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Empirical modelling of the May 1998 small debris flows in Sarno (Italy) using LAHARZ

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  • D. Dorta
  • G. Toyos
  • C. Oppenheimer
  • M. Pareschi
  • R. Sulpizio
  • G. Zanchetta

Abstract

The catastrophic events that occurred in May 1998 in the area of Sarno (Southern Italy) highlight the destructive potential of debris flows, even when they are of relatively low magnitude. More than 130 people were killed and severe property damage took place when volcaniclastic debris flows triggered by heavy rainfall inundated various towns located in piedmont areas. This work investigates the suitability of LAHARZ, a GIS-assisted method for the automatic delineation of lahar inundation areas, for reproducing the May 1998 flows at Sarno. It was found that recalibration of the empirical relationship employed by LAHARZ is required in order to realistically hind-cast the inundation areas of considered events. The potential for further improvements in prediction outputs for this type of geomorphic setting is discussed, taking into account the observed lower mobility of these small volcaniclastic debris flows as compared to lahars of similar size. Copyright Springer Science+Business Media B.V. 2007

Suggested Citation

  • D. Dorta & G. Toyos & C. Oppenheimer & M. Pareschi & R. Sulpizio & G. Zanchetta, 2007. "Empirical modelling of the May 1998 small debris flows in Sarno (Italy) using LAHARZ," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 40(2), pages 381-396, February.
    • Handle: RePEc:spr:nathaz:v:40:y:2007:i:2:p:381-396
    DOI: 10.1007/s11069-006-0035-5
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    References listed on IDEAS

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    1. Dieter Rickenmann, 1999. "Empirical Relationships for Debris Flows," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 19(1), pages 47-77, January.
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