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Coping with Extreme Events: Effect of Different Reservoir Operation Strategies on Flood Inundation Maps
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. CNDS, Ctr Nat Hazards & Disaster Sci, S-75236 Uppsala, Sweden.ORCID iD: 0000-0002-4714-2511
Niccolo Cusano Univ, I-00166 Rome, Italy.
Ctr Funz Reg Umbria CFD, I-06034 Foligno, Italy.ORCID iD: 0000-0003-4570-4717
Ctr Funz Reg Umbria CFD, I-06034 Foligno, Italy.
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2019 (English)In: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 11, no 5, article id 982Article in journal (Refereed) Published
Abstract [en]

The need of addressing residual flood risk associated with structural protection measures, such as levee systems and flood-control reservoirs, has fostered actions aimed at increasing flood risk awareness. Structural measures have lowered risk perception by inducing a false sense of safety. As a result, these structures contribute to an underestimation of the residual risk. We analyze the effect of different reservoir operations, such as coping with drought versus coping with flood events, on flood inundation patterns. First, a hydrological model simulates different scenarios, which represent the dam regulation strategies. Each regulation strategy is the combination of an opening of the outlet gate and of the initial water level in the reservoir. Second, the corresponding outputs of the dam in terms of maximum discharge values are estimated. Then, in turn, each output of the dam is used as an upstream boundary condition of a hydraulic model used to simulate the flood propagation and the inundation processes in the river reach. The hydraulic model is thus used to determine the effect, in terms of inundated areas, of each dam regulation scenario. Finally, the ensemble of all flood inundation maps is built to define the areas more prone to be flooded. The test site is the Casanuova dam (Umbria, central Italy) which aims at: (i) mitigating floods occurring at the Chiascio River, one of the main tributaries of Tiber River, while (ii) providing water supply for irrigation. Because of these two competitive interests, the understanding of different scenarios generated by the dam operations offers an unique support to flood mitigation strategies. Results can lead to draw interesting remarks for a wide number of case studies.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 11, no 5, article id 982
Keywords [en]
flood risk, reservoir regulation, dam retention basin, residual risk, flood inundation map, extreme events
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:uu:diva-390535DOI: 10.3390/w11050982ISI: 000472680400112OAI: oai:DiVA.org:uu-390535DiVA, id: diva2:1342271
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-13Bibliographically approved

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