Akademik Veri Yönetim Sistemi
10TH INTERNATIONAL INNOVATIVE STUDIES & CONTEMPORARY SCIENTIFIC RESEARCH CONGRESS, Tokyo, Japonya, 1 - 03 Eylül 2025, ss.1-2, (Özet Bildiri)
Hydrological drought is a serious phenomenon affecting water resources
and their management. It is characterized by low surface and river flow levels
for long periods. In the current scientific literature, most studies have
focused on analyzing the effect of thresholds on meteorological drought using
indices such as the Standardized Precipitation Index (SPI). However, the impact
of these thresholds on hydrological drought using streamflow indices has not been sufficiently addressed. In this research,
the effect of different threshold values on hydrological drought
characteristics was investigated using runoff theory to identify drought events
and their characteristics, such as duration and intensity. The Streamflow
Drought Index (SDI) was applied to river flow data from a single station
located in the Konya Closed Basin of Türkiye using monthly data to achieve this.
Four different threshold levels
were analyzed: 0, -0.5, -1.0, and -1.5, representing
varying levels of drought severity. The results showed that the choice of
threshold significantly affects the characteristics of the extracted drought
events. Lower thresholds (0) increase the number of detected events, while
higher thresholds (-1.5) decrease the number of events and increase the average
severity and magnitude of the drought. This study provides a deeper
understanding of the role of thresholds in determining the characteristics of
hydrological drought and highlights the need to choose the appropriate
threshold according to the study objectives and the characteristics of the
water basin under investigation. It also highlights the importance of studying
hydrological drought independently of climatic drought, especially in seasonal
water basins or regions that rely heavily on river flows to meet their water
needs.