced GRASS 
module contributors, I don't mind taking this on.

Regards,
Tom

Jaime Carrera wrote:
> Hi,
>
> Has any one used the r.topmodel module? If so, I have the following 
> questions:
> 1) What are the instructions that are required in the "topmodel 
> parameters file"?
> 2) How should the topographic index statistics file be written?
>
> Cheers,
>
> Jaime
>
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-- 
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177

EMAIL:	thomas.adams at noaa.gov

VOICE:	937-383-0528
FAX:	937-383-0033