Il contributo dell'interferometria radar satellitare per l'identificazione e caratterizzazione dei fenomeni franosi a differenti scale d'indagine

This paper reports the results of a feasibility study on potentialities and limits of using DInSAR (Differential Synthetic Aperture RADAR Interferometry) techniques in landslide phenomena analysis at different scales (basin and slope scale). The study area is the Agno Valley, located in the NE sector of Italian Alps (Vicenza Province, Veneto Region, Italy). At the basin scale, factors that limit the applicability of inteferometric techniques, have been investigated. Portions of RADAR images affected by geometric distortion (layover and shadowing) are compared with morphometric factors (aspect and slope) and with land use data. The results show that areas affected by distortions are very limited and the presence of steep slope is the main factor limiting theapplicability of SAR interferometric techniques. At slope scale, time-series displacement data derived from Persistent Scatters processing are analysed to evaluate the state of activity of landslide phenomena that occur in Rovegliana-Cappellazzi area (North sector of Agno Valley). Furthermore, displacement data have been compared with rainfall data to investigated landslide triggering factors. In conclusion, interferometric data interpretation jointly with geomorphologic analysis resulted a helpful tools in landslide identification and characterization.