Yazar "Dursun Ö.F." seçeneğine göre listele

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    Investigation of seasonal changes of rainfall with trend analysis methods: The case of bingöl province
    (TUBITAK, 2021) Yükseler U.; Dursun Ö.F.; Alashan S.
    Many scientific studies have been carried out to examine the changes that occur and are likely to come in climates. These studies consist of statistical analysis of the changes in the past and estimating the changes that may occur in the future. Trend analysis methods have an important place among the forecast scenarios produced. In this study, the measured values between the years of 1960-2017, belonging to precipitation observation stations within the borders of Bingöl province, were analyzed by using Mann-Kendall (MK) and Şen innovative trend analysis (Şen-ITA) methods in annual and seasonal periods. The results showed that there were statistically significant decreasing trends in the total precipitation values of some stations on an annual scale. In terms of seasonal changes, it was observed that different tendency situations emerged between the locations of the stations and the seasons. In particular, the findings in the Şen-ITA method show significant changes in many total precipitation data. According to these findings, decreasing trends calculated between 0-2 mm/year in total annual precipitation were determined and these results were supported by Mann-Kendall test results. In addition, when the seasonal test findings are examined, it is determined that there is a seasonal transition in the values of some stations. © 2021, TUBITAK. All rights reserved.
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    Investigation of The Effects of Different Aerator Types on Venturi Aeration Performance by Using Numerical Models
    (TUBITAK, 2022) Cici İ.; Dursun Ö.F.
    There is a linear relationship between the quality of the water and the dissolved oxygen content. The life in motionless waters causes the amount of oxygen to decrease in time. Water can be cleaned from toxic gases and can be enriched oxygen content by using hydraulic structures. For this purpose, many studies have been done today. Venturi devices are used in many fields such as industry, agriculture, treatment plants and healthcare. In this study, aeration efficiency of venturies used in water aeration was investigated. For this purpose, the circular and elliptical geometries of the venturies are used. Different vent shafts are also designed on these venturi designs. For these designed venturi models, numerical analyzes were performed. In the study, a total of 240 numerical studies were performed with Ansys-Fluent software, which is a Computational Fluid Dynamics (HAD) software. The obtained results were interpreted by comparing them in terms of ventilation performance. © 2022, TUBITAK. All rights reserved.