A study of the effect of obstructions the submeso flow in the convective boundary layer

The equations built over the years in the study of planetary boundary layer, although often based on experimental level, were created to idealized situations like, homogeneous surfaces flat, free from obstacles and steady state conditions. However such homogeneity situation is far from reality, because the earth’s surface features a large variability in topography, ground cover and urban areas. This paper presents a proposal to show the influence of the variability of the local surface as the obstacle effect on the flow in the timescale still small known, the Submeso in Convective Boundary Layer. To prove this effect was found a Transmission Factor for each wind sector in the eight micrometeorological stations present in the experimental site of Pedras Altas in the Pampa region in the state of Rio Grande do Sul. Such Transmission Factor confirm the local influence of obstacles in filtering flow enabling identification of which quadrant the wind is more or less obstructed and even check in climbing time to osbtrucao exerts greater impact.