gis-model, erosion, simulation

[Harry Sommer DVS]

Hi folks,

I would like to create a simulation model for erosion. The data I use come
from a laser relief micrometer. The aim is to describe the surface roughness
at this microscale.
Is there anybody who has experience in building such a model?
What components (rain, soil-type???) should I take up?
Does anybody know  an algorithm to create an artificial soil surface (ASCII, 
GIF, TIFF ...)?

Thanks in advance

 Harry Sommer                                   
                                                
 Lehreinheit fuer Mathematik, Statistik und     
 Datenverarbeitung                              
 Hohenbachernstrasse 2                          
 85350 Freising                                 
 Germany                                        
________________________________________________
 e-mail: harry at castor.edv.agrar.tu-muenchen.de