Title: Validation of Gaussian plume model Aeropol against Cabauw field experiment

Authors: Marko Kaasik; Gertie Geertsema; Rinus Scheele

Addresses: Institute of Physics, University of Tartu, Tartu, Estonia ' Royal Netherlands Meteorological Institute, P.O. Box 201, Utrechtseweg 297, De Bilt, Netherlands ' Royal Netherlands Meteorological Institute, P.O. Box 201, Utrechtseweg 297, De Bilt, Netherlands

Abstract: The Gaussian dispersion model AEROPOL is validated against the Cabauw (1977-1978) dataset, applying the parameters and rules from the Model Validation Kit. The purpose to revisit this experiment is preparation for fast response to buoyant accidental releases. In the AEROPOL model, the classical Pasquill-Gifford stability and a scheme based on Lagrangian time scales (the Gryning scheme) are used as alternatives. Validation is based on correlation, fractional bias, fractional sigma, NMSE and fraction in factor 2, applying these statistics to maximal arc-wise, near-centreline and cross-wind integrated concentrations. Both parameterisations are found to be fairly adequate. The Gryning scheme results in moderately underestimated concentrations, which are well correlated with the experimental ones. The Pasquill parameterisation, in contrast, represents the concentrations well on average, but with larger scatter. The average wind direction and speed between the lowest measurement level and release level are found to be good approximations to represent the position of the Gaussian plume.

Keywords: Gaussian plume; dispersion experiment; Cabauw; AEROPOL; HARMONIE; Model Validation Kit.

DOI: 10.1504/IJEP.2017.089420

International Journal of Environment and Pollution, 2017 Vol.62 No.2/3/4, pp.369 - 384

Received: 22 Aug 2016
Accepted: 29 May 2017
Published online: 23 Jan 2018 *

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