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An experimental apparatus, consisting of a tilting flume and a final horizontal\udplane, has been used to investigate the depositional features of debris materials\udcollected from the Pulsano watershed (Southern-Italy). Experiments have been\udcarried out to study the flow behaviour of mixtures at sediment concentrations\ud0.4≤Cv≤0.6 and maximum grain size of the particles 4mm≤d≤19mm. The flow\udbehavior is described on the basis of the evolution of the front position in the\udchannel and of the runout distance, lateral spreading and flow depth in the\udhorizontal plane. An attempt is made to rate the experimental flows according to\udthe classification of flow regimes based on threshold values of dimensionless\udBagnold, Savage and Friction numbers. As a conclusion the experimental results\udhighlight a threshold behaviour of debris-flow mixtures in the runout phase. This\udresults from a particular combination of maximum grain diameters in play and a\udvolumetric concentration limit. When approaching such combination the shape\udand the maximum length of the deposit change drastically if compared to those\udof the inertia-dominated regime

Debris-flow runout distance: laboratory experiments on the role of Bagnold, Savage and friction numbers