Studio della pericolosità geomorfologica in aree produttive del bacino montano del Fiume Panaro (Appennino Settentrionale)

This paper illustrates the study of geomorphological hazards (landslides and fluvial processes) that affect productive sites within the mountain basin of the Panaro river. The research, carried out in three phases, was aimed to produce detailed maps of geomorphological instability phenomena and of geomorphological hazard. In the first phase, the crossing, in GIS, of General Land Regulation Plans and Landslide Inventory Maps has allowed to select 16 productive areas (extent > 2 hectares). In phase two, the study and cartography of instability phenomena in the selected areas have been based upon the analysis of bibliographic data and of geological reports, upon the interpretation of temporal series of multi-scale aerial photographs and satellite images and upon field investigations. The great amount of data has been organized and structured within a GIS database. In phase three, the cartography of geomorphological hazards has been carried out using a methodology based on a matrix that correlates intensity and frequency classes of instability phenomena: this allows to define the different hazard levels. This study has highlighted how, in many places, data on instability phenomena (both in terms of space and time) do not correspond with the picture reported by the Landslide Inventory Map of the Modena Province.