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Journals / Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi / 2025 / Cilt: 27 Sayı: 2

Low flow analysis in the Seyhan Basin

Seyhan Havzası’nda düşük akımların analizi

Selman Baysal(ÇANAKKALE ONSEKİZ MART ÜNİVERSİTESİ)0000-0002-5917-3542
Selahattin Utku Yılmaz(İSTANBUL TEKNİK ÜNİVERSİTESİ)0000-0002-4789-6663
Furkan Sencer Kaçar(TÜRK-ALMAN ÜNİVERSİTESİ)0009-0000-1764-8207
Bihrat Önöz(IŞIK ÜNİVERSİTESİ)0000-0002-4531-2476
Pages
719–735
Publication Date
2025-07-15
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Based on these findings, it can be concluded that the flow rates measured at these stations have substantially decreased, suggesting a potential drought risk in the region.

📌 3 Key Takeaways

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Objective & Hypothesis:In this study low-flow analysis was conducted at various measurement stations within the Seyhan Basin.
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Key Findings & Data:Low-flow frequency analysis was performed to estimate the drought risks in the short, medium, and long term using annually-averaged minimum discharge values corresponding to durations of d = 1, 7, 10, and 15 days.
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Conclusion & Impact:Based on these findings, it can be concluded that the flow rates measured at these stations have substantially decreased, suggesting a potential drought risk in the region.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Seyhan Havzası · Düşük akım analizi · Kuraklık riski

Abstract

In this study low-flow analysis was conducted at various measurement stations within the Seyhan Basin. Low-flow frequency analysis was performed to estimate the drought risks in the short, medium, and long term using annually-averaged minimum discharge values corresponding to durations of d = 1, 7, 10, and 15 days. Low-flow estimates for different return periods were obtained using both two-parameter distributions, namely Log-Normal (LN2), Gamma (G2), Weibull (W2), Exponential (E2), Gumbel (GEV-I), and Logistic (L2), and three-parameter distributions, namely Generalized Extreme Value (GEV-III), Log-Normal (LN3),Pearson Type III (P3), Log-Pearson Type III (LP3), and Generalized Logistic (GL3). The goodness-of-fit between the various probability distributions and observed time series was investigated using the Kolmogorov-Smirnov (K–S) test. To observe trends in the low flows estimated by these distributions, various statistical tests were applied, including the Mann-Kendall (MK), Trend-Free Pre-Whitening (TFPW), and innovative trend analysis (ITA). The results obtained using measurements from six different stations indicate that the most accurate estimations for the Seyhan Basin were obtained using the P3, GEV-III, and LN3 distributions. At the designated significance level, a decreasing trend was observed at three stations. For the remaining stations where no statistically significant trend was identified, ITA tests revealed a negative trend. Based on these findings, it can be concluded that the flow rates measured at these stations have substantially decreased, suggesting a potential drought risk in the region.

Özet

Bu çalışmada Seyhan Havzası’nda yer alan istasyonlarda düşük akım analizi gerçekleştirilmiştir. Bu doğrultuda kısa, orta ve uzun vadeli kuraklık tespiti için d = 1, 7, 10 ve 15 günlük yıllık ortalama minimum debi değerleri kullanılarak düşük akım frekans analizi yapılmıştır. İki parametreli Log-Normal (LN2), Gamma (G2), Weibull (W2), Üstel (E2), Gumbel (GEV-I), Lojistik (L2) dağılımları ile üç parametreli GEV (GEV-III), Log-Normal (LN3), Pearson Tip III (P3), Log-Pearson Tip III (LP3) ve Genel Lojistik (GL3) dağılımları kullanılarak farklı dönüş aralıklarına sahip düşük akım tahminleri gerçekleştirilmiştir. Kolmogorov-Smirnov (K-S) uygunluk testi ile farklı istatistiksel dağılımların mevcut zaman serilerine uygunluğu tespit edilmiştir. Elde edilen düşük akımlardaki eğimin (trend) belirlenmesi için Mann-Kendall (MK), Trend-Free Pre-Whitening (TFPW) ve yenilikçi trend analizi (ITA) testleri uygulanmıştır. Çalışmada altı farklı istasyon ölçümleri kullanılarak elde edilen bulgular, Seyhan Havzası’nda en iyi tahminlerin LN2, P3, GEV-III ve LN3 dağılımları ile elde edildiğini göstermiştir. Seçilen anlamlılık düzeyinde üç istasyonda azalan trend bulunmuş olup, anlamlı bir trend tespit edilemeyen diğer istasyonlarda ITA testleri ile azalan bir eğilim belirlenmiştir. Elde edilen bulgular doğrultusunda, bu istasyonlarda özellikle son 10-15 yıllık süreçte ölçülen debilerin önemli miktarda azaldığı ve dolayısıyla küresel iklim değişikliği de göz önüne alındığında kuraklık riskinin olabileceği sonucuna ulaşılmıştır.

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Cite This Article

Baysal, S., Yılmaz, S. U., Kaçar, F. S., Önöz, B. (2025). Low flow analysis in the Seyhan Basin. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Cilt: 27 Sayı: 2, 719–735. https://doi.org/10.25092/baunfbed.1694675

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