Abstract
Irregular precipitation regimes have important effects on the increase in the incidence and severity of meteorological disasters, the use of water resources, the decrease in the variety and amount of agricultural products, and on biodiversity. Therefore, investigating the temporal and spatial variations of precipitation is vital important in the future planning and management both water resources and of agricultural activities. In this study, it is aimed to investigate annual and seasonal time scales the spatial variability and temporal trends of concentration, seasonality and aggressiveness of precipitation in Seyhan Basin (Turkey), which has different topography and climate characteristics. For this purpose, nonparametric indices such as the Precipitation Concentration Index (PCI), Seasonality Index (SI) and Modified Fournier Index (MFI) were used. To calculate these indices, monthly precipitation data of 7 stations for the period 1970–2019 were used. While monotonic trends in the PCI, SI and MFI series were analyzed using the classical Mann–Kendall test, sub-trends were examined using Onyutha's test, which is an innovative method. The presence of monotonic and sub-trends was evaluated at the 5% significance level. Analyses performed on both annual and seasonal scales showed that generally higher index values were obtained at stations in the south of the basin and lower indices values were obtained in other parts of the basin. The results of MK and Onyutha trend tests applied to annual total precipitation and PCI, SI and MFI values are similar. In general, insignificant positive trends were determined in the annual total precipitation and index values at the stations in the south of the basin, while insignificant negative trends were determined in the other regions.
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We would like to thank the Turkish State Meteorological Service for providing the precipitation data.
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All authors contributed to the study conception and design. Investigation, data collection and visualization were performed by C. Koycegiz. Methodology, analyses, interpretation of the results, writing, and reviewed the whole content were done by C. Koycegiz and M. Buyukyildiz. Supervision of the work was done by M. Buyukyildiz. All authors read and approved the final manuscript.
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Koycegiz, C., Buyukyildiz, M. Investigation of spatiotemporal variability of some precipitation indices in Seyhan Basin, Turkey: monotonic and sub-trend analysis. Nat Hazards 116, 2211–2244 (2023). https://doi.org/10.1007/s11069-022-05761-6
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DOI: https://doi.org/10.1007/s11069-022-05761-6