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| Titel |
The study of past damaging hydrogeological events for damage susceptibility zonation |
| VerfasserIn |
O. Petrucci, A. A. Pasqua |
| 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 Science ; 8, no. 4 ; Nr. 8, no. 4 (2008-08-19), S.881-892 |
| Datensatznummer |
250005660
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| Publikation (Nr.) |
 copernicus.org/nhess-8-881-2008.pdf |
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| Zusammenfassung |
Damaging Hydrogeological Events are defined as periods during which
phenomena, such as landslides, floods and secondary floods, cause damage to
people and the environment.
A Damaging Hydrogeological Event which heavily damaged Calabria (Southern
Italy) between December 1972, and January 1973, has been used to test a
procedure to be utilised in the zonation of a province according to damage
susceptibility during DHEs. In particular, we analyzed the province of
Catanzaro (2391 km2), an administrative district composed of 80
municipalities, with about 370 000 inhabitants.
Damage, defined in relation to the reimbursement requests sent to the
Department of Public Works, has been quantified using a procedure based on a
Local Damage Index. The latter, representing classified losses, has been
obtained by multiplying the value of the damaged element and the percentage
of damage affecting it.
Rainfall has been described by the Maximum Return Period of cumulative
rainfall, for both short (1, 3, 5, 7, 10 consecutive days) and long duration
(30, 60, 90, 180 consecutive days), recorded during the event.
Damage index and population density, presumed to represent the location of
vulnerable elements, have been referred to Thiessen polygons associated to
rain gauges working at the time of the event.
The procedure allowed us to carry out a preliminary classification of the
polygons composing the province according to their susceptibility to damage
during DHEs. In high susceptibility polygons, severe damage occurs during
rainfall characterised by low return periods; in medium susceptibility
polygons maximum return period rainfall and induced damage show equal levels
of exceptionality; in low susceptibility polygons, high return period
rainfall induces a low level of damage.
The east and west sectors of the province show the highest susceptibility,
while polygons of the N-NE sector show the lowest susceptibility levels, on
account of both the low population density and high average rainfall
characterizing these mountainous areas.
The future analysis of further DHEs, using the tested procedure, can
strengthen the obtained zonation. Afterwards, the results can prove useful
in establishing civil defence plans, emergency management, and prioritizing
hazard mitigation measures. |
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