The PLK model is described in Perla, R.I., K. Lied and K. Kristensen. 1984. Particle simulation of snow avalanche motion. Cold Regions Science of Technology 9, 191- 202.
Follow the link to the zip file containing the executable (PLK.exe), readme.txt, and a sample input file (parab.txt) for PLK 2000.
This model and documentation are provided without any implied merit for any purpose, or technical support.