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| Titel |
Hydrogeomorphic processes and torrent control works on a large alluvial fan in the eastern Italian Alps |
| VerfasserIn |
L. Marchi, M. Cavalli, V. D'Agostino |
| 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. 3 ; Nr. 10, no. 3 (2010-03-23), S.547-558 |
| Datensatznummer |
250008010
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| Publikation (Nr.) |
 copernicus.org/nhess-10-547-2010.pdf |
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| Zusammenfassung |
| Alluvial fans are often present at the outlet of small drainage basins in
alpine valleys; their formation is due to sediment transport associated with
flash floods and debris flows. Alluvial fans are preferred sites for human
settlements and are frequently crossed by transport routes. In order to
reduce the risk for economic activities located on or near the fan and
prevent loss of lives due to floods and debris flows, torrent control works
have been extensively carried out on many alpine alluvial fans. Hazard
management on alluvial fans in alpine regions is dependent upon reliable
procedures to evaluate variations in the frequency and severity of
hydrogeomorphic processes and the long-term performance of the torrent
training works. An integrated approach to the analysis of hydrogeomorphic
processes and their interactions with torrent control works has been applied
to a large alluvial fan in the southern Carnic Alps (northeastern Italy).
Study methods encompass field observations, interpretation of aerial
photographs, analysis of historical documents, and numerical modelling of
debris flows. The overall performance of control works implemented in the
early decades of 20th century was satisfactory, and a reduction of hazardous
events was recognised from features observed in the field and in aerial
photographs, as well as from the analysis of historical records. The
2-D simulation of debris flows confirms these findings, indicating that
debris flow deposition would not affect urban areas or main roads, even in
the case of a high-magnitude event. Present issues in the management of the
studied alluvial fan are representative of situations frequently found in the
European Alps and deal with the need for maintenance of the control
structures and the pressures for land use changes aimed at the economic
exploitation of the fan surface. |
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