Seventh Symposium on the Urban Environment


A Comparison of Roughness Parameters for Oklahoma City from Different Evaluation Methods

Sam Chang, U.S. Army Research Laboratory, Adelphi, MD; and G. Huynh

The roughness parameters (displacement height, d, and momentum roughness length, Z0) are basic length scales for urban boundary layer flows. There are several methods to evaluate d and Z0 . Burian et. al. (2003) have used the morphological method to obtain d and Z0 values for Oklahoma City, Oklahoma. During the Joint Urban 2003 Field Experiment, a large amount of mean wind and turbulence data has been collected from the 83 m pseudo tower of Lawrence Livermore National Laboratory (LLNL). With the LLNL data we have used different methods, including the mean wind profile method and the temperature variance method to evaluate d and Z0 for Oklahoma City. A comparison of d and Z0 between different evaluation methods is presented. Also the advantages and limitations of these methods are discussed.

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Session 9, Urban Turbulence and Boundary Layers
Wednesday, 12 September 2007, 3:30 PM-5:00 PM, Kon Tiki Ballroom

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