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Julia E. Flaherty, Brian Lamb, K. Jerry Allwine, and Eugene Allwine

indicate the locations of the tracer release points, while the triangular marker near the top of the figure represents the crane (vertical profile) site. This site was near the southwest corner of the intersection of 8th Street and Harvey Avenue. Other obstacles that are not depicted in Fig. 1 that had minimal effect on the measurements made at this crane site include several shipping containers and trailers located on the southern half of the block occupied by the crane measurement system. 3

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Donald A. Burrows, Eric A. Hendricks, Steve R. Diehl, and Robert Keith

corners of the grid. The simulations were initialized using the vertical wind profiles from the Argonne National Laboratory (ANL) minisodar, which was located near the southern edge of the grid (see Fig. 6 for location). For the nested-grid simulation, three grids with horizontally uniform grid cells of 45, 15, and 5 m were used ( Fig. 7 ). The area of coverage for the outermost grid was 3600 m × 3600 m × 300 m with the number of grid cells being 80 × 80 × 32. Grid dimensions in the vertical varied

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Stevens T. Chan and Martin J. Leach

well at the more southern tower in midblock and at the westernmost tower, where both the simulation and observation show very light wind speeds. The wind vectors do not agree well at the more northern midblock tower or at the tower near the east end of Park Avenue. The observations hint at the existence of a counterclockwise eddy in the eastern half of the block, whereas the simulation has such an eddy but it does not penetrate as far west in the urban canyon (see Fig. 10 ). Some of the

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M. A. Nelson, E. R. Pardyjak, J. C. Klewicki, S. U. Pol, and M. J. Brown

and -5 are further evidence of the buildings restricting turbulent motions. The along-canyon turbulence intensity dominated over the cross-canyon intensity on LANL3D-5, while the opposite is true for LANL3D-4. The western face of the building redirected the flow to be southerly at LANL3D-4 ( Figs. 1 and 5c ) and the southern face of the building forced the flow channel westerly along the canyon at LANL3D-5 ( Figs. 1 and 5a ). The high turbulence intensity measured on the ASU tower could be due

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