Estimation of debris-flow magnitude in the Eastern Italian Alps
Article first published online: 4 FEB 2004
Copyright © 2004 John Wiley & Sons, Ltd.
Earth Surface Processes and Landforms
Volume 29, Issue 2, pages 207–220, February 2004
How to Cite
Marchi, L. and D'Agostino, V. (2004), Estimation of debris-flow magnitude in the Eastern Italian Alps. Earth Surf. Process. Landforms, 29: 207–220. doi: 10.1002/esp.1027
- Issue published online: 4 FEB 2004
- Article first published online: 4 FEB 2004
- Manuscript Accepted: 10 JUN 2003
- Manuscript Revised: 30 MAY 2003
- Manuscript Received: 13 AUG 2002
- National Research Council of Italy
- debris ﬂow;
The estimation of debris-ﬂow magnitude is an essential step in the assessment of debris-ﬂow hazard. Although different methods have been developed for the assessment of debris-ﬂow magnitude, this is still a difﬁcult task because of the complexity of ﬂow processes and the lack of data to test estimation procedures in many mountainous regions. Data on debris-ﬂow magnitude from 127 basins in the Eastern Italian Alps have been collected from scientiﬁc and technical journals, technical reports, historical documents gathered from local archives, and ﬁeld surveys. These data were used to develop and test different predictive approaches, encompassing regression equations, geomorphological surveys and probabilistic analysis of time series. Regression techniques were used to correlate debris-ﬂow magnitude to morphometric parameters and geological characteristics of the basins. Values of the channel debris yield rate (contribution per unit length of channel), proposed in the literature, were compared with data from the study area for identifying reference values for channel stretches of different morphological characteristics. Although limited to the few basins in which sufﬁcient data were available, the probabilistic analysis of time series of debris-ﬂow magnitude provides indications about the relations between magnitude and frequency of debris ﬂows. Some observations about the capability and drawbacks of considered methods are presented and the combined use of different approaches for the estimation of debris-ﬂow magnitude is suggested. Copyright © 2004 John Wiley & Sons, Ltd.