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Comparison of methodologies for flood rainfall thresholds estimation
Università Niccolò Cusano, Rome, Italy.
Sapienza University of Rome.
Sapienza University of Rome, Rome, Italy.
Sapienza University of Rome, Rome, Italy.ORCID iD: 0000-0002-4714-2511
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2015 (English)In: Natural Hazards, ISSN 0921-030X, E-ISSN 1573-0840, Vol. 75, no 1, p. 909-934Article in journal (Refereed) Published
Abstract [en]

A flood warning system based on rainfall thresholds makes it possible to issue alarms via an off-line approach. This technique is useful for mitigating the effects of flooding in small-to-medium-sized basins characterized by an extremely rapid response to rainfall. Rainfall threshold values specify the amount of precipitation that occurs over a given period of time and are dependent on both the amount of soil moisture and the spatiotemporal distribution of the rainfall. The precipitation generates a critical discharge in a particular river cross section. Exceeding these values can produce a critical situation in river sites that make them susceptible to flooding. In this work, we present a comparison of methodologies for estimating rainfall thresholds. Critical precipitation amounts are evaluated using empirical data, hydrological simulations and probabilistic methods. The study focuses on three small-to-medium-sized basins located in central Italy. For each catchment, historical data are first used to theoretically evaluate the empirical rainfall thresholds. Next, we calibrate a semi-distributed hydrological model that is validated using rain gauge and weather radar data. Critical rainfall depths over 30 min and 1, 3, 6, 12 and 24 h durations are then evaluated using the hydrological simulation. In the probabilistic approach, rainfall threshold values result from a minimization of two different functions, one following the Bayesian decision theory and the other following the informative entropy concept. In order to implement both functions, it is necessary to evaluate the joint probability function. The joint probability function is built up as a bivariate distribution of rainfall depth for a given duration with the corresponding flow peak value. Finally, in order to assess the performance of each methodology, we construct contingency tables to highlight the system performance.

Place, publisher, year, edition, pages
Springer Netherlands, 2015. Vol. 75, no 1, p. 909-934
National Category
Oceanography, Hydrology and Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:uu:diva-400996DOI: 10.1007/s11069-014-1357-3ISI: 000345971600042OAI: oai:DiVA.org:uu-400996DiVA, id: diva2:1382690
Available from: 2020-01-03 Created: 2020-01-03 Last updated: 2020-01-08Bibliographically approved

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Ridolfi, Elena

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