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    Characteristics of debris flows just downstream the initiation area on Punta Nera cliffs, Venetian Dolomites

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    Author
    Bernard, Martino
    Berti, Matteo
    Crucil, Giacomo
    Simoni, Alessandro
    Gregoretti, Carlo
    Date issued
    2019
    Keywords
    runoff-genenerated debris flows
    initiation area
    front velocity
    flow depth
    
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    URI
    https://hdl.handle.net/11124/173171; http://dx.doi.org/10.25676/11124/173171
    Abstract
    The Piees de ra Mognes fan at the base of the Punta Nera cliffs, in the Venetian Dolomites (Italy), has been subject to debris flow activity for decades. Until recently, these debris flows never reached the National Road 51 on the valley bottom. Debris flows usually initiated at the base of an incised rocky channel in the Punta Nera cliffs where runoff is delivered to loose scree deposits of the fan. The main debris flow channel is strongly incised at the apex of the fan and splits into several minor channels at lower elevations. During the autumn 2014 and May 2016, two cliff collapses produced large debris deposits. Since then, the frequency of debris flows increased considerably because of the availability of debris deposits at very steep slope that lowered the runoff discharge needed for the debris flow initiation. In a few cases, debris flows that initiated in the rocky channel reached and interrupted the National Road 51, about 2 km downstream the well-known touristic village of Cortina d’Ampezzo. On July 2016, a monitoring station was placed at the beginning of the debris flow channel just downstream the base of the rocky channel. In the period between July and -September, the monitoring station recorded six debris flow events. Analysis of these data is used to describe the characteristics of debris flow initial routing. Moreover, we use video image analysis to investigate the velocity and depth of the surge from the 5 August 2016 event.
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