Akademik Veri Yönetim Sistemi
12th Global Conference on Global Warming , Şanlıurfa, Türkiye, 16 - 19 Mayıs 2024, sa.195, ss.572-575
Drought is a complex natural
phenomenon with far-reaching impacts on various sectors, including agriculture,
water resources, and the environment. Assessing and monitoring droughts is
crucial for effective management and mitigation efforts. Drought indices play a
pivotal role in quantifying and characterizing drought events, providing
valuable insights into their severity, duration, and intensity. This research
aims to temporally evaluate drought using the Standardized Precipitation Index
(SPI) at a 12-month timescale, focusing on the Kadıköy station's monthly
precipitation data from 1951 to 2020. The primary objective is to explore the
differences in drought characteristics, including intensity, duration, and
severity, by employing different thresholds based on run theory. By applying
thresholds of 0, -0.5, and -1.0, variations in the number of drought events,
duration, and intensity are analyzed and compared. The findings reveal that
lower thresholds correspond to fewer drought events due to the more stringent
criteria for defining drought conditions. Additionally, the study identifies
durations of 42 months, 37 months, and 35 months for thresholds of 0, -0.5, and
-1.0, respectively, indicating a consistent trend of decreasing duration with
decreasing thresholds. Notably, utilizing the widely adopted threshold of 0
yields a maximum intensity of -1.8, whereas employing a threshold of -1.0
results in a substantially higher maximum intensity of -2.09. These findings
underscore the critical role of threshold selection in drought characterization
and highlight the importance of considering various thresholds in drought
studies and management strategies.