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| Titel |
Geohydrological hazards and urban development in the Mediterranean area: an example from Genoa (Liguria, Italy) |
| VerfasserIn |
F. Faccini, F. Luino, A. Sacchini, L. Turconi, J. V. De Graff |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 12 ; Nr. 15, no. 12 (2015-12-09), S.2631-2652 |
| Datensatznummer |
250119819
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| Publikation (Nr.) |
 copernicus.org/nhess-15-2631-2015.pdf |
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| Zusammenfassung |
The metropolitan area and the city of Genoa has become a national and
international case study for geohydrological risk, mainly due to the
frequency of floods. In 2014, there were landslides again, as well as flash floods that
have particularly caused casualties and economic damage. The weather features of the Gulf of Genoa and the
geomorphological–environmental setting of the Ligurian coastal land are the
predisposing factors that determine heavy rains and their resulting effects
on the ground.
This study analysed the characteristics of the main meteorological disasters
that have hit Genoa since the start of the 20th century; changes in the rainfall regime
are evaluated and the main stages of urbanization of the area are detailed,
with the resulting changes to the drainage network, in order to identify the
main causes of this high geohydrological risk. To this end, scientists have used
climate data recorded at the station of Genoa University, in operation since
1833, and at Ponte Carrega station, located in the middle reach of the Bisagno
stream, a well-known watercourse because of its frequent floods. Urban
sprawl was evaluated through a multi-temporal mapping comparison, using
maps available from the beginning of the 19th century up to the
current regional technical maps.
The average air temperature in Genoa shows a statistically significant
increase, while the number of rainy days displays an equally clear
decrease over time. The total annual rain value does not seem to indicate
rather noticeable changes. The intensity of rain in Genoa expressed as
rainfall rate, i.e.~the ratio of annual rainfall and number of rainy days,
shows statistically significant growth.
The geohydrological vulnerability in Genoa has increased over time due to
urban development which has established modifications in land use,
from agricultural to urban, especially in the valley floor. Waterways
have been confined and reduced to artificial channels, often covered in their
final stretch; in some cases they have even been totally removed. These
actions should be at least partially reversed in order to reduce the
presently high hydrological risk. |
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