Hazard index maps for woody material recruitment and transport in alpine catchments

Mazzorana, B.; Zischg, Andreas Paul; Largiader, A.; Hübl, J. (2009). Hazard index maps for woody material recruitment and transport in alpine catchments. Natural Hazards and Earth System Sciences, 9(1), pp. 197-209. Copernicus Publications 10.5194/nhess-9-197-2009

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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 crosssections 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Zischg, Andreas Paul

Subjects:

500 Science > 550 Earth sciences & geology
900 History > 910 Geography & travel
500 Science

ISSN:

1561-8633

Publisher:

Copernicus Publications

Language:

English

Submitter:

Mirjam Stawicki

Date Deposited:

01 Sep 2015 10:35

Last Modified:

01 Sep 2015 10:35

Publisher DOI:

10.5194/nhess-9-197-2009

BORIS DOI:

10.7892/boris.71340

URI:

https://boris.unibe.ch/id/eprint/71340

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