Acerca del ángulo de influjo y su importancia en el desarrollo de los huracanes

Abstract

Results of experiments of a numerical hurricane model are presented in this work. The model is formulated in the σ (p/po) system, is balanced, and has four main and one frictional layers in the troposphere. The radial grid is non-uniform, having more resolutions near the center. The angle of inflow in the frictional layer is determined by the distribution of a reciprocal spiral in the central part and a criterion of the existence of divergence, in the rest of the frictional layer. The relationship between this formulation and the "classical" one, that uses the drag coefficient, is discussed and it is proved that the use of a given drag coefficient is equivalent to using a given angle of inflow. The angle of inflow has a distribution that gives a maximum value. Several values of this maximum were used on the model, and it is shown that a minimum of four degrees, for the value of the maximum angle, is necessary for development in the model. In an experiment by varying the maximum inflow angle value, a steady state was obtained, the different fields obtained after 90 hs of integration are presented and all seem quite realistic.