Comparison of Mann-Kendall and Sen’s innovative trend tests on measured monthly flows series of some streams in Euphrates-Tigris Basin

Öz

Low, medium and high values of a variable are a significant issue in hydrological, meteorological and climatological events; moreover, these values are used to decide various design parameters based on scientific aspects and real applications around the world. In this context, a new trend method recently proposed by Şen was used for monthly streamflow data recorded at two different stations (2174- Murat River (Akkonak) and 2634-Garzan Creek (Kozluk)) in Euphrates-Tigris Basin. The Mann-Kendall trend test was also applied to the same data. It was seen that the stations had statistically significant decreasing trend according to the Mann-Kendall and Şen trend test at 95% confidence level; moreover, the proposed method provided an important advantage in terms of graphically evaluation of low, medium and high values of streamflow data.

Anahtar Kelimeler

• Euphrates-Tigris Basin,Mann-Kendall,Streamflow,Şen’s trend test

Mann-Kendall ve Sen'in yeni eğilim testlerinin Fırat-Dicle Havzasındaki bazı akarsuların aylık akış serileri ile karşılaştırılması

Öz

Bir değişkenin düşük, orta ve yüksek değerleri hidrolojik, meteorolojik ve iklimsel olaylarda önemli bir konudur. Ayrıca, bu değerler dünyanın çeşitli yerlerindeki bilimsel yönlere ve gerçek uygulamalara dayanan çeşitli tasarım parametrelerini belirlemek için kullanılır. Bu bağlamda, Fırat-Dicle Havzasında iki farklı istasyonda (2174-Murat Nehri (Akkonak) ve 2634-Garzan Çayı (Kozluk)) kaydedilen aylık akarsu verileri için yakın zamanda Şen tarafından önerilen yeni bir eğilim yöntemi kullanılmıştır. Aynı verilere Mann-Kendall eğilim testi de uygulandı. İstasyonların, Mann-Kendall ve Şen eğilim testine göre istatistiksel olarak %95 güven düzeyinde önemli düşüş eğilimi gösterdİ.  Önerilen yöntem, akış akışı verisinin düşük, orta ve yüksek değerlerinin grafik olarak değerlendirilmesi açısından önemli bir avantaj sağladı.

Anahtar Kelimeler

• Fırat-Dicle Havzasu,Mann-Kendall,Akım,Şen’s trend test

Kaynakça

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