Title: Roughness length parameterisation in urban boundary layers

Authors: Armando Pelliccioni; Paolo Monti; Giovanni Leuzzi

Addresses: INAIL-DIPIA, Via Fontana Candida 1, 00040, Monteporzio Catone, Roma, Italy ' DICEA, Sapienza University of Rome, via Eudossiana 18, 00184, Italy ' DICEA, Sapienza University of Rome, via Eudossiana 18, 00184, Italy

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.

Keywords: Monin-Obukhov similarity theory; MOST; urban boundary layers; canopy layer; buildings; displacement height; inertial sublayer; ISL; urban heat islands; roughness length; CEDVAL; modelling; wind speed profile; aerodynamic roughness; Rome; Italy; dispersion modelling.

DOI: 10.1504/IJEP.2014.065900

International Journal of Environment and Pollution, 2014 Vol.55 No.1/2/3/4, pp.13 - 21

Published online: 17 Dec 2014 *

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