Quoted from:http://www.saga-gis.org/en/index.html

The Gravitational Process Path (GPP) model can be used to simulate the process path and run-out area of gravitational processes based on a digital terrain model (DTM). The conceptual model combines several components (process path, run-out length, sink filling and material deposition) to simulate the movement of a mass point from an initiation site to the deposition area. For each component several modeling approaches are provided, which makes the tool configurable for different processes such as rockfall, debris flows or snow avalanches.

The tool can be applied to regional-scale studies such as natural hazard susceptibility mapping but also contains components for scenario-based modeling of single events. Both the modeling approaches and precursor implementations of the tool have proven their applicability in numerous studies, also including geomorphological research questions such as the delineation of sediment cascades or the study of process connectivity.

Please provide the following reference in your work if you are using the GPP model:

Wichmann, V. (2017): The Gravitational Process Path (GPP) model (v1.0) - a GIS-based simulation framework for gravitational processes. Geosci. Model Dev., 10, 3309-3327, doi:10.5194/gmd-10-3309-2017 https://doi.org/10.5194/gmd-10-3309-2017.