[GRASS-user] Trento3D screenshots redone

[Thomas Adams]

Markus,

I understand about the modeling vs r.lake. I guess I just took the 
opportunity to make the GRASS community aware of the modeling 
possibilities and the possible direction we may go in the NWS. I really 
don't know anything about the SWIG interface; can you explain how it 
could be helpful in this application?

Regards,
Tom

Markus Neteler wrote:
> 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
>>     
>
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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