Abstract
An extensive investigation of more than 90 landslides affecting a small river basin in Central Italy was performed by combining field surveys and remote sensing techniques. We thus defined the geomorphological setting of slope instability processes. Basic information, such as landslides mapping and landslides type definition, have been acquired thanks to geomorphological field investigations and multi-temporal aerial photos interpretation, while satellite SAR archive data (acquired by ERS and Envisat from 1992 to 2010) have been analyzed by means of A-DInSAR (Advanced Differential Interferometric Synthetic Aperture Radar) techniques to evaluate landslides past displacements patterns. Multi-temporal assessment of landslides state of activity has been performed basing on geomorphological evidence criteria and past ground displacement measurements obtained by A-DInSAR. This step has been performed by means of an activity matrix derived from information achieved thanks to double orbital geometry. Thanks to this approach we also achieved more detailed knowledge about the landslides kinematics in time and space.
Highlights
In the last 40 years, several techniques for mapping and assessing slope movements have been developed, allowing for most reliable and fast investigation [1,2,3,4]
Landslides affect most of this portion of the Dendalo stream basin and were classified as slides (15 processes), earth-flows (41 processes) and complex mass movements (41 processes) [43] (Figure 3a)
The multi-temporal aerial photos analyses showed the presence of current slope instability phenomena since 1954, indicating that the detected landslides are pre-existing and, in many cases, quite old
Summary
In the last 40 years, several techniques for mapping and assessing slope movements have been developed, allowing for most reliable and fast investigation [1,2,3,4]. Geomorphological landslide mapping is a complex problem as it is affected by several factors, such as the availability of the diagnostic data, the scale of the analyses and the final objective of the performed investigation [2,5,6,7,8]. Depending on the final purpose, several types of landslide mapping can be performed, such as landslide inventory, landslide typology and landslide state of activity maps. The standard approach in landslide mapping procedure is mainly based on the expertise of the surveyor, is affected by uncertainties and sometime subjective information. If a landslide inventory map represents a snapshot of the territory at a given moment [8], the state of activity map requires assumptions about the temporal evolution of the given processes
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