Jan Cunja (Author), Mira Kobold (Author), Mojca Šraj (Author)

Abstract

Analiza obsega primerjavo volumnov in trajanj primanjkljajev odtoka pri različnih izbirah sušnega praga za vodomerne postaje Polana na reki Ledava, Litija na reki Savi in Kubed na reki Rižani z različnimi podnebnimi pogoji za hidrološko najbolj suha leta obdobja 1960-2016 v Sloveniji. Pri metodi praga za sušne dogodke označimo vse dogodke, pri katerih pretoki padejo pod vnaprej izbrano vrednost praga. Za prag smo izbrali tri različne vrednosti, in sicer srednji mali obdobni pretok sQnp ter percentila krivulje trajanja Q90 in Q80. Za vsako vodomerno postajo smo med posameznimi sušnimi dogodki določenega leta pri različnih izbirah praga izbrali dogodek z največjim volumnom primanjkljaja in njegovo trajanje ter skupni letni volumen primanjkljajev in skupno trajanje sušnih dogodkov za posamezno leto. Rezultati raziskave so pokazali, da ima izbira sušnega praga lahko velik vpliv na rezultate analiz primanjkljaja odtoka. Pri višjih vrednostih praga se absolutne vrednosti trajanja in volumnov primanjkljajev povečajo. Poleg tega se pri spreminjanju vrednosti praga spremenijo tudi razmerja med rezultati posameznih let. Ne glede na izbiro praga se je po vseh štirih izbranih sušnih karakteristikah leto 2003 izkazalo kot najbolj sušno za vse tri obravnavane vodomerne postaje, sledijo mu leta 1993, 1971 in 2012. Je pa suša specifičen pojav regionalnega značaja in se različno odraža po posameznih regijah Slovenije.

Keywords

hidrološka suša;primanjkljaj odtoka;metoda praga;Slovenija;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
UDC: 551.577.38+556.18(497.4)
COBISS: 50767107 Link will open in a new window
ISSN: 0352-3551
Views: 248
Downloads: 83
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Other data

Secondary language: English
Secondary title: Analysis of runoff deficit using the treshold method for the case of three gauging stations in Slovenia
Secondary abstract: This analysis deals with the comparison of volume and duration of runoff deficits using different drought thresholds for the gauging stations Polana on the Ledava, Litija on the Sava, and Kubed on the Rižana Rivers with different climatic conditions for the hydrologically driest years in the period 1960-2016 in Slovenia. Using the threshold method, all events in which discharge fell below a pre-selected threshold value were identified as drought events. Three different values were chosen for the threshold value, namely the mean low periodic discharge sQnp and the percentiles of flow duration curve Q90 and Q80. For each gauging station, the event with the largest deficit volume and duration, as well as the total annual deficit volume and the total duration of drought events for the individual year, were selected using different threshold values. The studys results demonstrate that the choice of drought threshold can have a great impact on the results of runoff deficit analyses. The absolute values of the duration and volume of the runoff deficits increase with higher threshold values. Also the ratios between the results of the individual years change slightly when the threshold value changes. Regardless of the choice of the threshold, 2003 proved to be the driest year according to all four selected drought characteristics and for all three analysed gauging stations, followed by 1993, 1971, and 2012, respectively. However, drought is a specific phenomenon of a regional character and is reflected differently in the different regions of Slovenia.
Secondary keywords: hydrology;hydrological drought;runoff deficit;treshold method;Slovenia;
Type (COBISS): Scientific work
Pages: str. 113-127
Volume: 33
Issue: ǂ[št.] ǂ59
Chronology: 2020
ID: 12553462