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Advances in Geosciences An open-access journal for refereed proceedings and special publications

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Adv. Geosci., 44, 15-22, 2017
https://doi.org/10.5194/adgeo-44-15-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
24 Feb 2017
Combining regional rainfall frequency analysis and rainfall-runoff modelling to derive frequency distributions of peak flows in ungauged basins: a proposal for Sicily region (Italy)
Brunella Bonaccorso, Giuseppina Brigandì, and Giuseppe Tito Aronica Department of Engineering, University of Messina, Villaggio S. Agata, Messina, 98166, Italy
Abstract. In the present study an attempt is made to provide a general Monte Carlo approach for deriving flood frequency curves in ungauged basins in Sicily region (Italy). The proposed procedure consists of (i) a regional frequency analysis of extreme rainfall series, combined with Huff curves-based synthetic hyetographs, for design storms and (ii) a rainfall-runoff model, based on the Time-Area technique, to generate synthetic hydrographs. Validation of the procedure is carried out on four gauged river basins in Sicily region (Italy), where synthetic peak flow frequency curves, obtained by simulating 1000 flood events, are compared with observed values. Results of the application reveal that the proposed Monte Carlo approach is suitable to reproduce with reasonable accuracy the hydrologic response of the investigated basins. Given its relative simplicity, the developed procedure can be easily extended to poorly gauged or ungauged basins.

Citation: Bonaccorso, B., Brigandì, G., and Aronica, G. T.: Combining regional rainfall frequency analysis and rainfall-runoff modelling to derive frequency distributions of peak flows in ungauged basins: a proposal for Sicily region (Italy), Adv. Geosci., 44, 15-22, https://doi.org/10.5194/adgeo-44-15-2017, 2017.
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A Monte Carlo approach for deriving flood frequency curves in ungauged basins in Sicily region (Italy) is proposed. The procedure consists of: (i) a regional frequency analysis of extreme rainfall series, combined with Huff curves-based synthetic hyetographs, for design storms and (ii) a rainfall-runoff model, based on the Time-Area technique, to generate synthetic hydrographs. Validation of the procedure is carried out on four gauged river basins in Sicily (Italy) with promising results.
A Monte Carlo approach for deriving flood frequency curves in ungauged basins in Sicily region...
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