Akademik Veri Yönetim Sistemi
V-INTERNATIONAL BAKU CONFERENCE ON SCIENTIFIC RESEARCH, Baku, Azerbaycan, 11 Aralık 2024, ss.1-2
In drought monitoring and evaluation
conditions, there are some discussions related to classical drought definitions
in using drought indices, which are frequently preferred in the literature. The
first is selecting the threshold level for the onset of drought. In the studies
conducted, it is seen that Run and SPI theories are frequently taken as
references, and two different threshold levels are considered in these
methodologies. For meteorological, agricultural, and
hydrological droughts, the drought events in question are not fully compatible
and consistent, and sometimes even opposite situations that do not support each
other emerge. The main reason is the differences in drought definitions and
models used in assessing relevant drought conditions. This research aims to
discuss the differences between meteorological-agricultural,
agricultural-hydrological, and meteorological-hydrological droughts originating
from drought definitions. In this context, Manavgat station in the Antalya
basin, one of the most susceptible basins to drought in Türkiye, was selected
as the application area. The drought results of the Standardized Precipitation
Index (SPI), one of the most widely used indices in the literature, between
1969-2022, 3, 6, and 12-month time scales were examined and interpreted. In the
evaluation of the results of the analysis, innovative drought classification
matrices (IDCM) were used. As a result of the analysis, limited agricultural
and meteorological drought events were encountered in some processes where
long-term hydrological drought events were experienced for both drought
definitions. Also, It is observed that there are results in
which meteorological drought is not encountered in periods when agricultural
drought events occur. Run theory is more consistent in evaluating
hydrological-meteorological and hydrological-agricultural drought events than
SPI theory. These results, on the one hand, show the importance of the
constraints related to definition and assumptions in terms of monitoring and
evaluation of meteorological, agricultural, and hydrological drought
conditions, and they raise the question of the need to develop a single common
model in the definition and monitoring of meteorological, agricultural and
hydrological drought conditions.