Numerical simulation of the effects of St. Louis on mesoscale boundary-layer airflow and vertical air motion: simulations of urban vs non-urban effects.

Abstract

Simulations are made for S, SW, W and NW winds, with urban uses replaced by rural land uses, both with and without topography. Simulations including urban effects indicated mesoscale upward air motion downwind of the city for all wind directions, strongest for SW winds and weakest for NW winds. With urban effects excluded, much weaker upward motion was found downwind for S, SW and W winds, and downward vertical velocities occurred in the downwind areas for NW winds.-Author