Article

Assessment of meteorological and hydrological droughts in the eastern Slovakia using SPI and SSI indices

Martina ZeleňákováTashkent Institute of Irrigation and Agricultural Mechanization Engineers, Tashkent, UzbekistanHany Abd ElhamidTechnical University of Košice, Kosice, SlovakiaTatiana SoľákováTechnical University of Košice, Kosice, SlovakiaPavol PurczTechnical University of Košice, Kosice, SlovakiaCarlo De MichelePolitecnico di Milano, Milan, ItalyPeter BlišťanTechnical University of Košice, Kosice, SlovakiaHelena HlavatáSlovak Hydrometeorological Institute, Bratislava, SlovakiaDorota SimonováSlovak Hydrometeorological Institute, Bratislava, SlovakiaMaría Manuela PortelaUniversity of Lisbon, Lisbon, Portugal

Modeling Earth Systems and Environmentjournal2025en

ABI

Abstract

Abstract This study assesses two drought indices; the Standardized Precipitation Index (SPI) and the Standardized Stream flow Index (SSI) at 12-month time scale. The major drought variables including: duration, severity and intensity were estimated. The indices are calculated by a parametric approach, which means the probability distribution is estimated for each month separately. The distributions are selected based on the Akaike Information Criterion and the EasyFit software. The parameters estimation was made using the maximum likelihood method. The joint behavior of drought characteristics and their long-term evolution in year was analyzed by the concept of Copula in the eastern part of Slovakia. Finally, the likelihood of moderate drought risk through joint return periods was evaluated.

Topics

Hydrology and Drought Analysis Climate variability and models Hydrology and Watershed Management Studies

Identifiers

DOI: 10.1007/s40808-025-02423-x

Citations and references

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