Rainfall-induced landslides of the flow type are dangerous phenomena due to their high velocities and large run-out distances. Indeed, proper modeling of their propagation stage is a fundamental issue for risk analysis and management. To this aim, several factors must be taken into account to properly estimate the run-out distance and the landslide magnitude that are strongly related to an appropriate choice of the rheological properties of the moving mass. Moreover, several distinct processes must be adequately tackled such as: i) relative movement of the interstitial fluid relative to the solid fraction, ii) vertical consolidation process, iii) entrainment of material along the landslide path. All the above mentioned processes can be consistently simu-lated through the use of a depth-integrated coupled SPH model which revealed to be appropriate in simulating landslides of the flow type. In this paper, taking into account the entrainment phenomena, the above model is applied to the May 1998 Sarno-Quindici case history (Southern Italy) for which an advanced data-set is avail-able. The numerical analyses provide a satisfactory simulation of the observed propagation path, deposition heights and velocities that are strongly influenced by the entrainment rate and the extent of the erodible area.
Modeling of propagation and entrainment phenomena for landslides of the flow type: the May 1998 case study
CASCINI, Leonardo;CUOMO, SABATINO;
2012-01-01
Abstract
Rainfall-induced landslides of the flow type are dangerous phenomena due to their high velocities and large run-out distances. Indeed, proper modeling of their propagation stage is a fundamental issue for risk analysis and management. To this aim, several factors must be taken into account to properly estimate the run-out distance and the landslide magnitude that are strongly related to an appropriate choice of the rheological properties of the moving mass. Moreover, several distinct processes must be adequately tackled such as: i) relative movement of the interstitial fluid relative to the solid fraction, ii) vertical consolidation process, iii) entrainment of material along the landslide path. All the above mentioned processes can be consistently simu-lated through the use of a depth-integrated coupled SPH model which revealed to be appropriate in simulating landslides of the flow type. In this paper, taking into account the entrainment phenomena, the above model is applied to the May 1998 Sarno-Quindici case history (Southern Italy) for which an advanced data-set is avail-able. The numerical analyses provide a satisfactory simulation of the observed propagation path, deposition heights and velocities that are strongly influenced by the entrainment rate and the extent of the erodible area.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
