 |
| Titel |
Geomorphic hazards and intense rainfall: the case study of the Recco Stream catchment (Eastern Liguria, Italy) |
| VerfasserIn |
F. Faccini, A. Robbiano, A. Sacchini |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 4 ; Nr. 12, no. 4 (2012-04-11), S.893-903 |
| Datensatznummer |
250010690
|
| Publikation (Nr.) |
 copernicus.org/nhess-12-893-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
A critical pluviometric event occurred in the
central-eastern Ligurian Riviera, 15 km from Genoa, on 1 June 2007. This
event caused landslides and hydraulic problems between Sori and Camogli and
in the inland area of the Recco Valley.
An analysis of the heavy rainfall was conducted. Hourly precipitation data
revealed a critical event between 04:00 a.m. and 07:00 a.m. local time, with more than 220 mm
of precipitation over three hours.
Slope movements were mainly debris flows that detached from the lateral
valleys of the Recco Stream catchment and from well-maintained, wooded
slopes that were also characterised by cultivated terraces.
Numerous slide planes corresponded to the interface between the surface
cover and the underlying bedrock, which presents an unfavourable geologic
structure in terms of stability assessment.
In most cases, the displaced material had a limited thickness. Debris cover
was rapidly channelled along small valleys, which controlled the critical
hydraulic conditions in the secondary drainage network.
Man-made drainage systems were partially or totally blocked in a very short
time and, like the natural watercourses, accumulated thick and extensive
alluvial fans.
Most of the instability phenomena occurred in areas that had been designated
medium or low-risk areas during land planning, and in sectors that were
defined as stable, because they lacked geomorphic indicators connected to
landslide risks.
The above considerations highlight some gaps of the Recco Stream Master
Plan. Therefore, to update this land planning tool, it is necessary to
extensively investigate local geomorphological characteristics and to adopt
a different method for assigning weights to the geohazard maps. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|