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We introduce a GPU-accelerated simulation tool, named Modeling on ShallowFlows with Efficient Simulation for Two-Phase Debris Flows (MoSES_2PDF), ofwhich the input and output data can be linked to the GIS system for engineeringapplication. MoSES_2PDF is developed based on the CUDA structure so that it canwell run with different NVIDIA GPU cards, once the CUDA vers. 9.2 (or higher)is installed. The performance of the MoSES_2PDF is evaluated, and it is foundthat the present GPU-CUDA implementation can enhance efficiency by up to 230folds, depending on the PC/workstations, models of GPU card, and the meshnumbers in the computation domain. Two numerical examples are illustrated withtwo distinct initial inflow conditions, which are included in two modes ofMoSES_2PDF, respectively. In the numerical example of a large-scale event, the2009 Hsiaolin event, the results computed by two distinct NVIDIA GPU cards(RTX-2080-Ti and Tesla-V100) are found to be identical but only tiny deviationis figured out in comparison with the results computed by the conventionalsingle-core CPU-code. It is speculated to be caused by the different structuresin the source codes and some float/double operations. In addition to theillustration in the GIS system, the computed results by MoSES\_2PDF can also beshown with animated 3D graphics in the ANSI-Platform, where the user caninteract with 3D scenes. The feasibility, features, and facilities ofMoSES\_2PDF are demonstrated with respect to the two numerical examplesconcerning two real events.

MoSES_2PDF: A GIS-Compatible GPU-accelerated High-Performance Simulation Tool for Grain-Fluid Shallow Flows