Prediction of suspended sediment load ͑SSL͒ is important for water resources quantity and quality studies. The SSL of a stream is generally determined by direct measurement of the suspended sediment concentration or by employing sediment rating curve method. Although direct measurement is the most reliable method, it is very expensive, time consuming, and, in many instances, problematic for inaccessible sections, especially during floods. On the other hand, measuring precipitation and flow discharge is relatively easier and hence, there are more rain and flow gauging stations than SSL gauging stations in Turkey. Furthermore, due to its cost, measurements of SSL are carried out in longer periods compared to precipitation and flow measurements. Although daily precipitation and flow measurements are available for most of the Turkish river basins, at best semimonthly measurements are available for SSL. As such, it is essential to predict SSL from precipitation and flow data and to fill the gap for the missing data records. This study employed artificial intelligence methods of artificial neural networks ͑ANN͒ and neurofuzzy inference system, the sediment rating curve method, multilinear regression, and multinonlinear regression methods for this purpose. The comparative analysis of the results showed that the artificial intelligence methods have superiority over the other methods for predicting semimonthly suspended sediment loads. The ANN using conjugate gradient optimization method showed the best performance among the proposed models. It also satisfactorily generated daily SSL data for the missing period record of Gediz River, Turkey.
Atmosferdeki sera gazı birikimlerinin artışına bağlı olarak iklim değişikliğinin, Türkiye'de neden olabileceği çevresel etkilerin en önemli sonuçları kuraklık ve taşkın olaylarının sıklığının ve şiddetinin artmasıdır. İklim değişikliği ile ilgili çalışmalar içerisinde sıcaklık parametreleri üzerinde yapılan analizler önemli bir yere sahiptir. Bu çalışmada, Orta Karadeniz Bölgesi kıyı şeridinde bulunan Sinop, Ordu ve Samsun illerinin sıcaklık verileri analiz edilmiştir. Kullanılan veri setleri Meteoroloji Genel Müdürlüğü'nden temin edilmiştir. Verilerin zaman içerisindeki değişimlerinin ortaya konulması için Mann-Kendall Trend Testi ve Sen'in Trend Eğim Testi uygulanmıştır. Sonuçlar, bölgede beklendiği gibi sıcaklığın genellikle artış trendine sahip olduğunu göstermiştir.
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