Investigation of spatial and temporal variability of hydrological drought in Slovenia using the Standardised Streamflow Index (SSI)
ID Zalokar, Lenka (Author), ID Kobold, Mira (Author), ID Šraj, Mojca (Author)

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Drought is a complex phenomenon with high spatial and temporal variability. Water scarcity has become a growing problem in Slovenia in recent decades. Therefore, the spatial and temporal variability of hydrological drought was investigated in this study by analysing the Standardized Streamflow Index (SSI). Monthly discharge data series from 46 gauging stations for the period 1961–2016 were used to calculate SSI values at five different time scales (1, 3, 6, 12, and 24 months). The results indicate that the frequency and intensity of droughts in Slovenia has increased in recent decades at most of the analysed gauging stations and at all time scales considered. Spring and summer periods were identified as critical in terms of water deficit. SSI values vary independently from the location of the gauging station, confirming that drought is a regional phenomenon, even in a small country such as Slovenia. However, SSI values vary considerably depending on the time scale chosen. This was also confirmed by the results of the hierarchical clustering of the number of extreme droughts, as various time scales resulted in a different distribution of gauging stations by individual groups.

Keywords:hydrological drought, Standardised Streamflow Index, SSI, hierarchical clustering, seasonality
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:15 str.
Numbering:Vol. 13, iss. 22, art. 3197
PID:20.500.12556/RUL-133437 This link opens in a new window
ISSN on article:2073-4441
DOI:10.3390/w13223197 This link opens in a new window
COBISS.SI-ID:85603331 This link opens in a new window
Publication date in RUL:26.11.2021
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Record is a part of a journal

Shortened title:Water
COBISS.SI-ID:36731653 This link opens in a new window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:11.11.2021

Secondary language

Keywords:hidrološka suša, standardizirani indeks pretoka, SSI, hierarhično razvrščanje, sezonskost

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:P2-0180
Name:Vodarstvo in geotehnika: orodja in metode za analize in simulacije procesov ter razvoj tehnologij

Funder:Drugi - Drug financer ali več financerjev
Funding programme:UNESCO, IHP, Slovenian National Committee
Project number:C3330-20-456010

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