Perimetrazione del rischio idrogeologico connesso alle piene fluviali: aspetti metodologici e operativi di un caso di studio in Calabria centrale

Abstract

A methodological experience dealing with delimitation of flood-prone-areas has been described. After the illustration of methodological approach, a case study concerning a Calabria area is presented. In this region of Southern Italy, the river network is made of ephemeral streams characterised by flash floods and huge bed-load. The methodology develops in four main steps: 1) a detailed research about historical flood events and induced damages on a temporal window of about 400 years; 2) the multi-temporal observation of morphological river geometry, carried out using maps and air-photos of different epochs; 3) the statistical characterisation of maximum rainfall that can be expected in the study area; 4) the evaluation of stream water depth for different return period flow. The results obtained point out that, in the study area, during the analysed period, flood risk is increased, mainly because of the urban growth. Improvements to the obtained results, can be obtained assessing and taking into account the modifications induced by engineering works.