Drought analysis of Black Sea Region by standardized precipitation index (SPI) and percent of normal index (PNI)

Abstract

Drought has become a critical problem for the whole world today. One of the main causes of drought is the decrease in precipitation regimes over time. In this study, the Black Sea Region was based on the annual total precipitation (mm) data between 1961-2019. Annual drought analysis was applied to 16 stations in the Black Sea Region with Standard Precipitation Index (SPI) and Percentage of Normal Index (PNI), which are two of the most used methods in drought analysis. As a result of the study, it was determined that the stations showed normal and above drought levels.