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Flash flood occurrence and magnitude assessment in an alluvial fan context: the October 2011 event in the Southern Apennines

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  • Antonio Santo
  • Nicoletta Santangelo
  • Giuseppe Crescenzo
  • Vittoria Scorpio
  • Melania Falco
  • Giovanni Chirico

Abstract

This study presents the analysis of flash floods triggered by an extreme rainfall event that occurred on 7 October, 2011, over the Marzano carbonate massif (Southern Apennines). The rainfall event reactivated alluvial fans built up at the outlet of two mountain basins. Detailed geological surveys carried out immediately after the event allowed the reconstruction of the main erosion and depositional processes that occurred both in the drainage basin and in the fan areas. The volume of materials eroded in the basin and deposited in the fan was evaluated by means of accurate topographic surveying and GPS measurements. Morphological and morphometric properties of the basin/fan system as well as the presence of human interventions and structures along the main channel and in the fan area influenced flow propagation. The transported materials came mainly from debris and gravels previously accumulated along the stream beds and mobilised by the flow during the event. No significant evidence of landslide contribution to transported bed load was detected. Extensive damage was done to buildings, river bank structures and agricultural crops. Despite the existence of hundreds of similar alluvial/fan systems in the Southern Apennines, few studies have been conducted to support adequate risk mitigation action in these areas. Indeed, to our knowledge, this is the first study focusing on assessing the magnitude of alluvial fan flooding in the context of the Southern Apennines. Studies like the present one may help determine the volumes involved during flash floods whilst providing support for detailed flood hazard zoning and for risk mitigation planning. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • Antonio Santo & Nicoletta Santangelo & Giuseppe Crescenzo & Vittoria Scorpio & Melania Falco & Giovanni Chirico, 2015. "Flash flood occurrence and magnitude assessment in an alluvial fan context: the October 2011 event in the Southern Apennines," 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. 78(1), pages 417-442, August.
    • Handle: RePEc:spr:nathaz:v:78:y:2015:i:1:p:417-442
    DOI: 10.1007/s11069-015-1728-4
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    References listed on IDEAS

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    1. Fan-Chieh Yu & Chien-Yuan Chen & Tien-Chien Chen & Feng-Yi Hung & Sheng-Chi Lin, 2006. "A GIS Process for Delimitating Areas Potentially Endangered by Debris Flow," 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. 37(1), pages 169-189, February.
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    Cited by:

    1. Rahman, H.M. Tuihedur & Mia, Md. Ekhlas & Ford, James D. & Robinson, Brian E. & Hickey, Gordon M., 2018. "Livelihood exposure to climatic stresses in the north-eastern floodplains of Bangladesh," Land Use Policy, Elsevier, vol. 79(C), pages 199-214.
    2. Antonio Santo & Nicoletta Santangelo & Giovanni Forte & Melania De Falco, 2017. "Post flash flood survey: the 14th and 15th October 2015 event in the Paupisi-Solopaca area (Southern Italy)," Journal of Maps, Taylor & Francis Journals, vol. 13(2), pages 19-25, November.

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