Between 9th and 10th September 2017 a catastrophic, very intense rainfall event struck the city of Livorno in the Tyrrenian coast of central Italy caus-ing 8 fatalities. The event was characterized by very high rainfall intensity (>100mmh−1) that persisted on a small portion of territory causing huge rainfall accumula-tions (>260 mm). The aim of the work is to reconstruct the flash flood to understand how much the event was exceptional under the hydrologic and impact aspects. The rainfall event and the inundation have been reconstructed by analyzing the rain gauge data of the regional hydrologic service. The discharges have been simulated using MOBIDIC, a continuous distributed hydrologic model already operational in the region for hydrologic predictions. The exposure and damages to buildings have been analyzed and compared with the official claims. The results show that the flash flood was exceptional since most of the river reaches in the area have overcome of about 50% the 200 years return period discharge, used to design the flood defenses according to the national regula-tions.
The 2017 flash flood of Livorno: lessons learnt from an exceptional hydrologic event / Chiara Arrighi; Fabio Castelli. - ELETTRONICO. - (2020), pp. 1-5. (Intervento presentato al convegno 2nd International Workshop on Natural Hazards).
The 2017 flash flood of Livorno: lessons learnt from an exceptional hydrologic event.
Chiara Arrighi
;Fabio Castelli
2020
Abstract
Between 9th and 10th September 2017 a catastrophic, very intense rainfall event struck the city of Livorno in the Tyrrenian coast of central Italy caus-ing 8 fatalities. The event was characterized by very high rainfall intensity (>100mmh−1) that persisted on a small portion of territory causing huge rainfall accumula-tions (>260 mm). The aim of the work is to reconstruct the flash flood to understand how much the event was exceptional under the hydrologic and impact aspects. The rainfall event and the inundation have been reconstructed by analyzing the rain gauge data of the regional hydrologic service. The discharges have been simulated using MOBIDIC, a continuous distributed hydrologic model already operational in the region for hydrologic predictions. The exposure and damages to buildings have been analyzed and compared with the official claims. The results show that the flash flood was exceptional since most of the river reaches in the area have overcome of about 50% the 200 years return period discharge, used to design the flood defenses according to the national regula-tions.
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