ABSTRACT
Air flow over complex topography is irregular with eddies and local flows created or modified by ridges and valleys. Air pollution deposits are to a great extent dependent on it. Therefore, we built a model to gain a quantitative description of the wind field. With the help of a diagnostic mesoscale model (variational, with geostrophic and mass consistency constraints) we calculated three-dimensional wind field for an alpine headwater with its prescribed topography and upper air flow. Properties of the air, air pollution and others, are carried and deposited according to wind velocity distribution. With the help of a simple pollution transport, dissipation and deposition model ground level pollution distributions were calculated. Results of the simulation explain the very large variability of air pollution deposits in the waterhead studied. Models of this kind can be very helpful in the analysis of air pollution deposit distribution in an irregular terrain and at planning of its monitoring.
