[GRASS-user] Suggestions for backward modelling of a river system

2010-03-17 Thread Marc Stonestreet
Hi all Can anyone suggest a method to backward model a river system's flow path that can integrate with srtm data? I am seeking a way (if possible ) to look back in time at the paleo-course of a river system. I have no doubt that a solution would be a complex undertaking - could anyone

[GRASS-user] Suggestions for backward modelling of a river system

2010-03-17 Thread Marc Stonestreet
Hi all Can anyone suggest a method to backward model a river system's flow path that can integrate with srtm data? I am seeking a way (if possible ) to look back in time at the paleo-course of a river system. I have no doubt that a solution would be a complex undertaking - could anyone

Re: [GRASS-user] Suggestions for backward modelling of a river system

2010-03-17 Thread Achim Kisseler
Hi, that mean, as I understand, that you have to have a paleo DEM. You have to ask the question: On what data basis do I want to reconstruct paleo landscape? Geomorphological changes cannot be reconstructed just with a present day DEM. Achim On 17.03.2010 14:21, Marc Stonestreet wrote:

Re: [GRASS-user] Suggestions for backward modelling of a river system

2010-03-17 Thread Maris Nartiss
One can't turn back time, still I also have been thinking about playing with erosion models in backwards mode. If it's possible to calculate current erosion rate and eroded material ammount, it should be possible to add erroded material to DEM, repeat erosion model run on new DEM and in such way

Re: [GRASS-user] Suggestions for backward modelling of a river system

2010-03-17 Thread Achim Kisseler
That erosion processes are highly non-linear. Running physical based erosion models in backwards-mode is not possible I would bet. I guess one have to work with ground layers, geological land rising and lowering, climatic changes and so on. But well-wrought concept ideas are always welcome.

Re: [GRASS-user] Suggestions for backward modelling of a river system

2010-03-17 Thread Achim Kisseler
By the way: it depends on the detail! Pre glacial reconstruction of watersheds from isostatical land-level-changes (ger. Ausgleichsbewegungen) were done for noth america. I think it was last year. Regards, Achim On 17.03.2010 22:52, Achim Kisseler wrote: That erosion processes are highly