Estimation of design floods using univariate and multivariate flood frequency approach with regard to one wet year

Bezak, Nejc (author), Mikoš, Matjaž (author)

The determination of design discharges and flood waves volumes is an important aspect of river engineering. The univariate annual maximum (AM), peaks-over-threshold (POT) and multivariate copula methods were used in this hydrologic study to investigate the impact of one wet year on the estimation of flood-related design variables. The flood frequency analyses (FFA) were performed using daily and hourly discharge data from three torrential streams in Slovenia where several flash floods occurred in the last decade. The results of the study indicate that the use of daily discharge data is inappropriate in case of torrential streams because the loss on information when compared to hourly hydrologic data is significant. The consideration of one wet year in the data sample has influence on the relationship between design variable and return period; however this influence is generally smaller than influence of the selected method to perform the FFA.

• Language: English
• Keywords: flood frequency analyses, annual maximums, peaks-over-threshold, copulas, climate change
• Work type: Not categorized
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: Univerza v Ljubljani, Fakulteta za gradbeništvo in geodezijo
• Year: 2014
• Number of pages: Str. 103-117
• Numbering: Letn. 27, št. 47
• PID: 20.500.12556/RUL-83427
• UDC: 519.676:551.7.06
• ISSN on article: 1581-0267
• COBISS.SI-ID: 7409761
• Publication date in RUL: 14.06.2016

BEZAK, Nejc and MIKOŠ, Matjaž, 2014, Estimation of design floods using univariate and multivariate flood frequency approach with regard to one wet year. Acta hydrotechnica [online]. 2014. Vol. 27, no. 47, p. 103–117. [Accessed 14 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=83427

Record is a part of a journal

• Title: Acta hydrotechnica
• Shortened title: Acta hydrotech.
• Publisher: Fakulteta za gradbeništvo in geodezijo
• ISSN: 1581-0267
• COBISS.SI-ID: 1838689

Secondary language

• Language: Slovenian
• Title: Ocena projektnih pretokov z uporabo univariatnih ter multivariatnih metod s poudarkom na vplivu nadpovprečno mokrega leta

Abstract

Določitev projektnih pretokov in poplavnih valov je pomemben korak pri načrtovanju hidrotehničnih objektov. Uporabili smo metodo letnih maksimumov (AM), metodo vrednosti nad izbranim pragom (POT) ter multivariatno metodo z uporabo funkcij kopula za določitev vpliva izrazito nadpovprečno mokrega leta na rezultate verjetnostnih analiz. Verjetnostne analize (FFA) so bile izvedene z uporabo podatkov o pretokih z urnim ter dnevnim časovnim korakom. Uporabljeni so bili podatki s treh hudourniških porečij v Sloveniji, kjer so se v preteklem desetletju zgodili številni ekstremni dogodki. Rezultati analiz so pokazali, da je uporaba podatkov z dnevnim časovnim korakom neprimerna za hudourniška območja, ker se veliko informacij o dejanskih konicah pretokov izgubi v primerjavi z urnimi podatki. Upoštevanje dodatnega nadpovprečno mokrega leta v analizah sicer ima vpliv na projektne pretoke, vendar je ta vpliv v večini primerov manjši kot vpliv izbire metode za izvedbo verjetnostnih analiz.

• Keywords: verjetnostne analize, metoda letnih maksimumov, metoda vrednosti nad izbranim pragom, kopule, klimatske spremembe