Akademik Veri Yönetim Sistemi
11th INTERNATIONAL EUROPEAN CONFERENCE ON INTERDISCIPLINARY SCIENTIFIC RESEARCH, Lisbon, Portekiz, 20 - 22 Ocak 2025, ss.251-252, (Özet Bildiri)
It is known that in many developing countries like Türkiye, the quality and quantity of measurement data required for comprehensive drought analyses at small, medium, and large scales are extremely limited. Also, it is essential that thirty-year data cannot be obtained in line with World Meteorological Organization (WMO) recommendations regarding drought management in most provinces and districts at medium and small scales. In this study, the usability of reanalysis data sources and observation data in drought studies was investigated for Kocaeli, which ranks seventh in terms of surface area and tenth in terms of total population in Türkiye. Drought calculations were carried out using the Standardized Precipitation Index (SPI) methodology for 3, 6, and 12-month timescales. When the long-term precipitation measurements made in 3397 km2 throughout the province are examined, it is seen that there are only one or two stations that can be used for analyses in line with WMO recommendations. Although there has been a significant increase in the number of automatic meteorological observation stations in the province after 2016, the duration of the records in question and their distribution throughout the province are insufficient to perform comprehensive drought analyses within the scope of drought management and adaptation to climate change. In recent years, reanalysis data has been used directly in hydrology, climate change, and drought studies in regions with a lack of data, problems in data supply, and data quality. In this study, the effect of the ERA-5 data source, which is the most used in the literature, on drought analyses, together with its similarities and differences, whether the use of the relevant data source in such analyses is reliable, and what should be done for the analyses were examined and evaluated. When the analysis results obtained from the data sources in question are compared with the observation time series, it is understood that there are significant differences and similarities. When the relevant metric results obtained are interpreted to compare the results and to reveal differences and similarities, it is understood that comprehensive studies are needed before the direct use of reanalysis data and that these studies should be carried out within the framework of a plan. As a result, it is understood that it is possible to use reanalysis data together with observation data for more detailed and reliable analysis of drought events at relatively small scales in the province and district, as in the example of Kocaeli province, and that planned and detailed research is needed for this, and that reanalysis products will become widespread much more rapidly in drought studies in the future.