Emergency management of landslide risk during Autumn-Winter 2008

Iovine G. (1), Iaquinta P. (1), Terranova O. (1), 2009, Emergency management of landslide risk during Autumn-Winter 2008, 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, pp. 2686–2693, Cairns, Australia, 13-17 July 2009,
URL: http://www.cnr.it/prodotto/i/88920

The rains fallen in the last Autumn-Winter seasons, abundant and prolonged over wide sectors of Southern Italy, confirmed the overall fragility of the territory by triggering a great number of slope movements and erosive processes, floods along numerous streams, inundation of cultivated fields and of urbanised sectors, and coastal instabilities induced by sea-storms. In Calabria, located at the southernmost tip of the boot, the recent geo-hydrological crisis was so severe that the Italian Government had to declare the "state of emergency" on 30 January 2009. The inheritance of the Autumn-Winter 2008/2009 extends over large portions of the territory. Among the examined cases, those characterized by conditions of "imminent danger" to public safety resulted mainly located in the NW sector of the region, along the Eastern slope of the Coastal Chain, and subordinately along its Western slope facing the Tyrrhenian Sea. Other villages were also threatened by slope instabilities along the Southern Tyrrhenian and on the Jonian coasts. In the present study, the progressive mobilization of a rainfall-induced slope movement threatening the Southern suburbs of San Benedetto Ullano (Cosenza), activated on 28 January (and still active in early April), is briefly described. The results of a detailed geomorphologic field survey, repeated in time to properly recognising the evolution of the phenomenon, combined with the cross-analysis of rainfall data and superficial displacements at a number of datum points, allowed to support the Major of the village for better managing the state of geo-hydrological emergency. The assessment of the scenarios related to the presumable development of the phenomenon is in progress. The simplified control system, promptly implemented during the first phases of analysis, will be refined in the next months, based on geological and kinematic data which will be progressively gathered via explorative drillings and thanks to the installation of essential instrumentations. Accordingly, even the set of provisional emergency procedures devised from the very beginning of the study will be detailed and may be arranged into a refined Decision Support System; advices for slope remediation will also be given to the local administration.

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