Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Nearshore Wave Prediction Modeling for the Southern-West Coasts of the Black Sea and Comparison With the Wave Measurement Data(Izmir Institute of Technology, 2019) Güler, Muzaffer; Özbahçeci, BergüzarWhile waves propagate towards shallow areas where most of the coastal structures are constructed, their properties like wave height and direction may change. The change in the wave properties in shallow areas called wave transformation may happen due to a decrease in water depth, sea bottom configurations or some obstacles like islands. Therefore, it should be calculated to find the wave properties used in coastal engineering projects. In this study, the main purpose is to model the waves in the near-shore region of the Filyos coast in Zonguldak province of Turkey by a 3rd generation nearshore wave model, SWAN (Simulating Waves Nearshore). The newest re-analysis data, ERA5, of The European Centre for Medium-Range Weather Forecasts (ECMWF) are used as SWAN model input in deep water. The data are calibrated with satellite radar altimeter data before using the model input data. One of the targets of the study is to verify the developed model using data of an in-situ measurement campaign organized by the Turkish Ministry of Transport. A verification study is performed using not only all data but also using the storm data with higher waves. For the selected storms, statistical and spectral analyses of the raw data are also performed. Results of the verification study show that wave predictions obtained from the developed nearshore wave model using SWAN fit to in-situ measurements well. Results are also compared with the previous studies and it is concluded that error results are much better for the wave period.Master Thesis Hydrodynamic Interaction in Rotational Flow(Izmir Institute of Technology, 2007) Çağatay, Filiz; Yılmaz, OğuzThe interaction of water waves with arrays of vertical cylinders problem is studied using diffraction of water waves and addition theorem for bessel functions. The linear boundary value problem which is derived from physical assumptions is used as the approximate mathematical model for time-harmonic waves. Linearization procedure is described for the nonlinear boundary conditions on the free surface. The problem is solved by using Addition theorem for Bessel functions. Limiting case, k 0, known as long wave approximation, is analysed using limiting forms of Bessel functions. Vortex-cylinder interaction is analyzed using a similar technique involving Laurent series expansions of complex velocity and the Circle Theorem. But this method failed to work. Further analysis is necessary. Vortex dynamics is analysed in annular domains, which can conformally be mapped into infinite domain with two cylinders, using the terminology of q-calculus. Finally, the result of vortex-cylinder interaction in annular domain is transformed into the infinite domain with two cylinders using conformal mapping. Image representation clearly shows the mechanism of inverse images which accumulate at zero and infinity in the w-plane and a and 1/a in the z-plane.