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| Titel |
Analysis of debris-flow recordings in an instrumented basin: confirmations and new findings |
| VerfasserIn |
M. Arattano, L. Marchi, M. Cavalli |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2012-03-22), S.679-686 |
| Datensatznummer |
250010611
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| Publikation (Nr.) |
 copernicus.org/nhess-12-679-2012.pdf |
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| Zusammenfassung |
| On 24 August 2006, a debris flow took place in the Moscardo Torrent, a basin
of the Eastern Italian Alps instrumented for debris-flow monitoring. The
debris flow was recorded by two seismic networks located in the lower part
of the basin and on the alluvial fan, respectively. The event was also
recorded by a pair of ultrasonic sensors installed on the fan, close to the
lower seismic network. The comparison between the different recordings
outlines particular features of the August 2006 debris flow, different from
that of events recorded in previous years. A typical debris-flow wave was
observed at the upper seismic network, with a main front abruptly appearing
in the torrent, followed by a gradual decrease of flow height. On the
contrary, on the alluvial fan the wave displayed an irregular pattern, with
low flow depth and the main peak occurring in the central part of the surge
both in the seismic recording and in the hydrographs. Recorded data and
field evidences indicate that the surge observed on the alluvial fan was not
a debris flow, and probably consisted in a water surge laden with fine to
medium-sized sediment. The change in shape and characteristics of the wave
can be ascribed to the attenuation of the surge caused by the torrent
control works implemented in the lower basin during the last years. |
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