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| Titel |
Detailed and large-scale cost/benefit analyses of landslide prevention vs. post-event actions |
| VerfasserIn |
G. Salbego, M. Floris, E. Busnardo, M. Toaldo, R. Genevois |
| 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. 11 ; Nr. 15, no. 11 (2015-11-06), S.2461-2472 |
| Datensatznummer |
250119771
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| Publikation (Nr.) |
 copernicus.org/nhess-15-2461-2015.pdf |
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| Zusammenfassung |
| The main aim of this paper is to
test economic benefits of landslide prevention measures vs. post-event
emergency actions. To this end, detailed- and large-scale analyses were
performed in a training area located in the northeastern Italian pre-Alps
that was hit by an exceptional rainfall event occurred in November 2010. On
the detailed scale, a landslide reactivated after 2010 event was
investigated. Numerical modeling demonstrated that remedial works carried out
after the landslide – water-removal intervention such as a drainage trench
– could have improved slope stability if applied before its occurrence.
Then, a cost/benefit analysis was employed. It defined that prevention would
have been economically convenient compared to a non-preventive and passive
attitude, allowing a 30 % saving relative to total costs. On the large
scale, one of the most affected areas after 2010 event was considered. A
susceptibility analysis was performed using a simple probabilistic model,
which allowed to highlight the main landslide conditioning factors and the
most hazardous and vulnerable sectors. In particular, such low-cost analysis
demonstrated that almost 50 % of landslides occurred after 2010 event
could be foreseen and allowed to roughly quantify benefits from regional
landslide prevention. However, a large-scale approach is insufficient to carry
out a quantitative cost/benefit analysis, for which a detailed case-by-case
risk assessment is needed. The here proposed approaches could be used as a
means of preventive soil protection in not only the investigated case
study but also all those hazardous areas where preventive measures are
needed. |
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