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Flood-induced ground effects and flood-water dynamics for hydro-geomorphic hazard assessment: the 21–22 October 2019 extreme flood along the lower Orba River (Alessandria, NW Italy)

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  • Andrea Mandarino
  • Fabio Luino
  • Francesco Faccini

Abstract

The knowledge of flood-induced ground effects and flood-water dynamics is a crucial issue for hydro-geomorphic hazards assessment and mapping, and thus for river management and land use planning. This paper and the related 1:15,000 map illustrate the lower Orba River (NW Italy) and its adjacent floodplain geomorphic response to the 21–22 October 2019 extreme flood. This was estimated to be a 500-years flood and caused severe damage to cultivated fields, structures, and infrastructures. The research is based on extensive post-flood field surveys, ante- and post-flood GNSS surveys, and aerial photographs interpretation. Intense in-channel sediment mobilization, bank retreats, and channelization structures collapses were surveyed. Furthermore, alluvial gullies, overbank deposits, crevasse splays, and surficial-erosion evidences were mapped over the floodplain, along with the flooded area (17.65 km2) and the flood-water features. A specific legend developed for flood-related and anthropogenic elements mapping in a typical lowland agricultural landscape with regulated rivers is proposed.

Suggested Citation

  • Andrea Mandarino & Fabio Luino & Francesco Faccini, 2021. "Flood-induced ground effects and flood-water dynamics for hydro-geomorphic hazard assessment: the 21–22 October 2019 extreme flood along the lower Orba River (Alessandria, NW Italy)," Journal of Maps, Taylor & Francis Journals, vol. 17(3), pages 136-151, June.
    • Handle: RePEc:taf:tjomxx:v:17:y:2021:i:3:p:136-151
    DOI: 10.1080/17445647.2020.1866702
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    Cited by:

    1. Gianna Ida Festa & Luigi Guerriero & Mariano Focareta & Giuseppe Meoli & Silvana Revellino & Francesco Maria Guadagno & Paola Revellino, 2022. "Calculating Economic Flood Damage through Microscale Risk Maps and Data Generalization: A Pilot Study in Southern Italy," Sustainability, MDPI, vol. 14(10), pages 1-21, May.
    2. Francesco Faccini & Fabio Luino & Guido Paliaga & Anna Roccati & Laura Turconi, 2021. "Flash Flood Events along the West Mediterranean Coasts: Inundations of Urbanized Areas Conditioned by Anthropic Impacts," Land, MDPI, vol. 10(6), pages 1-32, June.

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