Consiglio Nazionale delle Ricerche

Tipo di prodottoArticolo in rivista
TitoloSeismic characterization of debris flows: Insights into energy radiation and implications for warning
Anno di pubblicazione2019
Autore/iCoviello, V.; Arattano, M.; Comiti, F.; Macconi, P.; Marchi, L.
Affiliazioni autoriConsiglio Nazionale delle Ricerche; Free University of Bozen-Bolzano; Autonomous Province of Bolzano
Autori CNR e affiliazioni
  • inglese
AbstractDebris flows represent a major hazard in mountainous areas, due to their rapid motion along steep channels and to the transport of large sediment volumes, including large boulders. In this paper, we present data of channelized debris flows characterized by different velocities and sediment concentrations recorded in an instrumented channel reach of the Gadria basin (eastern Italian Alps). From the analysis of the seismic energy produced by the interaction of solid particles with channel boundaries, we show that (i) the peak amplitudes are representative of the kinetic energy of each surge and (ii) most energy transfer occurs during the passage of the surge fronts. Then, we propose a debris flow detection algorithm based on the amplitude information gathered from a linear array of geophones installed along the channel. The short time average over long time average ratio of the seismic signal is used to early detect the debris flow occurrence in a continuous stream of seismic data. The algorithm recognizes moving, long-lasting sources of ground vibration (i.e., debris flows) and filters out different seismic sources (i.e., anthropic noise, earthquakes, and rockfalls). The alarm is triggered when the short time average/long time average threshold is exceeded on two geophones, progressively with time from upstream to downstream. The algorithm is employed in the early warning system installed for research purposes at Gadria. Complementary data (rainfalls, flow stage measurements, and video recordings) permitted a detailed event characterization and alarm validation. During three monitoring seasons, all debris flows were successfully detected, with the alarm lasting for their entire duration, and no false positives were produced.
Lingua abstractinglese
Altro abstract-
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Pagine da1440
Pagine a1463
Pagine totali24
RivistaJournal of Geophysical Research Earth Surface
ISSN: 2169-9011
Titolo chiave: Journal of Geophysical Research Earth Surface
Numero volume della rivista124
Fascicolo della rivista6
Verificato da refereeSì: Internazionale
Stato della pubblicazionePublished version
Indicizzazione (in banche dati controllate)
  • Scopus (Codice:2-s2.0-85067494214)
Parole chiavedebris flows, early warning systems, energy transfer, geophones, seismic monitoring
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Note/Altre informazioni-
Strutture CNR
  • IRPI — Istituto di ricerca per la protezione idrogeologica
Moduli/Attività/Sottoprogetti CNR
  • DTA.AD003.027.001 : Geomorfometria e dinamiche del sedimento nei bacini montani
Progetti Europei-