Regional parent flood frequency distributions in Europe – Part 2: Climate and scale controls

Jose Luis Salinas, Attilio Castellarin, Silvia Kohnova, Thomas Kjeldsen

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
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Abstract

This study aims to better understand the effect of catchment scale and climate on the statistical properties of regional flood frequency distributions. A database of L-moment ratios of annual maximum series (AMS) of peak discharges from Austria, Italy and Slovakia, involving a total of 813 catchments with more than 25 yr of record length is presented, together with mean annual precipitation (MAP) and basin area as catchment descriptors surrogates of climate and scale controls. A purely data-based investigation performed on the database shows that the generalized extreme value (GEV) distribution provides a better representation of the averaged sample L-moment ratios compared to the other distributions considered, for catchments with medium to higher values of MAP independently of catchment area, while the three-parameter lognormal distribution is probably a more appropriate choice for drier (lower MAP) intermediate-sized catchments, which presented higher skewness values. Sample L-moment ratios do not follow systematically any of the theoretical two-parameter distributions. In particular, the averaged values of L-coefficient of skewness (L-Cs) are always larger than Gumbel's fixed L-Cs. The results presented in this paper contribute to the progress in defining a set of "process-driven" pan-European flood frequency distributions and to assess possible effects of environmental change on its properties.
Original languageEnglish
Pages (from-to)4391-4401
JournalHydrology and Earth Systems Science
Volume18
Early online date5 Nov 2014
DOIs
Publication statusPublished - 5 Nov 2014

Keywords

  • flood
  • Europe

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