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Applications of innovative polygon trend analysis (IPTA) and trend polygon star concept (TPSC) methods for the variability of precipitation in Konya Closed Basin (Turkey)

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Abstract

Climate change–induced precipitation unpredictability has disastrous consequences for closed basins with sensitive hydrological equilibrium. Identifying changes and trends in precipitation characteristics in such catchments is an important step towards minimizing potential disasters. This study explores the precipitation variability of the Konya Closed Basin (Turkey), an over-exploited semi-arid basin. For this purpose, monthly precipitation data for the period 1971–2020 (50 years) of 11 meteorological observation gauges operated by the Turkish State Meteorological Service in the basin were utilized. Precipitation data were examined using two graphical innovative trend methods namely innovative polygon trend analysis (IPTA) and trend polygon star concept (TPSC) approaches. With these methods, periodic features in monthly precipitation data and trend transitions between months can be interpreted visually and linguistically. IPTA and TPSC methods were applied separately to both arithmetic mean data and standard deviation for each month’s precipitation data of 11 stations. A general increasing trend in precipitation was obtained in most of the months for the stations used in the IPTA application. Most of the TPSC arrows, which were distributed throughout all four regions for both the arithmetic mean and standard deviation, were in the I and III regions. Based on the TPSC graphs, the longest transition arrows between two consecutives occurred in the first months of autumn (highly increasing) and summer (highly decreasing) in most of the stations. The results of this study are of great importance for the policies to be sustained regarding the ongoing climate change in the agricultural sector in KCB, which is both a water scarce basin and a region with intensive agricultural activities.

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Acknowledgements

We would like to thank the Turkish State Meteorological Service for providing the precipitation data.

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Authors and Affiliations

  1. Department of Civil Engineering, Konya Technical University, Konya, Turkey

    Cihangir Koycegiz & Meral Buyukyildiz

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  1. Cihangir Koycegiz
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  2. Meral Buyukyildiz
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Contributions

C.K. Conceptualization, investigation, data collection and analysis, methodology, interpretation of the results, visualization, writing, and reviewing the whole content. M.B. Conceptualization, supervision, interpretation of the results, visualization, writing, and reviewing the whole content.

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Correspondence to Meral Buyukyildiz.

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Koycegiz, C., Buyukyildiz, M. Applications of innovative polygon trend analysis (IPTA) and trend polygon star concept (TPSC) methods for the variability of precipitation in Konya Closed Basin (Turkey). Theor Appl Climatol 155, 2641–2656 (2024). https://doi.org/10.1007/s00704-023-04765-x

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