Hello,
I am looking for examples of a sandpile generator abstraction in GEM. Any links to fractal system abs would be much appreciated.
Good to see the forum is back

Sandpiles

It has nothing to do with fractals, but with the external [pmpd] you have sand modelisation examples.
Also, sand isn't a stockastic system rather than a fractal? 
yeah, your right about the stockastic system... I am just starting to look into it...
I'll check out pmpd, it might offer a realistic enough model for my needs.
Cheers for that 
I just saw this thread...you might be interested in the work of Per Bak...he developed the theory of SelfOrganized Criticality. He has a good book called How the Universe Works, I think you can find a pdf of it...