 |
| Titel |
Damage costs due to bedload transport processes in Switzerland |
| VerfasserIn |
A. Badoux, N. Andrés, J. M. Turowski |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 2 ; Nr. 14, no. 2 (2014-02-18), S.279-294 |
| Datensatznummer |
250118275
|
| Publikation (Nr.) |
 copernicus.org/nhess-14-279-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| In Alpine regions, floods are often associated with
erosion, transport and deposition of coarse sediment along
the streams. These processes are related to bedload transport
and pose a hazard in addition to the elevated water discharge.
However, it is unclear to what extent they contribute
to total damage caused by natural hazards. Using the Swiss
flood and landslide damage database – which collects financial
damage data of naturally triggered floods, debris flows
and landslides – we estimated the contribution of fluvial bedload
transport processes to total damage costs in Switzerland.
For each database entry an upper and lower limit of financial
losses caused by or related to bedload transport processes
was estimated, and the quality of the estimate was judged.
When compared to total damage, the fraction of bedload
transport damage in the 40 yr study period lies between 0.32
and 0.37. However, this value is highly variable for individual
years (from 0.02 to 0.72). Bedload transport processes
have induced cumulative financial losses between CHF 4.3
and 5.1 billion. Spatial analysis revealed a considerable heterogeneous
distribution with largest damage for mountainous
regions. The analysis of the seasonal distribution shows
that more than 75% of the bedload damage costs occurs in
summer (June–August), and ~ 23% in autumn (September–
November). With roughly 56%, by far most of the damage
has been registered in August. Bedload transport processes
are presently still inadequately understood, and the predictive
quality of common bedload equations is often poor. Our
analysis demonstrates the importance of bedload transport as
a natural hazard and financial source of risk, and thus the
need for future structured research on transport processes in
steep streams. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|