Numerical investigation of the effect of river meander on the dynamics of the atmospheric boundary layer

We report on a numerical study of diurnal cycle in the atmospheric boundary layer above a meandering river. The topography and the river shape are taken from the satellite data near Krasnoyarsk (Russia). Convective patterns developing during the early morning and the daytime lead to the formation of horizontal circulation and the jet-like flow across the river at the point of maximum curvature of the meander. This effect may play an important role in the transport of atmospheric pollutants in urban environment. During the flow evolution, formation of some coherent large-scale vertices is observed. The observed pattern can appear in many similar conditions in nature.