Yazar "Ozan, Ayse Yuksel" seçeneğine göre listele

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    Öğe
    Flow Characteristics in the Wake Region of a Finite-Length Vegetation Patch in a Partly Vegetated Channel
    (Mdpi, 2018) Yilmazer, Didem; Ozan, Ayse Yuksel; Cihan, Kubilay
    Aquatic vegetation in rivers and coastal regions controls the flow structure in terms of mean velocity and turbulence. The vegetation in the flow affects the transportation of nutrients, microbes, dissolved oxygen, sediment, and contaminants; therefore, the flow characteristics of different types of vegetation layers should be examined in order to understand the effects of vegetation on the flow structure. In this paper, the effect of the submergence ratio and SVF (Solid Volume of Fraction) of a vegetation patch, which was present across half of the channel in a spanwise direction, on the flow structure at the wake region was examined. For this purpose, different submergence ratios with different SVFs were considered in the experiments, and velocity measurements were performed in the wake region of the vegetation layer with an Acoustic Doppler Velocimeter (ADV). According to the results, the effect of different vegetation heights and SVFs on the velocity distribution was obtained. Moreover, inflectional velocity distribution over the cross-section in the wake region of the vegetation layer was obtained, and it was concluded that jet flow occurred in the non-vegetated half of the channel due to the vegetation layer.
  • [ X ]
    Öğe
    Tam batmış bitki tarlasının açık kanal akım hızlarına etkisinin flow-3d ile modellenmesi
    (2022) Yilmazer, Didem; Ayna, Gökhan; Ozan, Ayse Yuksel; Cihan, Kubilay
    Bu çalışmada, deneysel olarak yapılan tam batmış bitkilerin açık kanal akımlarına olan etkisinin incelendiği bir çalışma, FLOW-3D ile modellenmiştir. Deney sonuçları ve sayısal model sonuçları karşılaştırılmıştır. Modellemede Yılmazer ve ark. [10] tarafından gerçekleştirilen deneye ait veriler kullanılmıştır.
  • [ X ]
    Öğe
    Unconfined propeller jet scour on clay/sand mixtures
    (Pergamon-Elsevier Science Ltd, 2022) Cihan, Kubilay; Dog, Ali; Yilmaz, Damla; Ozan, Ayse Yuksel; Yildiz, Osman; Sahin, Cihan
    In this study, scour due to an unconfined propeller water jet on homogeneous clay-sand mixtures was investigated experimentally. A total of 9 tests were conducted for the sand bed and 18 tests were carried out for the sand-clay mixture bed. Since clay contents (p) of 0, 5 and 10% by weight were used in the experiments, scour in poorly cohesive sand-clay mixture bed was taken into account. Propeller diameters (Dp) were 0.06 and 0.09 m. Dimensionless propeller heights (y0/Dp) were defined as 1.67, 1.11, 1.0. The increase in clay content causes a decrease in the scour depth and changes the formation of scour profiles. The parameters y0/Dp, F0 (densimetric Froude number), p were found to have significant effects on the behavior of clay-sand mixtures. Considering the test results, equations were proposed to estimate the maximum depth and length of the scour hole formed in the equilibrium condition. In addition, by modifying the equation proposed by Hong et al. (2013), a new equation is proposed for the estimation of temporal maximum scour depth due to the propeller water jet on the sand and weakly cohesive sand-clay mixture beds.