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Objective regional frequency analysis of extreme precipitation in Sicily, Italy

Lookup NU author(s): Angelo Forestieri, Dr Stephen Blenkinsop, Professor Hayley Fowler


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© 2015 Rainfall in Urban and Natural Systems - Proceedings of the 10th International Workshop on Precipitation in Urban Areas, UrbanRain 2015. All rights reserved.The extreme events have large impacts on society and are likely to increase under climate change. For design and management decisions, particularly around hydraulic infrastructures, accurate estimates of precipitation magnitudes are needed at different durations. In this paper, the regional frequency analysis has been implemented and applied to precipitation data recorded in Sicily, Italy. Annual maximum series for rainfall durations of 1, 3, 6, 12 and 24 h provided by about 130 rain gauges were used. The Regional Frequency Analysis (RFA) has been used to identify the homogeneous regions using Principal Component Analysis (PCA) followed by a clustering analysis, through k-means, aimed to identify regional groups. Two regional probability distributions have been used in order to derive the Depth-Duration Frequency (DDF) curves: lognormal distribution with three parameters (GNO) and generalized extreme value distribution (GEV). The regional parameters of these distributions were estimated using the L-moment ratios approach while the relative bias and relative RMSE have been calculated using a simulation study of regional L-moment algorithm for the assessment of the accuracy.

Publication metadata

Author(s): Forestieri A, Lo Conti F, Blenkinsop S, Noto LV, Fowler H

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Rainfall in Urban and Natural Systems: Proceedings of the 10th International Workshop on Precipitation in Urban Areas (UrbanRain 2015)

Year of Conference: 2015

Online publication date: 01/12/2015

Acceptance date: 01/01/1900

Publisher: ETH Zurich Research Collection