Integration of SBAS-DInSAR and in-situ observations for 3D numerical optimization modelling: The case study of Ivancich landslide (Assisi, Italy)

In this work we propose a numerical optimization procedure constrained by field and SBAS-DInSAR measurements, as an alternative to standard forward Finite Elements (FE) models, to deeply analyze slope instabilities. The performed optimization procedure is based on the minimization of the difference between SBAS-DInSAR data and the results of the FE model, in terms of the displacement rate. As case study to evaluate the performances of the proposed procedure, we select the Ivancich landslide, located in the eastern part of the Assisi municipality (central Italy), and affected by an active slow-moving landslide since its first urbanization process. In this case, we focused on the Newtonian approach by considering a creeping flow approximation, suitable to simulate the kinematic trend of the investigated site. In addition, a set of 39 SAR images, acquired by COSMO-SkyMed constellation between 2009 and 2012, was exploited to generate deformation time series.