Set - up of a comprehensive framework for geo hydrological hazard and risk assessment at the large scale and addressed to statutory purposes

Geo-hydrologicalrisk prevention can be implemented at different scales and with different methods, depending on the final aim. The latter isin turn related to the dutiesassigned to public administrations at different territorial levels.Specifically,risk management policies and activities in Italy are delegated to different public bodies with diverse competences, that sometimes slightly overlap (and may conflict) due to a quite chaotic regulatory framework. In this context we here summarize a methodological framework set-up to support an Italian administration (region) in accomplishing its institutional duty of revising and updating the zonation of geo-hydrological hazard for statutory purposes.Then, the objective of this project is to provide a contribution in defining referencelarge-scale, multi-hazard methodologies, accounting for both scientific standards and actual availability of ancillary, officialdata, tostrengthen resilience to geo-hydrological hazard by means of effective land-use planning tools.The set-up of a comprehensive framework to provide multi-risk estimations for ranking criticalities inthe built environment and regulating future urban developmentis also planned. To achieve the specific and general objectives of the research, a sequence of tasks is being and will be implemented, articulated in different phases.For sake of synthesis these activities can be summarized as follows: GeoDB design and implementation for the collection and storage of open-source data and related optimization to make available data fit to specific technical-scientific requirements. Analysis of the spatial components of geo-hydrologic hazard, in turn composed by:Data-driven approaches to perform the initiation analysis of different landslidetypes; Empirical methods for the run-out assessment of rapid moving landslides; Set-up of a customized,hybrid (i.e., morphological and hydrological) method to outline potentiallyflooded areas within major and secondary river basins, which takes into account actual hydrological parameters (average yearly rainfalls and run-off capacity); Data-driven evaluation of the role of natural and semi-natural land covers in contrasting both landslides (in terms of root cohesion and/or obstacle function to rapid flows and rockfalls) and flooding (in terms of contribution to natural reservoir capacity) Set-up and tuning of a methodological framework for the assimilation, fusion and synthetic multi-hazard assessment and mapping over large areas, by means of semi-quantitative approaches. Design and test of a methodological framework for the implementation of preliminary, index-based multi-risk assessment based on official data sources, such as ISTAT databases, trying also toincorporate metrics of the social vulnerability. Finally, it is expected to perform a comparison and critical evaluation of outcomes of the research and current land planning toolsfor large scale policies to get insights onthe possiblegeneralizedtransfer of the newly refined methodologies to risk management policies as a non-structural measure.