Analisi di laboratorio e di campo di alcuni aspetti della dinamica degli ammassi granulari

Some aspects of debris flow dynamics in the lab and on the field have been analized in this thesis. Different tests have been performed employing an experimental flume made of a plain pair set to a different slope. Tests have been carried out on a open slope and on a channelized slope, employing different granular materials that differ from one another for their grain size distribution, their density, their shape factor and rheologic properties. The main material phisical parameters have been experimentally determined. The experimental equipment is provided with a set of eight cameras controlled by a software and hardware system in order to capture 15 fps simultaneously and its main purpose is the tridimensional photogrammetric reproduction of the granular mass evolution during its movement. Experimental data processing have been made, mostly, from photogrammetric survey. Field investigation have been carried out in the debris flow site of Acquabona, near Cortina d’Ampezzo (BL), during the 2015 spring and summer periods. The upstream and downstream monitoring stations of the existing monitoring system have been partially activated. A midstream station that has to be installed in the next monitoring season has also been designed. Combined analysis of the observations made with the camera installed in the downstream station and of rain data form raingauges installed inside the rio Acquabona basin have been performed. Besides some field observations about creek bedforms, active bank landslides feeding the channel with debris and comparison between online meteorological services forecasting capability and field data have been made