Wind Direction Dependence of Atmospheric Boundary Layer Turbulence Parameters in the Urban Roughness Sublayer

A variety of atmospheric boundary layer parameters are examined as a function of wind direction in both urban and suburban settings in Oklahoma City, Oklahoma, derived from measurements during the Joint Urban 2003 field campaign. Heterogeneous surface characteristics result in significant difference...

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Bibliographic Details
Published in:Journal of applied meteorology (1988) 2007-12, Vol.46 (12), p.2086-2097
Main Author: Klipp, Cheryl
Format: Article
Language:English
Subjects:
Atmospheric boundary layer
Atmospheric turbulence
Boundary layers
Central business districts
Chemical spills
Drag coefficient
Fluid dynamics
Hazardous materials
Kinetic energy
Meteorology
Meteors
Metropolitan areas
Obstructions
Quadrants
Roughness
Scale models
Street trees
Suburban environments
Towers
Trees
Turbulence
Turbulent flow
Urban areas
Wind
Wind direction
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Summary:A variety of atmospheric boundary layer parameters are examined as a function of wind direction in both urban and suburban settings in Oklahoma City, Oklahoma, derived from measurements during the Joint Urban 2003 field campaign. Heterogeneous surface characteristics result in significant differences in upwind fetch and, therefore, statistically significant differences in measured values, even for small changes in wind direction. Taller upwind obstructions yield larger measured values of drag coefficient and turbulence intensity than do shorter upwind obstructions regardless of whether the obstruction is a building or a tree. The fraction of turbulent kinetic energy going into streamwise, cross-stream, and vertical variances differs depending on the upwind fetch, and reduced cross-stream values may indicate locations of persistent wind stream convergence. In addition, a quadrant analysis of burst/sweep behavior near the surface is examined as a function of wind direction in urban and suburban environments.
ISSN:1558-8424
0894-8763
1558-8432
1520-0450
DOI:10.1175/2006JAMC1298.1