Boni, G.

Cenci, L.

DE ANGELI, SILVIA

Rossello, L.

Rudari, R.

Squicciarino, G.

Trasforini, E.

English

L. Cenci

G. Squicciarino

L. Rossello

E. Trasforini

R. Rudari

G. Boni

Archivio istituzionale della ricerca - Università di Genova

Plinius Conference AbstractsVol. 15, Plinius15-12, 201615th Plinius Conference on Mediterranean Risks© Author(s) 2016. CC Attribution 3.0 License.A Gis-Based, Rapid And Holistic Flash Flood Risk Assessment ForEmergency Management ServicesLuca Cenci (1,2), Giuseppe Squicciarino (1), Laura Rossello (1), Silvia De Angeli (1), Eva Trasforini (1),Roberto Rudari (1), Giorgio Boni (1,3)(1) CIMA Research Foundation, Savona, Italy (giorgio.boni@cimafoundation.org), (2) WRR Programme, UME School,IUSS-Pavia, Italy, (3) DIBRIS, University of Genoa, Genoa, ItalyAn ideal, risk assessment should be holistic, thus, it should take into account all the components of the vulner-ability (e.g. physical, social, economic, environmental). In order to perform such analysis, a large amount oftime is needed, as well as reliable data. If a rapid risk assessment is performed (e.g. for emergency managementpurposes), a rapid but reliable procedure should be adopted.The aim of this work is to present a GIS-based, rapid and holistic flash flood risk assessment that was developedfor the Copernicus Emergency Management (EMS) Service -Risk and Recovery Mapping- and applied so far forthe activations EMS018 (Azores), EMS020 (Madeira) and EMS021 (Austria). The method was developed withthe aim to obtain a robust and quick procedure for the assessment of the risk in areas with complex orographymainly affected by flash floods, such as the Mediterranean coast.The hazard was defined according to the methodology proposed by Manfreda et al. 2014, that is based upon thedefinition of a “Flood Susceptibility Index” that accounts for upstream drainage area and local slope along thedrainage network, allowing for a qualitative hazard level definition. Five hazard levels from very low to very highare defined.The vulnerability was estimated by taking into account different indicators representative of different vulnerabilitytypologies: physical (building density, number of floors), social (population density, percentage of specificcategories at risk, i.e. children and elders), environmental (land cover). A normalized (0-1) vulnerability levelwas then assigned to each indicator. Finally, a total holistic vulnerability level was obtained as weighted meanof the previous vulnerability levels. In order to orient the scope of the analysis toward civil protection purposes,vulnerability classes and weights were defined to emphasise the vulnerability of the population to suffer directand indirect damages (e.g. higher weights to urban areas with high population and building density). The holisticvulnerability value was classified in five classes consistently with the hazard level.Finally, the risk was calculated by intersecting hazard and vulnerability according to a specific risk lookup table.The proposed approach is particularly suitable for risk and recovery mapping to be done in short time be-cause it is based on reliable information that can be rapidly and easily available during an activation: DEMs,census data and land cover layers. Furthermore, it produces a risk map that is oriented toward civil protectionpurposes. Particular attention should be paid in the definition of the vulnerability classes and weights, thereforethe experience and the judgment of the operator is an essential requirement.

A Gis-Based, Rapid And Holistic Flash Flood Risk Assessment For Emergency Management Services

https://iris.unige.it/bitstream/11567/935445/1/Plinius15-12.pdf

A Gis-Based, Rapid And Holistic Flash Flood Risk Assessment For Emergency Management Services

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Archivio istituzionale della ricerca - Università di Genova