Multi-risk mitigation in art cities

This contribution describes a multi-risk mitigation framework for art cities. The workflow considers two different hazard sources i.e., floods and earthquakes. The procedure conceives a coherent path for geospatial data analysis and mapping. The different risks are treated separately and later combined by a unified exposure modelling. The multi-risk is defined in terms of direct economic losses through the Average Annual Loss of the assets. The methodology is applied to a portion of the historical centre of Florence, which is listed a UNESCO World Heritage site because of the integrity, authenticity, and outstanding value. The current state leads to multi-risk losses of the order of 3.15 M€/year. The study provides insights regarding the mutual interactions within the two risks, pointing out the influence of the historical evolution and the urbanization process shaping the multi-risk. The effectiveness of mitigation strategies is then discussed in terms of risk reduction of the historical centre, highlighting the differences within the different hazard sources.