Browsing by Author "Debebe, Abera"

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    Simulation of the effect of random Geopotential height disturbance on air Flow on a barotropic atmosphere using Coarse resolution grid
    (2007-07) Debebe, Abera; Mengistu, Gizaw (PhD)
    The atmosphere is chaotic in nature and full of random processes. This random process affects the atmospheric field variables directly or indirectly. In this thesis, to identify the effect of random height disturbance, linearized shallow water equation is used as a model. The equation is solved numerically using finite difference method on nonstaggered Arakwan grid A. When the geopotential height is randomly disturbed, the initial distribution of the velocity field creates a wave of a standing type that consists of an enhanced and diminished pattern depending on the magnitude of the perturbation. However in the presence of mean flow, the perturbed system and the initial distribution of the field variables are carried away based on the direction of the mean flow