During the last decades underground fluids withdrawals induced severe cases of land subsidence in Bologna, Italy. The area features middle Pleistocenic to Holocenic alluvial deposits more than 400 m thick. Here, leveling measurements revealed a subsidence rate of more than 11 cm/y from 1974 to 1981. Subsidence monitoring was carried out using a leveling network and, recently, an interferometric analysis. In 2005 two pipe extensometers were installed in the Northern outskirt of the area, set at 100 and 200 m depth, respectively. The global subsidence rate is now reduced; however, the monitoring performed by means of the two extensometers shows that subsidence rate is not constant, but features a sort of cyclical behavior over the years, with seasonal peaks.
F. BONSIGNORE, G. BITELLI, A. CHAHOUD, P. MACINI, E. MESINI, P. SEVERI, et al. (2010). Recent Extensometric Data for the Monitoring of Subsidence in Bologna (Italy). WALLINGFORD : IAHS Press.
Recent Extensometric Data for the Monitoring of Subsidence in Bologna (Italy)
BITELLI, GABRIELE;MACINI, PAOLO;MESINI, EZIO;VITTUARI, LUCA
2010
Abstract
During the last decades underground fluids withdrawals induced severe cases of land subsidence in Bologna, Italy. The area features middle Pleistocenic to Holocenic alluvial deposits more than 400 m thick. Here, leveling measurements revealed a subsidence rate of more than 11 cm/y from 1974 to 1981. Subsidence monitoring was carried out using a leveling network and, recently, an interferometric analysis. In 2005 two pipe extensometers were installed in the Northern outskirt of the area, set at 100 and 200 m depth, respectively. The global subsidence rate is now reduced; however, the monitoring performed by means of the two extensometers shows that subsidence rate is not constant, but features a sort of cyclical behavior over the years, with seasonal peaks.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
