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Meteorological and Agricultural Drought Risk Assessment via Kaplan–Meier Survivability Estimator

Author

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  • Cem Polat Cetinkaya

    (Department of Civil Engineering, Faculty of Engineering, Tinaztepe Campus, Dokuz Eylül University, Buca, Izmir 35220, Turkey)

  • Mert Can Gunacti

    (Department of Civil Engineering, Faculty of Engineering, Tinaztepe Campus, Dokuz Eylül University, Buca, Izmir 35220, Turkey)

Abstract

Dry periods and drought are inherent natural occurrences. However, due to the increasing pressures of global warming and climate change, these events have become more frequent and severe on a global scale. These phenomena can be traced with various indicators and related indices proposed by various scholars. In general, drought risk assessment is done by modeling these indicators and determining the drought occurrence probabilities. The proposed adaptation introduces the “Kaplan–Meier estimator”, a non-parametric statistic traditionally used in medical contexts to estimate survival functions from lifetime data. The study aims to apply this methodology to assess drought risk by treating past droughts as “events” and using drought indicators such as the Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI). Mapping these results for a better understanding of the drought risks on larger spatial scales such as a river basin is also within the expected outcomes. The adapted method provides the probability of non-occurrence, with inverted results indicating the likelihood of drought occurrence. As a case study, the method is applied to SPI and SPEI values at different time steps (3, 6, and 12 months) across 27 meteorological stations in the Gediz River Basin, located in Western Turkey—a region anticipated to be profoundly affected by global climate change. The results are represented as the generated drought risk maps and curves, which indicate that (i) drought risks increase as the considered period extends, (ii) drought risks decrease as the utilized indicator timescales increase, (iii) locally plotted drought curves indicate higher drought risks as their initial slope gets steeper. The method used enables the generation of historical evidence based spatially distributed drought risk maps, which expose more vulnerable areas within the river basin.

Suggested Citation

  • Cem Polat Cetinkaya & Mert Can Gunacti, 2024. "Meteorological and Agricultural Drought Risk Assessment via Kaplan–Meier Survivability Estimator," Agriculture, MDPI, vol. 14(3), pages 1-15, March.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:3:p:503-:d:1360531
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    References listed on IDEAS

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