Analysis and risk mitigation of a complex movement in Tessina Valley

The Tessina landslide in Chies d’Alpago (North Italy), a retrogressive roto-traslational sliding active from 1960, has not seemed to reach a quite stable configuration yet. In the past, the collapses occurred in the upper basin generated large mudflows propagating along the lower valley. At the present time, a large portion of the slope, namely Pian de Cice, shows a precarious equilibrium and is slowly sliding. To evaluate the possible consequence of the Pian de Cice collapse, the propagation of past and future mudflows was analysed with a new run-out model. The model, resolving the shallow water equations within the SPH framework, was previously calibrated on the base of some rheological tests performed on the soils collected along the valley and flume tests performed in laboratory. The model allows the prediction of future scenario but also the evaluation of efficiency of an intervention proposed for risk mitigation