CALCULATION OF A MASS-CONSISTENT 2-DIMENSIONAL WIND-FIELD WITH DIVERGENCE CONTROL

The aim of this paper is the calculation of mass-consistent wind veloc ity field in a two-dimensional domain Omega on the basis of sparse mea surements collected by wind-measuring stations. Measured data are used to estimate an initial field, The result is obtained by a weighted in terpolation method. An iterative scan procedure is used in which the r adius of influence of each station over the surrounding grid points is decreased at each step of iteration. To adjust the initial field into a mass-consistent velocity wind field, a new technique is presented t hat is meant to extract only the purely divergent component of the win d velocity field. This component is then either suitably manipulated, reduced and reintroduced in the total wind field, or completely neglec ted. The main idea of the method is to obtain a mass-consistent wind b y controlling the magnitude of the purely divergent component without completely destroying all the information connected with its spatial p attern, On the basis of a test case, the quality of the proposed metho d is assessed, and a good agreement with observations is found.