ORIN-3D-A new model for efficient simulation of landslide motion on a GPU using CUDA

Extremely-rapid flowlike landslide are a major hazard in many parts of the world, and managing their risk re-quires an understanding of the mechanisms that drive motion, as well as reliable predictions of their potential destructiveness. Numerical runout models are one tool that can be used for both these applications, however their utility is presently limited by their computational runtime. In the present work, a new depth-averaged, smooth particle hydrodynamics based model is implemented to run on a graphical processing unit. The new implementation provides a speedup of over two orders of magnitude, compared to a commonly used CPU based runout model. The new model has been validated, and then is used to back-analyse the Johnsons Landing Landslide. It is shown that increasing model resolution results in an accurate simulation of complex topographic interactions between the flowing landslide and the surface topography. The new model runs on commercially available GPU's, and should therefore be useful for both researchers and practitioners seeking to understand and quantify landslide hazard and risk.

Automated summary

A new depth-averaged hydrodynamics model based on smooth particle simulation has been implemented to run on a graphical processing unit, providing a significant speedup compared to traditional CPU-based models. The model has been validated and shown to accurately simulate complex interactions between flowing landslides and surface topography.