Yazar "Varcin, Hakan" seçeneğine göre listele

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  • [ N/A ]
    Öğe
    3-D Numerical Simulation of a Real Dam Reservoir: Thermal Stratified Flow
    (Springer-Verlag Singapore Pte Ltd, 2016) Unes, Fatih; Demirci, Mustafa; Varcin, Hakan
    [Abstract Not Available]
  • [ N/A ]
    Öğe
    Investigation of Plunging Depth and Density Currents in Egrekkaya Dam Reservoir
    (Turkish Chamber Civil Engineers, 2012) Unes, Fatih; Varcin, Hakan
    Fresh water sources are dwindling and becoming contaminated throughout the world due to environmental problems and fast growing population. Therefore, definition of reservoirs, reservoir flows, efficient use and proper modeling of fresh water sources gain great importance. In the real dam reservoirs, the density differences between inflow river water and ambient darn reservoir water create stratified flows. The density differences can be due to the discrepancies in temperatures, concentration of dissolved or suspended substances or a combination of both. In this study, a mathematical model is used for modeling reservoir flow and determining the plunging point and depth. The model consists of nonlinear and unsteady continuity, momentum, energy and k-epsilon turbulence model equations. The equations are constructed on actual dimensions, shape, boundary and initial conditions of the Egrekkaya dam. The model successfully simulates the formation of density currents and plunging flow. The results are found to be in accordance with the actual measured values. The results of this study are important with regard to sedimentation studies, water quality modeling and management and habitat assessment in reservoirs.
  • Küçük Resim
    Öğe
    Investigation of seasonal thermal flow in a real dam reservoir using 3-D numerical modeling
    (Veda, Slovak Acad Sciences, 2015) Unes, Fatih; Varcin, Hakan
    Investigations indicate that correct estimation of seasonal thermal stratification in a dam reservoir is very important for the dam reservoir water quality modeling and water management problems. The main aim of this study is to develop a hydrodynamics model of an actual dam reservoir in three dimensions for simulating a real dam reservoir flows for different seasons. The model is developed using nonlinear and unsteady continuity, momentum, energy and k-epsilon turbulence model equations. In order to include the Coriolis force effect on the flow in a dam reservoir, Coriolis force parameter is also added the model equations. Those equations are constructed using actual dimensions, shape, boundary and initial conditions of the dam and reservoir. Temperature profiles and flow visualizations are used to evaluate flow conditions in the reservoir. Reservoir flow's process and parameters are determined all over the reservoir. The mathematical model developed is capable of simulating the flow and thermal characteristics of the reservoir system for seasonal heat exchanges. Model simulations results obtained are compared with field measurements obtained from gauging stations for flows in different seasons. The results show a good agreement with the field measurements.