As it is known, debris flows are characterized by extreme propagation rapidity and by the ability to move highquantity of fluid mass. Furthermore, debris flows are fluid enough to travel long distances and, thus, to causedamage in vast areas, even far from the trigger ones. Debris-flow runout estimations are important for thedelineation of potentially hazardous areas. Especially in recent years, several researches have been conductedin order to define predicitive models. But, existing runout estimation methods need input parameters that canbe difficult to estimate. Recent advances in theory and in experimental research have allowed the assessmentof the physics of the debris flows. On one hand, analysis of flows of dry and solid- fluid mixtures (Azana et al,1999; Spinewine et al., 2003) have provided a foundation for a comprehensive debris flow; on the other hand,experimental data have highlighted the limitations of the theoretical models. The major part of the experimentalstudies analyze the basic kinematic conditions which determine the phenomenon evolution. The aim of the presentwork is to give a contribution on understanding of the propagation phenomenon of the debris flow providing amethod for choosing input parameters in runout estimation. This parameters are useful in numerical modelling.The analysis is conducted with the aid of experimental data collected in a laboratory flume appositely constructedat the Dipartimento di Ingegneria Civile, Ambientale e Aerospeziale – University of Palermo - Italy. Propagationconditions are analyzed for different granular concentrations.
|Numero di pagine||1|
|Stato di pubblicazione||Published - 2012|