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Damaging hydrogeomorphological events are de- fined as one or more simultaneous phenomena (e.g. accel- erated erosions, landslides, flash floods and river floods), oc- curring in a spatially and temporal random way and triggered by rainfall with different intensity and extent. The storm rain- fall values are highly dependent on weather condition and relief. However, the impact of rainstorms in Mediterranean mountain environments depend mainly on climatic fluctua- tions in the short and long term, especially in rainfall quan- tity. An algorithm for the characterisation of this impact, called Rainfall Hazard Index (RHI), is developed with a less expensive methodology. In RHI modelling, we assume that the river-torrential system has adapted to the natural hydro- logical regime, and a sudden fluctuation in this regime, espe- cially those exceeding thresholds for an acceptable range of flexibility, may have disastrous consequences for the moun- tain environment. RHI integrate two rainfall variables based upon storm depth current and historical data, both of a fixed duration, and a one-dimensionless parameter representative of the degree ecosystem flexibility. The approach was ap- plied to a test site in the Benevento river-torrential land- scape, Campania (Southern Italy). So, a database including data from 27 events which have occurred during an 77-year period (1926-2002) was compared with Benevento-station RHI(24 h), for a qualitative validation. Trends in RHIx for an- nual maximum storms of duration 1, 3 and 24 h were also examined. Little change is observed at the 3- and 24-h du- ration of a storm, but a significant increase results in hazard of a short and intense storm (RHIx(1 h)), in agreement with a reduction in return period for extreme rainfall events.

Local models for rainstorm-induced hazard analysis on Mediterranean river-torrential geomorphological systems