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| Titel |
Hazard index maps for woody material recruitment and transport in alpine catchments |
| VerfasserIn |
B. Mazzorana, A. Zischg, A. Largiader, J. Hübl |
| 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 ; 9, no. 1 ; Nr. 9, no. 1 (2009-02-19), S.197-209 |
| Datensatznummer |
250006619
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| Publikation (Nr.) |
 copernicus.org/nhess-9-197-2009.pdf |
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| Zusammenfassung |
| A robust and reliable risk assessment procedure for hydrologic hazards
deserves particular attention to the role of transported woody material
during flash floods or debris flows. At present, woody material transport
phenomena are not systematically considered within the procedures for the
elaboration of hazard maps. The consequence is a risk of losing prediction
accuracy and of underestimating hazard impacts. Transported woody material
frequently interferes with the sediment regulation capacity of open check
dams and moreover, when obstruction phenomena at critical cross-sections of
the stream occur, inundations can be triggered. The paper presents a
procedure for the determination of the relative propensity of mountain
streams to the entrainment and delivery of recruited woody material on the
basis of empirical indicators. The procedure provided the basis for the
elaboration of a hazard index map for all torrent catchments of the
Autonomous Province of Bolzano/Bozen. The plausibility of the results has
been thoroughly checked by a backward oriented analysis on natural hazard
events, documented since 1998 at the Department of Hydraulic Engineering of
the aforementioned Alpine Province. The procedure provides hints for the
consideration of the effects, induced by woody material transport, during
the elaboration of hazard zone maps. |
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