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Estimation of design floods using univariate and multivariate flood frequency approach with regard to one wet year
Bezak, Nejc (Author), Mikoš, Matjaž (Author)

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Abstract
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 (r6)
Tipology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2014
Publisher:Univerza v Ljubljani, Fakulteta za gradbeništvo in geodezijo
Number of pages:str. 103-117
Numbering:Letn. 27, št. 47
UDC:519.676:551.7.06
ISSN on article:1581-0267
COBISS.SI-ID:7409761 Link is opened in a new window
Views:620
Downloads:323
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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 This link opens in a new window

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

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