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| Titel |
Numerical simulation of debris flows triggered from the Strug rock fall source area, W Slovenia |
| VerfasserIn |
M. Mikoš  , R. Fazarinc, B. Majes, R. Rajar, D. Žagar, M. Krzyk, T. Hojnik, M. Četina |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2006-04-24), S.261-270 |
| Datensatznummer |
250003402
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| Publikation (Nr.) |
 copernicus.org/nhess-6-261-2006.pdf |
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| Zusammenfassung |
| The Strug landslide was triggered in December 2001 as a rockslide, followed
by a rock fall. In 2002, about 20 debris flows were registered in the Kosec
village; they were initiated in the Strug rock fall source area. They all
flowed through the aligned Brusnik channel, which had been finished just
before the first debris flow reached the village in April 2002. Debris flow
events were rainfall-induced but also governed by the availability of rock
fall debris in its zone of accumulation. After 2002 there was not enough
material available for further debris flows to reach the village.
Nevertheless, a decision was reached to use mathematical modeling to prepare
a hazard map for the village for possible new debris flows. Using the
hydrological data of the Brusnik watershed and the rheological
characteristics of the debris material, 5 different scenarios were defined
with the debris flow volumes from 1000 m3 to a maximum of 25 000 m3. Two mathematical
models were used, a one-dimensional model
DEBRIF-1D, and a two-dimensional commercially available model FLO-2D. Due to
the lack of other field data, data extracted from available professional
films of debris flows in 2002 in the Kosec village were used for model
calibration. The computational reach was put together from an 800-m long
upstream reach and 380-m long regulated reach of the Brusnik channel through
the village of Kosec. Both mathematical models have proved that the aligned
Brusnik channel can convey debris flows of the volume up to 15 000 m3.
Under the most extreme scenario a debris flow with 25 000 m3 would
locally spill over the existing levees along the regulated Brusnik channel.
For this reason, additional river engineering measures have been proposed,
such as the raising of the levees and the construction of a right-hand side
sedimentation area for debris flows at the downstream end of the regulated
reach. |
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