Abstract

A numerical mesoscale model was used to simulate meteorological fields in the Lake Powell area during the summer, providing an input to a Lagrangian-type transport/dispersion model evaluation. The main objective of the study was to use these modeling tools in order to evaluate the local effect of thermally-induced circulations on large-scale transport of polluted air masses into that area. Results indicated a substantial modification of the transport characteristics due to the local terrain-forced circulations. Most noticeable are: (i) trapping of pollutants within the Lake Powell valley, (ii) upward and downward venting of pollutants in convergence/divergence zones associated with these circulations, and (iii) slowing of crossvalley transport as compared to equivalent situations involved with flat terrain.

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