The Marderello torrent, located at an altitude ranging from 3538m to 900 m above sea level (Novalesa, Cenischia Valley, in Province of Turin) is known for its peculiar capability to generate, with relative frequency, important mud flows and debris (muddy debris flow). Accordingly, the CNR-IRPI (National Research Council) of Turin, since more than twenty years ago, selected this site in order to carry out field observations and measurements campaign. In this paper the muddy-debris flow event, occurred and monitored on July 22, 2016, was considered. The simulation of debris flow phenomena was performed by a 2D Finite Volume Method, solving PDE (Partial Differential Equation) based on the shallow-water approach, through a commercial numerical software. The mathematical-numerical model, beside hydrodynamic model, may also include solid transport and movable river bottom, not explored yet at this stage of the research. First of all, a morphological vectorial model of the basin under study was created and implemented as inputs. The inflow boundary conditions, deriving from the hydrogram consisting of values measured at the monitoring gauge were considered. Several parametric analyses were performed in order to individuate the best values fitting the experimental data concerning the estimated height of the front over time. To this purpose, different available rheological options such as Turbulent-Coulomb, Turbulent-Yield, Turbulent-Coloumb-Yield, and Full Bingham were selected and tested. The comparison with the values collected by the monitored event allowed to define the best values of the parameters to be used. The selected approach and the related model construction can be considered useful and suitable tools in order to study and to simulate this kind of phenomena

Parametric Study of an Alpine Wet Debris Flow Event (Novalesa, Torino, Italy) Applying the Finite Volume Method (FVM). Comparison with Available Experimental Data

Pasculli A.
;
Sciarra N.
2019

Abstract

The Marderello torrent, located at an altitude ranging from 3538m to 900 m above sea level (Novalesa, Cenischia Valley, in Province of Turin) is known for its peculiar capability to generate, with relative frequency, important mud flows and debris (muddy debris flow). Accordingly, the CNR-IRPI (National Research Council) of Turin, since more than twenty years ago, selected this site in order to carry out field observations and measurements campaign. In this paper the muddy-debris flow event, occurred and monitored on July 22, 2016, was considered. The simulation of debris flow phenomena was performed by a 2D Finite Volume Method, solving PDE (Partial Differential Equation) based on the shallow-water approach, through a commercial numerical software. The mathematical-numerical model, beside hydrodynamic model, may also include solid transport and movable river bottom, not explored yet at this stage of the research. First of all, a morphological vectorial model of the basin under study was created and implemented as inputs. The inflow boundary conditions, deriving from the hydrogram consisting of values measured at the monitoring gauge were considered. Several parametric analyses were performed in order to individuate the best values fitting the experimental data concerning the estimated height of the front over time. To this purpose, different available rheological options such as Turbulent-Coulomb, Turbulent-Yield, Turbulent-Coloumb-Yield, and Full Bingham were selected and tested. The comparison with the values collected by the monitored event allowed to define the best values of the parameters to be used. The selected approach and the related model construction can be considered useful and suitable tools in order to study and to simulate this kind of phenomena
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11564/704837
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