Debris Flow Modelling In Julian Alps
Using FLO-2D
Author(s)
C. Calligaris, M. A. Boniello & L. Zini
Abstract
Val Canale Valley is located in the Italian Julian Alps, in the north-eastern
corner of Friuli Venezia Giulia Region. On 29 August 2003, the area has been
invested by a strong intensity meteorological event (rainfall maxima from
Pontebba station, which recorded the highest rainfall depths, were characterised
by return periods in the range of 500–1000 years for 3-h, 6-h and 12-h periods)
that caused debris flow phenomena. These have damaged infrastructures and
killed people. In collaboration with the Geological Service of Friuli Venezia
Giulia Region and with the contribution, for the input data, of the Department of
Territory and Sour-Forest Systems of the University of Padova, we investigated
twelve river basins located in the studied valley with different geologicalgeomorphological
characteristics. The main objective of the study is to model
the debris flow phenomena. This goal has been obtained using FLO-2D software.
In all the basins implicated, we have collected samples for grain size curve
distributions and rheological analyses in order to characterize the detritical
material. First of all it has been necessary to execute a back analysis study with
the aim of better define all the parameters involved. Subsequently, the goal has
been to simulate a new alluvional event with a return time of 200 years, on the
basis of actual morphology obtained from laser scan data (where data have been
available) realizing a DEM based on a grid cell size of 5 m. On this topographic
base it has been possible to insert the defence infrastructures realized after the
alluvional event. From all this input data it has been possible to model and to
simulate the potential debris flow with the aim to obtain, vulnerability first, and
hazard mapping later, necessary for the future territorial planning.
Keywords: debris flow, FLO-2D, mitigating measures, Alps, territorial planning.
Keywords
debris flow, FLO-2D, mitigating measures, Alps, territorial planning.
Related Book
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