Akademik Veri Yönetim Sistemi
EURO ASIA 12.INTERNATIONAL CONGRESS ON APPLIED SCIENCES, Mingachevir, Azerbaycan, 17 - 18 Şubat 2025, ss.463, (Özet Bildiri)
Based on the standard precipitation index (SPI), drought characteristics, including drought duration, magnitude, and intensity, can be calculated for different cut-off levels in drought event definition. Determining drought characteristics and defining their relationships is extremely important in terms of meteorological, agricultural, ecological, and hydrological studies. Differences between drought event definitions bring conceptual discussions to the forefront in solving drought-related problems. According to the acceptances from research to research, one of the frequently discussed issues in the literature is defining the cut-off level at which drought begins. The determined cut-off level affects drought characteristics. When the studies are examined, it is known that two cut-off levels accepted in SPI and Run methods are generally prominent. Still, different cut-off levels are also used in research occasionally. In this study, the relationships between drought duration and drought magnitudes (magnitude) for three different data sources (observation, ERA 5 Land, and IMERG NASA) close to each other in Kocaeli province will be examined for different cut-off levels, and the critical cut-off level will be determined in terms of drought events and characteristics. Since the drought intensity is calculated depending on these two drought characteristics, the section level at which the critical drought severity occurs is also given at the end of the research. As a result of the analysis, it is seen that the critical section level in terms of drought events varies according to the duration of the drought. Another result is that the drought characteristics differ from one level to another level. The research reveals the importance of making calculations according to different section levels for evaluating critical drought conditions and characteristics and risk management.