Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)

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...

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Autores principales:	Lenka Zalokar, Mira Kobold, Mojca Šraj
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hydrological drought Standardised Streamflow Index SSI hierarchical clustering seasonality Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/8896c79dfe524102aea653f42e57861a
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spelling	oai:doaj.org-article:8896c79dfe524102aea653f42e57861a2021-11-25T19:15:22ZInvestigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)10.3390/w132231972073-4441https://doaj.org/article/8896c79dfe524102aea653f42e57861a2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/22/3197https://doaj.org/toc/2073-4441Drought 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.Lenka ZalokarMira KoboldMojca ŠrajMDPI AGarticlehydrological droughtStandardised Streamflow IndexSSIhierarchical clusteringseasonalityHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3197, p 3197 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrological drought Standardised Streamflow Index SSI hierarchical clustering seasonality Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	hydrological drought Standardised Streamflow Index SSI hierarchical clustering seasonality Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Lenka Zalokar Mira Kobold Mojca Šraj Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)
description	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.
format	article
author	Lenka Zalokar Mira Kobold Mojca Šraj
author_facet	Lenka Zalokar Mira Kobold Mojca Šraj
author_sort	Lenka Zalokar
title	Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)
title_short	Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)
title_full	Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)
title_fullStr	Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)
title_full_unstemmed	Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)
title_sort	investigation of spatial and temporal variability of hydrological drought in slovenia using the standardised streamflow index (ssi)
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8896c79dfe524102aea653f42e57861a
work_keys_str_mv	AT lenkazalokar investigationofspatialandtemporalvariabilityofhydrologicaldroughtinsloveniausingthestandardisedstreamflowindexssi AT mirakobold investigationofspatialandtemporalvariabilityofhydrologicaldroughtinsloveniausingthestandardisedstreamflowindexssi AT mojcasraj investigationofspatialandtemporalvariabilityofhydrologicaldroughtinsloveniausingthestandardisedstreamflowindexssi
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Investigation of Spatial and Temporal Variability of Hydrological Drought in Slovenia Using the Standardised Streamflow Index (SSI)

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