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)
Autor: | Fabio Luino, Francesco Faccini, Andrea Mandarino |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Hydrology
geomorphic effectiveness G3180-9980 010504 meteorology & atmospheric sciences Flood myth Geomorphological mapping north-western italy Geography Planning and Development Land-use planning Hazard analysis 010502 geochemistry & geophysics 01 natural sciences alluvial gully Flood water floods Maps Earth and Planetary Sciences (miscellaneous) Environmental science River management orba river 0105 earth and related environmental sciences Floods geomorphological mapping Orba River north-western Italy |
Zdroj: | Journal of Maps, Vol 17, Iss 3, Pp 136-151 (2021) |
ISSN: | 1744-5647 |
Popis: | 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. |
Databáze: | OpenAIRE |
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