Regional frequency analysis of extreme precipitation in northeastern Algeria

• Autorzy: Dad S. , Benabdesselam T.

Identyfikatory

DOI

10.2478/jwld-2018-0056

Warianty tytułu

PL

Analiza częstotliwości ekstremalnych opadów w regionie północno-wschodniej Algierii

• Języki publikacji: EN

Abstrakty

EN

The aim of the study is to improve the quality of estimating of the annual maximum daily precipitations of the northeastern area of Algeria. The regional frequency analysis based on L-moments was used. The investigated area is represented by 58 measuring stations. The main stages of the study were the definition of homogeneous regions and the identification of the regional distribution. It has been defined that the study region is homogeneous in terms of L-moments ratios despite the climatic differences within the region. Among the different tested distributions; the generalised extreme value (GEV) distribution has been identified as the most appropriate regional distribution for modelling precipitation in the region. The growth curve, derived from the regional distribution, was established. Therefore, to estimate the different return period’s precipitation quantiles in a given site of the region, the mean precipitation of the site has to be multiplied by the corresponding regional quantile (growth factor). Comparison of the quantiles estimated from the regional and at-site frequency analysis showed that in the majority of stations (82.8%) at-site model underestimates the quantiles having high return periods.

PL

Celem pracy była poprawa jakości ocen maksymalnego w ciągu roku dobowego opadu na obszarze północno-wschodniej Algierii. Wykorzystano statystykę L-momentów do analizy częstotliwości regionalnej. Badany obszar jest reprezentowany przez 58 stacji pomiarowych. Głównymi etapami badania było zdefiniowanie regionów homogenicznych i identyfikacja rozkładu regionalnego. Stwierdzono, że badany region jest homogeniczny w znaczeniu proporcji momentów L, mimo różnic klimatycznych w obrębie regionu. Spośród testowanych rozkładów najbardziej odpowiedni do modelowania opadu w regionie okazał się uogólniony rozkład wartości ekstremalnych (GEV). Ustalono krzywą wzrostu wyprowadzoną z rozkładu regionalnego. Aby oszacować kwantyle okresów powtarzalności opadów dla danego stanowiska w regionie, średni opad w tym stanowisku należy pomnożyć przez odpowiedni kwantyl regionalny (czynnik wzrostu). Porównanie analizy częstotliwości w odniesieniu do regionu i stanowiska wykazało, że w większości stacji (82,8%) model stanowiskowy obniża wyniki oszacowania kwantyli o długim okresie powtarzalności.

Słowa kluczowe

EN

extreme daily precipitation; GEV distribution; homogeneous regions; L-moments; regional frequency analysis

PL

analiza regionalnej częstotliwości; ekstremalne opady dobowe; momenty L; regiony homogeniczne; rozkład GEV

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2018
• Tom: no. 39
• Strony: 27--37
• Opis fizyczny: Bibliogr. 24 poz., rys., tab.

Twórcy

autor

Dad S.

• Badji Mokhtar University, Soil and Hydraulics Laboratory, Annaba, Algeria

autor

Benabdesselam T.

• Badji Mokhtar University, Department of Hydraulics, BP 12, 23000 Annaba, Algeria

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