Debris Flow Hazard And Mitigation Works In Fiames Slope (Dolomites, Italy)
Author(s)
P. R. Tecca, C. Armento & R. Genevois
Abstract
Active debris flow scree in the territory of Cortina d’Ampezzo (Dolomites, Italy)
seriously threatens the urbanized areas and the state road. In September 1997,
following a 25.000 m 3 magnitude debris flow that temporarily dammed the river,
a retention basin with a storage capacity of about 15000 m 3 , was built upstream
the state road. In this paper, the effectiveness of the existing debris basin has
been evaluated regarding to the magnitude of the design debris flow. Based on
geomorphological and historical data, major events up to 30.000 m 3 may be
possible. To avoid destruction caused by debris flows, new mitigation measures
are planned. Proper zoning is implemented, but for the state road cannot be
relocated, both passive and active mitigation measures must be adopted. A
warning system has been designed, based on both the early detecting of debris
flow-induced ground vibrations and the overcoming of rain thresholds, for
stopping the traffic on the state road in the event of a debris flow. As it is not
possible to mitigate debris flows along the flow paths, the most suitable action to
reduce the risk is to control the debris deposition. Proper design requires an
estimate of the magnitude, frequency and delineation of debris flow hazard and
risk of the site, together with fundamental information such as possible runout
distances, depth, velocities and impact force of a design debris flow. For this
purpose, a two-dimensional flow routing model, FLO-2D, has been used, based
on a detailed DEM of the site, data collected in a similar neighbour debris flow
monitored site and reasonable assumptions regarding sediment concentration and
other rheological parameters. A more effective design of a retention basin is
proposed.
Keywords: debris flows, Dolomites, FLO-2D, mitigating measures.
Keywords
debris flows, Dolomites, FLO-2D, mitigating measures.
Related Book
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