Modelling debris flows on gradually varying slopes_ an application to Moscardo Torrent (Paluzza, Friuli Venezia Giulia, Italy) data

30ARATTANO M., DEGANUTTI A.M., 1996, Modelling debris flows on gradually varying slopes_ an application to Moscardo Torrent (Paluzza, Friuli Venezia Giulia, Italy) data, VIII international conference and field trip on landslides, Granada, Spain 27-28 September 1996, pp. 109–116, Granada, Spain, 27-28 September 1996,
URL: http://www.cnr.it/prodotto/i/239841

Debris flows are among the most dangerous natural hazards that affect human lives and properties. They usually occur in small mountain basins and very often initiate at the highest elevations, on very steep slopes, move down the torrent, reach the alluvial fan and stop when they meet more gentle slopes. Therefore a mathematical model that would realistically describe these kind of phenomena must take into account, among the other factors, a changing slope with distance. We apply here a simple mathematical solution for debris flows in channels with a changing slope to some debris flows occurred in 1991, 1992 and 1993 in the Moscardo Torrent, a small mountain creek in the North-Eastern Italian Alps. This creek was known to the local community to produce one or more debris flows per year. Thus in 1989 the CNR (National Research Council) IRPI Institute of Turin instrumented it with two gaging stations, equipped with ultrasonic sensors, that were placed at a distance of 300 m from each other, on the alluvial fan of the creek. A raingauge was also installed not far from the upper basin divide. The results of the mathematical model are compared with the available records.

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