Drought Investigation Using SPI and SPEI Methods: A Case Study in Kırıkkale

Year 2022, Volume: 14 Issue: 2, 762 - 776, 31.07.2022

Gaye Aktürk , Utku Zeybekoğlu , Osman Yıldız

https://doi.org/10.29137/umagd.1100886

Cited By: 5

Abstract

Drought is one of the most important natural disasters with various social and environmental effects. Therefore, it is very important to choose a particularly suitable index for monitoring drought. Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) are widely used in drought monitoring. In this study, drought analysis was carried out using SPI and SPEI methods in order to examine the development and characteristics of drought in the city of Kırıkkale, which has semi-arid characteristics. SPI and SPEI values were calculated on 1, 3, 6, 9 and 12-month time scales by using monthly precipitation and temperature data from Kırıkkale meteorology station between 1963 and 2018. While calculating the potential evapotranspiration (PET) values in the SPEI calculation, Thornthwaite and Hargreaves models were used and two different SPEI values were obtained. As a result, high correlation values were obtained between all indices in the same time scale. It has been concluded that SPI and SPEI methods are applicable in the detection and monitoring of drought in the study area.

Keywords

Drought, SPI, SPEI, Thornthwaite Method, Hargreaves Method

SPI ve SPEI Yöntemleri ile Kuraklık Araştırması: Kırıkkale Örneği

Abstract

Kuraklık, çeşitli sosyal ve çevresel etkileri olan en önemli doğal afetlerden biridir. Bu nedenle, kuraklığı izlemek için özellikle uygun bir indeks seçmek çok önemlidir. Standartlaştırılmış Yağış İndisi (SPI) ve Standartlaştırılmış Yağış Evapotranspirasyon İndisi (SPEI) kuraklık izlemede yaygın olarak kullanılmaktadır. Bu çalışmada, yarı kurak özelliklere sahip Kırıkkale ilinde kuraklığın gelişimini ve özelliklerini incelemek amacıyla SPI ve SPEI yöntemleri kullanılarak kuraklık analizi yapılmıştır. Kırıkkale meteoroloji istasyonundan 1963-2018 yılları arasında aylık yağış ve sıcaklık verileri kullanılarak 1, 3, 6, 9 ve 12 aylık zaman ölçeklerinde SPI ve SPEI değerleri hesaplanmıştır. SPEI hesaplamasında potansiyel evapotranspirasyon (PET) değerleri hesaplanırken Thornthwaite ve Hargreaves modelleri kullanılmış ve iki farklı SPEI değeri elde edilmiştir. Sonuç olarak aynı zaman ölçeğinde tüm endeksler arasında yüksek korelasyon değerleri elde edilmiştir. SPI ve SPEI yöntemlerinin çalışma alanında kuraklığın tespiti ve izlenmesinde uygulanabilir olduğu sonucuna varılmıştır

Keywords

Kuraklık, SPI, SPEI, Thorntwaite Yöntemi, Hargreaves Yöntemi

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