Roughness length parameterisation in urban boundary layers
by Armando Pelliccioni; Paolo Monti; Giovanni Leuzzi
International Journal of Environment and Pollution (IJEP), Vol. 55, No. 1/2/3/4, 2014

Abstract: In an attempt to develop an improved model for the wind-speed profile valid for urban boundary layers, the role played by the roughness length z₀, i.e., the constant of integration of the vertical gradient of the wind speed, is extended. z₀ is assumed here as a 'dynamic' variable rather than as a 'geometric' parameter independent of the flow properties. On the basis of experiments conducted in a park located within the city of Rome and in the laboratory, it is found that in neutral conditions the 'vertical' profile of the roughness length shows a nearly exponential decrease with height.

Online publication date: Wed, 17-Dec-2014

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