engleski

Drought and Precipitation Concentration Index (PCI) analysis in continental Croatia

Drought is an extreme hydrological event that causes great economic and environmental damages. There are various methods used for the identification and quantification of drought. Here will be presented Standardised Precipitation Index (SPI) which is the most common one for drought identification related to Precipitation Concentration Index (PCI). Precipitation Concentration Index is statistical parameter which can be very useful in identification of precipitation distribution. It can be applied on precipitation obtained on daily, monthly, seasonal or annual basis. It characterizes the monthly concentration of precipitation on a scale that ranges from less than 10 for evenly distributed rainfall to much higher values for extreme monthly rainfall distribution. Mapped values of the PCI provide a good visualization of relative precipitation distribution of a certain period. An unbalanced precipitation distribution indicates periods of drought or extensive rainfall. Study area of comparison Standardized Precipitation Index (SPI) and precipitation concentration index analysis is continental part of Croatia. Climate of this region is typical continental but in recent time , since middle eighties many researches confirmed changes in air temperature and precipitation regime, probably caused by climate change. The both indices are calculated for 14 meteorological stations, situated in 15 cities in continental part of Croatia in the period from 1981 to 2018. Analysis has been done on annual and seasonal basis in order to define variability in precipitation regime and its impact on drought episodes.

standardised precipitation index ; precipitation concentration index

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