Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/14205
Title: Interpolation between Businger-Dyer formulae and free convection forms: A revised approach
Authors: Akylas, Evangelos 
Tombrou, M. 
Major Field of Science: Engineering and Technology
Field Category: Civil Engineering
Keywords: Businger-Dyer formulae;Convective forms;Free convection;Monin-Obukhov theory
Issue Date: 3-Jun-2005
Source: Boundary-Layer Meteorology, 2005, vol. 115, no. 3, pp. 381-398
Volume: 115
Issue: 3
Start page: 381
End page: 398
Journal: Boundary-Layer Meteorology 
Abstract: In this study, profile functions for flux calculations during unstable conditions are proposed and examined. These functions are based on a direct interpolation for the dimensionless wind speed and temperature gradients between the standard Businger-Dyer formulae, φKu (ζ) = (1 - γuζ)-1/4, φKt(ζ) = (1 - γt ζ)-1/2, and free conviction forms, φCu,,t (ζ) = (1 - αCu,,tζ-1/3, ζ being the Monin-Obukhov stability parameter. A previously presented interpolation between the corresponding profile relationships, in attempting to provide a general relationship for the whole unstable regime, leads to serious restrictions for the values of αCu,,t in the free convection forms. These restrictions rendered available experimental data almost inapplicable, since the behaviour of the formulae in the near-neutral range controls the values of those parameters. The proposed interpolation provides functions that, firstly, fit the standard Businger-Dyer forms for near-neutral conditions and, secondly, satisfy the asymptotic behaviour as ζ → -∞, permitting wider ranges of possible αCu,,t values. This step is very important, taking into account the large spread of the experimental data. Thus, as further and more accurate observations at strong instability become available, this approach could prove very efficient in fitting these data while retaining correct near-neutral behaviour. © Springer 2005.
URI: https://hdl.handle.net/20.500.14279/14205
ISSN: 00068314
DOI: 10.1007/s10546-004-1426-3
Type: Article
Affiliation : National and Kapodistrian University of Athens 
National Observatory of Athens 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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