Environmental Geological Maps of San Fruttuoso Bay (Portofino Park, Italy)

Abstract: This paper presents environmental geological maps (applied geomorphology, morpho-sedimentology, ecological set-up, geomorphological hazard geothemes) of San Fruttuoso Bay (Portofino Park, Italy). The hamlet of San Fruttuoso is the most popular attraction of Portofino Natural Park and is internationally known. This charming village is located at the mouths of two steep and tiny valleys, which have headwaters at about 600 m a.s.l.; their catchments are developed entirely on conglomerate rocks. The value of the landscape and cultural heritage of this area are immense, but they are at risk from geo-hazards. The geomorphological hazards fall into three categories: landslides, debris flows and coastal erosion. Our detailed maps are based on geological, geomorphological and ecological data collected according to the following methods: a) analysis of aerial photographs at 1:13,000 scale; b) geological field survey; c) observation and comparison of historical images and maps; d) granulometric analysis of soil samples; and e) underwater survey. We believe that such geo-maps are important tools in land management studies, especially in areas threatened by natural hazards. In the case of San Fruttuoso Bay, this kind of study is even more important, given the need to preserve a world-class natural heritage site.