Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6073
AuthorsPetrucci, O.* 
Polemio, M.* 
Pasqua, A.* 
TitleAnalysis of damaging hydro-geological events: the case of Calabria region (southern Italy)
Issue Date2009
Series/Report no.43
URIhttp://hdl.handle.net/2122/6073
KeywordsRainfall
Landslide
Secondary flood
Damage
Southern Italy
Subject Classification05. General::05.08. Risk::05.08.02. Hydrogeological risk 
AbstractA period of bad weather conditions due to prolonged intense rainfall and strong winds can trigger landslides, floods, secondary floods (accumulation of rain on surfaces with low permeability), and sea storms, causing damage to humans and infrastructure. As a whole, these periods of bad weather and triggered phenomena can be defined as damaging hydrogeological events (DHEs). We define a methodological approach based on seven simple indexes to analyze such events. The indexes describe the return period (T) and trend of rainfall, the extent of hit areas, and the level of damages; they can be considered attributes of georeferenced features and analyzed with GIS techniques. We tested our method in an Italian region frequently hit by DHEs. In a period of 10 years, 747 damaging phenomena (landslides, 43%; floods, 38%) and 94 DHEs have been classified. The road network and housing areas are the most frequently damaged elements, threatened by all types of damaging phenomena. T classes are almost in accordance with the level of damage. These results can be used to outline warning levels for civil protection purposes, to forecast the areas most likely to be hit and the potential ensuing damage, to disseminate information concerning vulnerable areas, and to increase people’s awareness of risk
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