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r.avaflow represents an innovative open-source computational tool for routingrapid mass flows, avalanches, or process chains from a defined release areadown an arbitrary topography to a deposition area. In contrast to mostexisting computational tools, r.avaflow (i) employs a two-phase, interactingsolid and fluid mixture model (Pudasaini, 2012); (ii) is suitable formodelling more or less complex process chains and interactions;(iii) explicitly considers both entrainment and stopping with deposition,i.e. the change of the basal topography; (iv) allows for the definition ofmultiple release masses, and/or hydrographs; and (v) serves with built-infunctionalities for validation, parameter optimization, and sensitivityanalysis. r.avaflow is freely available as a raster module of the GRASS GISsoftware, employing the programming languages Python and C along with thestatistical software R. We exemplify the functionalities of r.avaflow bymeans of two sets of computational experiments: (1) generic process chainsconsisting in bulk mass and hydrograph release into a reservoir withentrainment of the dam and impact downstream; (2) the prehistoric Acheronrock avalanche, New Zealand. The simulation results are generally plausiblefor (1) and, after the optimization of two key parameters, reasonably in linewith the corresponding observations for (2). However, we identify somepotential to enhance the analytic and numerical concepts. Further, thoroughparameter studies will be necessary in order to make r.avaflow fit forreliable forward simulations of possible future mass flow events

r.avaflow v1, an advanced open-source computational framework for the propagation and interaction of two-phase mass flows