Yazar "Aslan, Z" seçeneğine göre listele

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    Finite differences method for shallow water equations in a class of discontinuous functions
    (Elsevier Science Inc, 2005) Rasulov, M; Aslan, Z; Pakdil, O
    In this study a finite difference method for solving initial boundary value problem for the one-dimensional nonlinear system of differential equations describing shallow water flows in a class of discontinuous functions is suggested. In order to find the numerical solution of the problem, known as main problem, a special auxiliary problem is introduced. The degree of smoothness of the solution of the auxiliary problem is higher than the smoothness of the solution of the main problem. Moreover, the suggested auxiliary problem makes it possible to write out the effective and higher order numerical algorithms. Some results of numerical experiments are demonstrated. (C) 2003 Elsevier Inc. All rights reserved.
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    One-dimensional wavelet and reanalysis of gravity waves
    (Springer Heidelberg, 2004) Can, Z; Aslan, Z; Oguz, O
    Different meteorological parameters and atmospheric circulations are known as one of the sources of excitement of gravity waves (GWs). The main purpose of this paper is to analyze the GWs and seasonal variations over Istanbul by wavelet-based computer simulations. Turbulent structures of pressure, height, and air temperature have been analyzed in this paper. These waves are in the meso-scale wave-form and, generally, are observed in spring, autumn, and winter. The FAWAV Wavelet software and the latest version of MATLAB wavelet packet are applied to analyze meteorological parameters for the north-western part of Turkey. Wavelet based computer simulation of data is generally close to the real data under consideration for the Daubechies wavelet series.
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    The variations of temperature, pressure and wind speed values: Effects on gravity waves
    (Editrice Compositori Bologna, 2002) Can, Z; Aslan, Z; Oguz, O
    According to the theoretical studies, gravity waves, which are excited in the lower atmosphere, can transport momentum and energy on to the upper levels. Gravity waves are attenuated by interacting with the large-scale wind motions in the upper part of the middle atmosphere. Different meteorological parameters and atmospheric circulations are known as one of the sources of excitement of gravity waves. The main purpose of this paper is to analyze the onset of some gravity waves (GWs), and seasonal variations of gravity waves over Istanbul. Radiosonda data of Istanbul in troposphere and lower stratosphere (1000 hPa-30 hPa) between 1993 and 1997 is analyzed. Daily, monthly and annual variation of pressure heights, air temperature, horizontal wind speed and deviations, from mean values are interpreted. Zonal and meridional wind speed variations show the effects of gravity waves for different pressure levels in the troposphere. These waves lead the meso-scale waveform structures in spring, autumn and winter.