[GRASS-user] Trento3D screenshots redone

[Markus Neteler]

Tom,

I didn't intend to make some real hydrological modeling. r.lake
isn't written for that.

In fact, it will be a good idea to connect to external models.
E.g. the SWIG interface could be of help here.

Markus

On Fri, May 19, 2006 at 09:49:41AM -0400, Thomas Adams wrote:
> Paulo,
> 
> You're right about the need for modeling. Actually, the modeling would 
> be done outside of GRASS and then have the appropriate water surface 
> elevation data imported into GRASS to show the inundated areas. The 
> hydraulic modeling *could* be done withing GRASS, but a better first 
> step probably would be to do the modeling outside of GRASS and then 
> import the data. An additional advantage to this is that there are many 
> hydraulic models and one may have a preference as to which to use or, 
> not be restricted to a particular model, thereby retaining more flexibility.
> 
> Tom
> 
> 
> pmarc wrote:
> >2006/5/19, Thomas Adams <Thomas.Adams at noaa.gov>:
> >>Hamish & Markus,
> >>
> >>How did you do the inundation? With r.lake; does this use a level
> >>surface? If so, this is not correct for a river, due to the downstream
> >>slope of the topography and the hydrodynamics of the flow. The resulting
> >>water surface elevations would be less than a level surface. Channel &
> >>overbank cross-sections are needed (corresponding to those used in a
> >>dynamic flow model) which then need to be intersected with the
> >>topography. The US Army Corps of Engineers HEC-RAS & HEC-GeoRAS software
> >>that is integrated with ArcGIS does this correctly.
> >
> >Well, that was just to showcase possibilities and then you come with a
> >class on hidrology!!
> >
> >Thanks!
> >
> >I think it should be easy to add a slope to that flood surface, but
> >that would be still incorrect.
> >The solution would be to implement a flood modelling routine, but
> >then, this is the beauty of free software! However, with all my
> >excitement about all this, I am not the person to implement it... I'm
> >still lacking some work on the localization of GRASS....
> >
> >I think I speak for the whole community when I say we are glad to see
> >GRASS being used is such hi-profile tasks.
> 
> 
> -- 
> 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