The most significant results of an archive investigation on the floods and landslides occurred in the Versilia River basin in the last centuries are presented. The main purposes are to contribute to in the assessment of the hydrogeological hazard in the Apuan-Versilian area as well as to collect useful data to catalogue disastrous events. Information on many past events was analysed. The research confirmed the vulnerability of the studied territory, which was emphasized by the tragic June 19th, 1996 hydrogeological catastrophe. Other high severity events were identified in 1636, 1774, 1846, 1885 and 1902, together with a lot of less in- tense events, causing however sensible effects. The events showed a tendency to recur in the same areas with a pronounced rise in frequency during the last centuries, likely depending on concurring factors: increased number and reliability of the information sources; increased attention to the damaging phenomena; springing up of the elements at risk; climate changes. In the Apuan-Versilian territory, the average frequency resulted of 1 sensible event every 4.2 years. Moreover, the collected data allowed a preliminary, but significant classification of the identified events; this classification was based on the event severity, deduced or estimated from the collected information. Finally, to better understand the peculiarities, a few of the most important events (years 1774, 1885 e 1902) were described in detail.
Eventi alluvionali e fenomeni franosi nelle Alpi Apuane (Toscana): primi risultati di un’indagine retrospettiva nel bacino del Fiume Versilia
D'AMATO AVANZI, GIACOMO ALFREDO;GIANNECCHINI, ROBERTO
2003-01-01
Abstract
The most significant results of an archive investigation on the floods and landslides occurred in the Versilia River basin in the last centuries are presented. The main purposes are to contribute to in the assessment of the hydrogeological hazard in the Apuan-Versilian area as well as to collect useful data to catalogue disastrous events. Information on many past events was analysed. The research confirmed the vulnerability of the studied territory, which was emphasized by the tragic June 19th, 1996 hydrogeological catastrophe. Other high severity events were identified in 1636, 1774, 1846, 1885 and 1902, together with a lot of less in- tense events, causing however sensible effects. The events showed a tendency to recur in the same areas with a pronounced rise in frequency during the last centuries, likely depending on concurring factors: increased number and reliability of the information sources; increased attention to the damaging phenomena; springing up of the elements at risk; climate changes. In the Apuan-Versilian territory, the average frequency resulted of 1 sensible event every 4.2 years. Moreover, the collected data allowed a preliminary, but significant classification of the identified events; this classification was based on the event severity, deduced or estimated from the collected information. Finally, to better understand the peculiarities, a few of the most important events (years 1774, 1885 e 1902) were described in detail.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
