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| Titel |
The efficiency of a risk reduction program for debris-flow disasters – a case study of the Songhe community in Taiwan |
| VerfasserIn |
S. C. Chen, C. Y. Wu, B. T. Huang |
| 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 ; 10, no. 7 ; Nr. 10, no. 7 (2010-07-16), S.1591-1603 |
| Datensatznummer |
250008315
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1591-2010.pdf |
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| Zusammenfassung |
| A risk reduction program was developed after debris-flow disaster analysis is
conducted using mitigation structures, evacuation measures and community
restrained expansion strategy. The risk assessment method delineates hazard
zones and analyzes vulnerability and the resilient capacity of an affected
area, allowing the prediction of losses of properties and lives, and the
corresponding risk. It can also be used to evaluate performance of a risk
reduction program. The proposed method was applied to the Songhe community as
a case study to assess debris-flow risk and performance of reduction programs
consisting of mitigation structures, evacuation measures and a restrained
expansion strategy. Total annual risk decreased to $0.01 million from
$0.72 million for the No. 1 Torrent and to $0.36 million from
$1.22 million for the No. 2 Torrent after mitigation structures were
installed, and evacuation measures were implemented based on restrained
expansion. Although mitigation structures are costly, they can reduce the
size of hazard zones. Delimitating the Designated Soil and Water Conservation
Area restrains community expansion and decreases possible losses. Although
evacuation measures cannot reduce the size of hazard zones, they effectively
increase the resilient capacity of residents. The benefit-cost ratio for
mitigation structures exceeds 1.0 for both torrents with an average of 3.87;
the benefit-cost ratio for evacuation measures is markedly greater than 1.0.
Combining mitigation structures and evacuation measures increases the total
benefit with a benefit-cost ratio of 4.38. Analytical results showed that the
risk reduction program is cost-effective. |
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