Debris Flow Rainfall Thresholds In Val Canale
Valley: First Steps Into Their Redefinition
Author(s)
C. Calligaris, L. Zini & F. Cucchi
Abstract
Debris flows can be considered as highly hazardous hydrological processes very
common in the whole Alpine environment, such as in the Friuli Venezia Giulia
Region located in the extreme northeastern side of Italy. The progressive
increase in socio-economic activities during these last years has created, in the
mountain regions, the potentiality for an increased risk related to this kind of
destructive phenomena. After the critical alluvial event which occurred on 21–22
June 1996 in the Fella watershed and the alluvial event of 29th August 2003 in
the Val Canale valley when more than 293 mm of rain were recorded by
Pontebba’s rain-gauge in four hours (the total influx of the meteorological event,
which lasted about 12 h was equal to 389.6 mm) the need arose to deeply
investigate the interpretation of the rainfall thresholds and on their redefinition.
The analyzed examples show that there is a considerable increase in the intensity
of the rainfall with a duration equal to or less than 24 hours. Above all – very
critical for debris flow – are the rains of 1 to 6 hour duration having an intensity
greater than 50 mm/hour.
Keywords: debris flow, rainfall thresholds, Val Canale valley.
1 Introduction
Debris flow phenomena are processes that frequently develop in an alpine
environment and are considered one of the most dangerous and devastating due
to their velocity and destructive capacity (Marchi [1]; Sosio et al. [2]; Calligaris
and Zini [3]; Calligaris et al. [4]): the landslide phenomena may involve areas
extending to 80–90 km2 (Slaymaker [5]).
The Val Canale Valley, located in the extreme northeastern part of Italy, has
been repeatedly affected during the last century by debris flow phenomena
Keywords
debris flow, rainfall thresholds, Val Canale valley.
Related Book
Other papers in this volume
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